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Still here after 15 years
Founded 2011 or earlier and still running. Survival is a fact; hype is not.
185 teardownsEvery teardownFortressesEasy to copy. Won anyway.Built on rented landNumbers straight from a filingDoesn't scale. On purpose.Still here after 15 yearsOne-time money
Vinted
Marketplace
Europe's clothes resale. Buyers pay, sellers don't.
€1.1B
Stated · $1.2B · 2025 revenue, +38% YoY
Most revenue is one fee buyers love to hate.
★ The edge: Taxes buyers, not sellers. Free listing grows supply, supply grows demand — liquidity fee-charging rivals can't match.
Open →
China Literature
Community
Readers pay by the chapter. Tencent films the hits.
$1.13B
Stated · FY24 group revenue (0772)
Free, ad-funded rivals erode the paywall.
★ The edge: It pioneered pay-per-chapter reading in 2003, then kept the rights and became China's biggest web-fiction IP owner.
Open →
Avalara
SaaS
Sales tax on autopilot for 13,000+ US jurisdictions.
$1B+
Stated · 2023, founder-stated
Stripe Tax bundles the core calc cheaply.
★ The edge: IPO'd days before the 2018 Wayfair ruling forced millions of online sellers into multi-state sales-tax filing.
Open →
Zerodha
Marketplace
India's biggest stock broker, built on zero ad spend
$1B
Stated · FY24 rev, 55%+ margin
Most revenue is retail F&O; SEBI now curbs it.
★ The edge: A flat fee per order plus free equity delivery undercut percentage brokers; options volume at scale yields 55% margins.
Open →
Shutterstock
Marketplace
He shot 30,000 photos to seed an empty marketplace.
$935M
Filed · revenue (FY2024)
AI image generators undercut paid stock.
★ The edge: Buyers pay flat monthly subscriptions; contributors get a royalty. Shutterstock keeps the spread on stock it never shot.
Open →
Workiva
SaaS
A mandate forced XBRL filings. They owned the tool.
$884.6M
Filed · FY2025 revenue · public
⚠ Scale: heavy sales
GAAP-loss years
GAAP-loss years
★ The edge: The SEC didn't allow XBRL filings — it required them, making every public company a forced buyer.
Open →
Vertex
SaaS
Every US sales-tax rate, current since 1978.
$748.4M
Stated · FY2025 revenue, +12% YoY
Growth slowing; SMB edge lost to Avalara.
★ The edge: Tax rates change constantly across 195+ countries; Vertex has kept a 1B+ rule database current since 1978.
Open →
SafeSend
SaaS
They ignored the tax return. They sold the last mile.
$600M
Filed · all-cash exit price, 2025
Sits downstream of engines it doesn't own.
★ The edge: Eight years selling paperless tools inside tax firms told them exactly which 30 minutes to automate in 2016.
Open →
Doximity
Community
Over 80% of US doctors are members. Pharma pays.
$570.4M
Filed · FY2025 revenue, up 20%
Leans on pharma marketing budgets
★ The edge: Founder Jeff Tangney built Epocrates first, so he already had physician trust and knew pharma pays to reach doctors
Open →
BizReach
Marketplace
Japan had no way to poach talent. BizReach built one.
¥68.6B/yr
Filed · $460M · BizReach net sales, FY25/7
One country, one white-collar hiring cycle.
★ The edge: Both sides pay — seekers to be scouted, firms to scout — at 90%-plus gross margins, in a market agencies used to own.
Open →
Follow Up Boss
SaaS
The CRM every real-estate team runs their leads through.
$400M+
Stated · Zillow buyout, 2023
Owned by Zillow now — is it still neutral?
★ The edge: The neutral hub: it ingests leads from Zillow and its rivals alike, so every team needs it.
Open →
Karooooo (Cartrack)
SaaS
Vehicle tracking that prints where US giants won't go
$335M ARR
Estimate · ARR run-rate (Q1 FY27)
Hardware install caps SaaS-style margins.
★ The edge: Owns the device, software, install network and data, and runs it profitably, so it undercuts VC-funded rivals.
Open →
Poshmark
Marketplace
She sells her closet; Poshmark keeps 20% of every sale.
$326M
Filed · FY2021 net revenue
Never profitable; heavy marketing spend.
★ The edge: Feeds, follows and Posh Parties turn one-time resale into a social habit; buyer retention topped 104%.
Open →
Idealista
Marketplace
Spain's #1 property portal. Agents pay, buyers browse.
€300M+
Stated · $325M · 2024 revenue, +16% YoY
Liquidity is local; each market restarts.
★ The edge: It out-executed same-era rival Fotocasa on listing quality and trust — now valued about 20x higher.
Open →
HealthStream
SaaS
Rules force the training. It bills for it every year.
$304.1M
Filed · FY2025 revenue (10-K)
Growth is slow: about 4% a year.
★ The edge: Accreditors, OSHA and CMS require the training; HealthStream is where US hospitals buy and log it.
Open →
Sansan
Data
Japan runs on business cards. Sansan digitized them.
$280M
Stated · ARR, May 2025 (¥41.5B)
The card ritual fades as work goes remote.
★ The edge: Rivals trust OCR; Sansan runs every card through human operators too — 99.9% accuracy is the data moat.
Open →
ThredUp
Marketplace
Free closets in, 80% gross margins out.
$260.0M
Filed · 2024 revenue (net)
Still net-loss-making after 15 years.
★ The edge: Distribution centers that photograph, price and ship 230M+ one-off used items — logistics P2P rivals refuse to build.
Open →
Envato
Marketplace
The bootstrapped stock-asset market that paid out $1.3B
$245M
Stated · 2024 sale price, announced
Its subscription now cannibalizes its authors
★ The edge: Launched the marketplace, then built Tuts+ — the web's biggest design-tutorial network — to feed it buyers.
Open →
Weave
SaaS
The dentist's office phone, now a public NYSE SaaS.
$239M
Filed · FY2025 net revenue
Never profitable; retention under 100%.
★ The edge: The most boring wedge won: replace the dentist's phone, tie each call to the patient chart, impossible to rip out.
Open →
Craneware
SaaS
Sells 4 in 10 US hospitals their billing-rule software.
$205.7m
Filed · revenue, yr to Jun 2025
Finite TAM; about 40% already installed.
★ The edge: They wrote the first automated hospital chargemaster in 1999; US billing rules keep about 40% of hospitals renewing.
Open →
Toptal
Marketplace
The top 3% of freelance talent, sold at a premium.
$200M+/yr
Estimate · Revenue, self-reported '21
Big markup underpays talent; they can defect.
★ The edge: Instead of maximizing supply like Upwork, Toptal rejects 97% of applicants and sells scarcity at a premium.
Open →
Auction Technology Group
Marketplace
$3.3bn of goods sold. ATG keeps $190m.
$190.2m
Filed · FY25 revenue, audited
GMV tracks cyclical art and surplus spend.
★ The edge: Owns the bidding rails thousands of auction houses depend on, and the bidder demand they can't aggregate alone.
Open →
Weedmaps
Marketplace
The ad platform for an industry Google won't touch.
$184.5M
Filed · FY2024 revenue (10-K)
Revenue has fallen two years straight.
★ The edge: Cannabis sellers are banned from Google, Meta and Yelp ads, so Weedmaps became the one place buyers and sellers meet.
Open →
IndiaMART
Marketplace
India's B2B directory where only sellers pay
$165M
Stated · FY25 rev · listed (BSE)
Paying base flat; growth from price hikes.
★ The edge: Only sellers pay: 217K of 7M+ suppliers fund the whole marketplace while 200M+ buyers browse free.
Open →
Pushpay
SaaS
Digital tithing for US megachurches, built in NZ.
US$202.8M
Filed · FY22 revenue, up 13%
US churches only — a finite, capped market.
★ The edge: Owns the church software and the payment rails, so it earns a margin on every dollar of US$7.6B given yearly.
Open →
Hemnet
Marketplace
Sweden's default home portal. Sellers foot the bill.
SEK 1,394.6M
Filed · 2024 net sales · +39% YoY
One country, one housing cycle.
★ The edge: Brokers built it in 1998 and fed it every listing. Private equity later bought control and made the sellers pay.
Open →
Just Dial
Marketplace
India found local shops by phone before it had Google.
Rs 1,141.9 cr
Estimate · about $130M · FY25 revenue from ops
Google Maps is eating local discovery.
★ The edge: A decade of door-to-door sales onboarded 50M+ Indian businesses before broadband arrived — a base no crawler can copy.
Open →
Catawiki
Marketplace
Curated auctions where experts vet every lot
€105M
Stated · 2024 revenue (about $114M)
Experts scale linearly; margins stay thin.
★ The edge: Paid experts vet every lot, so buyers trust it enough to pay a 21.5% combined take in a market full of fakes.
Open →
Chrono24
Marketplace
Global marketplace for pre-owned luxury watches.
€103.2M
Stated · FY2021 group accounts
Dealers could bypass; GMV swings with prices.
★ The edge: Free built-in escrow lets strangers wire $50K for a used watch across 150 countries without fear of fakes.
Open →
Bengo4.com
Community
A lawyer's Q&A site now sells Japan's top e-signature.
¥16.3B
Filed · about $109M · FY3/2026 net sales (filed)
One country, one law. It travels nowhere.
★ The edge: Motoe is a lawyer. CloudSign was the first witness-type e-signature Japan's Ministry of Justice recognized.
Open →
Chess.com
Community
A $55K domain became a $100M+ chess business, no VC.
$100M+
Estimate · annual revenue (2024)
Demand swings with chess-culture fads.
★ The edge: The generic domain chess.com is where new players land by default. Rivals buy the attention it gets free.
Open →
SafetyCulture
SaaS
Turned the mandatory safety audit into an app.
$100M+
Stated · annual revenue, 2021
Low moat vs generic form/checklist apps
★ The edge: Ten years filming workplace injuries as a PI gave Anear buyer access and hazard know-how no app-first rival had.
Open →
WebPT
SaaS
A PT built the software her whole field learned from.
$100M+
Estimate · revenue, press-stated
One vertical; a UX-led rival is taking share.
★ The edge: An insider PT made WebPT the rehab profession's teacher (blog + Ascend summit), so clinics arrived before any ad ran.
Open →
Twinkl
SaaS
Sells teachers the worksheets they made at 10pm.
£78.6M
Filed · about $98M · turnover, FY to Apr 2024
Free AI can draft a worksheet in seconds.
★ The edge: It industrialised unpaid evening work: salaried teachers turn every curriculum change into ready-made resources.
Open →
PowerOffice
SaaS
Accountants do the selling. It bills per invoice.
NOK 925M
Filed · about $96M · FY2025 revenue, filed
Norway only; Visma now owns it.
★ The edge: Accounting firms put clients on it, so partners do the selling — and every invoice meters the bill.
Open →
Infomedia
Data
Carmakers endorse it, their dealers pay for it.
A$146.5M
Filed · FY25 revenue · pre-buyout
Tied entirely to the automotive industry.
★ The edge: Microcat is the maker-endorsed parts catalog dealers update monthly and rely on across 186 countries.
Open →
Signicat
SaaS
The single plug into every eID banks must use.
NOK 1B+
Stated · about $95M · 2023 turnover (company)
It resells national eIDs it doesn't own.
★ The edge: Europe's eID schemes are fragmented and national; Signicat integrated 35+ into one API regulated firms onboard through.
Open →
Swappa
Marketplace
The used-electronics market without the scams
$92M
Stated · seller proceeds (GMV)
Scale Low capped
★ The edge: Free to list, so supply floods in; buyer and seller each pay about 3% on a sale for what used tech lacks: trust.
Open →
1stDibs
Marketplace
Where designers buy five-figure furniture online.
$89.6M
Filed · 2025 net revenue
Rare, cyclical buys cap repeat and growth.
★ The edge: Invite-only curation plus authentication let strangers trust five-figure buys that open marketplaces can't safely host.
Open →
FreeTaxUSA
SaaS
Filing is the law. They gave away the federal part.
82M+
Stated · tax returns filed with IRS
One season; Direct File died, politics shift.
★ The edge: Bootstrapped 2001; low cost lets federal stay free forever. 82M+ returns = trust rivals buy with ads.
Open →
AppSumo
Marketplace
Sells software lifetime deals to a 1.5M-buyer list.
$80M
Stated · 2023 revenue
One-time cash, no recurring revenue.
★ The edge: The product is distribution, not deals: a 1.5M-buyer list makers hand 70-80% of a Select deal to reach.
Open →
Pagero
SaaS
E-invoicing network riding a wave of tax mandates.
$75M
Stated · 2023 net sales · $800M exit
⚠ Control: rules shift
loss-making land-grab
loss-making land-grab
★ The edge: They pre-built compliance across dozens of countries, so every new e-invoice mandate lands as ready-made demand.
Open →
GeoComply
SaaS
US law makes every online bet prove your location.
$56M
Estimate · est. revenue (Latka, 2025)
Tied to gambling law it does not control.
★ The edge: US betting law requires a geolocation check on every bet, and GeoComply runs it for nearly every major operator.
Open →
BharatMatrimony
Marketplace
India's paid matchmaker, one caste at a time
$55M
Filed · FY25 rev, NSE-listed
Young urban India is leaving for dating apps
★ The edge: Paid matchmaking: brides and grooms subscribe to contact verified matches, split across 300+ caste and language sites.
Open →
Komoot
SaaS
Europe's outdoor map, grown to 45M users, then sold.
$54M
Estimate · 2024 revenue, reported
Goodwill, not lock-in, was the only moat.
★ The edge: User-contributed 'Highlights' make its trail routing beat any pure-map rival — a 15-year community data moat.
Open →
MapmyIndia
Data
India's map data, built on foot before Google arrived.
₹474 cr
Stated · $54M · FY26 rev. from ops · stated
Growth stalled: 2.3% in FY26.
★ The edge: Thirty years of proprietary India map data — 6.29M km of roads, 17.8M places — licensed to firms that build the apps.
Open →
Supermetrics
SaaS
Marketing data pulled into the sheet you already use.
€50M+ ARR
Estimate · about $52M · 2022, bootstrapped origin
Google can build the connectors natively.
★ The edge: First to connect Google's API to a spreadsheet, then let Google's own add-on store sell it. No sales team.
Open →
GunBroker
Marketplace
The gun auction site that sells nothing itself
$51.1M
Filed · FY26 revenue (marketplace)
Revenue still sits below its FY22 peak.
★ The edge: Every online gun sale must end at a licensed dealer. GunBroker wired 32,000 of them in and bills the sale.
Open →
Admicom
SaaS
The ERP he sold to Visma, rebuilt for Finnish builders
€37.7M
Filed · about $43M · 2025 revenue, Nasdaq filed
Grows 6% a year. One industry, one country.
★ The edge: Sells only to Finnish construction and building-services firms — then keeps their books and payroll too.
Open →
BUYMA
Marketplace
A crowd abroad shops luxury for you — guaranteed real.
¥6.3B
Filed · about $41M · Net revenue, FY Jan 2026
Discretionary luxury; weak yen bites GMV.
★ The edge: No inventory, no imports: 244k personal shoppers abroad are the supply, and BUYMA underwrites every sale as authentic.
Open →
Flightradar24
Data
The crowd built the network. 36 staff sell the view.
SEK 418.8M
Filed · about $41M · FY24 revenue (filed)
The signal is public. It owns no data.
★ The edge: ADS-B is a free radio signal any hobbyist can catch. FR24 spent 18 years turning scattered listeners into one network.
Open →
AudioEye
SaaS
ADA-lawsuit insurance, delivered as a script tag.
$40.3M
Stated · FY2025 revenue, +15% YoY
Its demand engine (lawsuits) can turn on it.
★ The edge: Courts manufacture the demand: thousands of ADA web suits a year scare SMBs into buying compliance they can't judge.
Open →
OzBargain
Ad
Australia's deal hive — the crowd posts, ads pay.
40M+
Stated · page views/month
Scale mid AU-only ceiling
★ The edge: The crowd writes every deal for free; OzBargain just owns the hive and rents attention to advertisers.
Open →
Devolutions
SaaS
A free tool for one IT pro; paid PAM for the whole team.
C$50M/yr
Estimate · $36M · 2025 ARR, bootstrapped
Moving upmarket into CyberArk's turf.
★ The edge: The free solo edition seeds 800k desktops worldwide; teams then pay for shared credentials, servers and PAM.
Open →
Freelancer.com
Marketplace
He didn't build the marketplace. He bought his rivals.
A$55.3M
Filed · FY25 revenue, audited
Freelance revenue grew 0.7% in FY25.
★ The edge: Takes a cut from both sides, 10% from the worker and 3% from the client, then sells upgrades on top.
Open →
Cookpad
Community
Millions of free recipes. Pay to find the best.
¥5.3B
Filed · $35M · FY2025 sales (TSE-filed)
Premium members keep leaving; revenue halved.
★ The edge: 6M+ user recipes, 100M+ monthly users, 25 years of habit — a UGC library rivals can't clone.
Open →
QuestionPro
SaaS
Bootstrapped a survey tool to $35M by buying rivals
$35M run rate
Stated · revenue run rate (2023)
Commoditized market, heavy price pressure.
★ The edge: Profitable 21 years, never raised. Grows by buying small survey companies at about 2x revenue.
Open →
Wantedly
Marketplace
Hiring by mission, not resume — flat monthly fee.
$33M/yr
Filed · Op. revenue, FY25 (listed)
Japan-only; casual-visit hiring is local.
★ The edge: A flat monthly subscription where agencies take 30-35% of first-year salary — cheap enough for cash-poor startups.
Open →
Atera
SaaS
Flat fee per tech, unlimited devices. MSPs switched.
$32.7M
Estimate · est. ARR (Latka, 2024)
Per-seat pricing caps revenue per account.
★ The edge: Rivals bill per endpoint; cost grows with a client's devices. Atera bills per technician - margin holds as you scale.
Open →
LCPtracker
SaaS
Free for contractors. The agency the law forces pays.
$31M ARR
Estimate · 2024, from $1M in 11
US-only law; grows one slow agency at a time.
★ The edge: Gave the app free to contractors and billed the agency - the party the law forces to collect payroll weekly.
Open →
OpenWork
Data
Japan's Glassdoor: 21M reviews, sold to recruiters.
¥4,653M
Estimate · $31M · FY2025 op. revenue, +31%
Japanese-only; hard to scale abroad.
★ The edge: Free reviews are bait; the real product is 8M job-seekers, sold to employers as pay-on-hire scouting.
Open →
Tebex
Marketplace
Let game servers sell in-game perks — for a 5% cut.
$29M
Estimate · sale to Overwolf (2022)
⚠ Control Low
rides games it can't own
rides games it can't own
★ The edge: he lived the pain as a server kid, then became the default payment rail before rivals showed up.
Open →
Metrc
SaaS
The system 20+ states force on cannabis sellers.
$28.4M/yr
Stated · CA contract only, 1 of 23
Every dollar rides on renewable state deals.
★ The edge: A state mandates Metrc; every licensed cannabis operator must then pay in to stay legal. The regulator is the moat.
Open →
BIS Safety Software
SaaS
Boring safety software. 99% of customers never leave.
$25M CAD/yr
Stated · founder-stated ARR, 2025
Labor-heavy; one vertical, mostly Canada.
★ The edge: Leaving BIS means re-certifying your whole crew — so under 1% churn. Half of new customers come by referral, not ads.
Open →
Clear (ClearTax)
SaaS
India made GST filing the law. Clear became the rails.
$25M
Stated · FY24 rev, +93% YoY
Govt's free portal can commoditize filing.
★ The edge: When a govt forces millions to file taxes digitally, whoever ships the easiest compliant rails becomes default plumbing.
Open →
Hatena
SaaS
18 manga publishers rent their reader from Kyoto.
¥3,794M
Filed · $23M · FY2025, TSE-filed accounts
One wire fraud cost 5x annual net profit.
★ The edge: Sells the viewer, never the manga. Shueisha, Kodansha and Shogakukan all ship on Hatena's platform, IP untouched.
Open →
Intellicheck
SaaS
The law put a barcode on every ID. They read it.
$22.67M
Filed · FY2025 revenue (10-K)
Top 10 customers = 77% of revenue.
★ The edge: Reads the barcode on every North American license - including the ones that break the AAMVA standard.
Open →
IDfy
Data
Law forces every bank to KYC. IDfy runs the checks.
Rs 188 Cr
Estimate · $22M · FY25 rev · Entrackr est.
India-concentrated; banks may build in-house.
★ The edge: Indian banks, fintechs and gaming must KYC every user by law. IDfy runs those identity checks by API, priced per check.
Open →
Gumroad
Marketplace
Sell any digital product from one storefront — flat 10%.
$20.7M
Filed · 2023 · $8.9M net · 0 staff
GMV plateaued · flat fee invites churn
★ The edge: he hiked the fee and cut to zero staff — a shrinking company that's wildly profitable.
Open →
HappyFox
SaaS
$20M help desk, zero funding, four salespeople.
$20M ARR
Stated · founder-stated, Apr 2025
One category, three giants with more cash.
★ The edge: Help desk from $24/agent against Zendesk's $19-115 ladder. Mid-market buyers get scale without the enterprise tax.
Open →
Skillcast
SaaS
Compliance training nobody wants and everyone must buy.
£15.3M
Filed · about $20M · FY2025 revenue, audited
UK is 81% of revenue; NRR only 101%.
★ The edge: Sells the audit trail, not the lesson. Every new UK rule adds a mandatory course to 1,221 clients' renewal.
Open →
PIXTA
Marketplace
Japan's biggest stock-photo site, on local faces
$18M/yr
Filed · FY2025 net sales, TSE 3416
AI now generates what buyers once licensed
★ The edge: Licenses amateur-shot photos to Japanese buyers by credit or subscription; keeps 58-78% of each sale.
Open →
Brighter Vision
SaaS
Niche down to therapists. 4,000 subs, $17.5M exit
$17.5M exit
Estimate · sold to EverCommerce, 2020
One niche; a therapist EHR could bundle it
★ The edge: Generic web shops chased any client. Brighter Vision served therapists only, so it out-ranked and out-referred them.
Open →
AutoCount Dotcom
SaaS
Malaysia mandated e-invoicing. AutoCount owned the SMEs.
RM75.3M
Filed · about $17M · FY2025 revenue (audited)
Mandate bump is partly one-off revenue.
★ The edge: 26 years owning the books meant when e-invoicing became law, 240k locked-in SMEs bought the fix from AutoCount.
Open →
Creema
Marketplace
Japan's curated craft market out-earns its rival.
$16.9M
Filed · net sales · yr to Feb '26
Thin margins in a small, mature market.
★ The edge: minne lists more sellers, yet Creema does the bigger GMV — it won on curation and a live festival, not ad spend.
Open →
Fishbrain
Community
20M anglers log their catches. Fishbrain sells the map.
$16M
Filed · FY24 turnover · SEK 165M
Growth has flattened; still lossmaking.
★ The edge: Every catch users log — 14M spots — feeds a forecast dataset rivals can't copy. The community builds the moat for free.
Open →
Discogs
Marketplace
Fans built the database. Discogs takes 9% of sales.
15.6M+
Stated · items sold
One niche: physical-record collectors.
★ The edge: A definitive music catalog crowd-built by collectors over 25 years — a data moat no rival can rebuild.
Open →
IRIS RegTech Solutions
SaaS
Regulators mandate XBRL filing. IRIS sells the tool.
Rs 125.97 Cr
Estimate · $15M · FY25 operating revenue
Africa is 35% of revenue; lumpy deals.
★ The edge: The founders sat on India's XBRL committee, then sold the filing tool regulators went on to mandate.
Open →
RTA Fleet
SaaS
The grandson turned grandpa's fleet software into SaaS.
$15M ARR
Stated · ARR run-rate, 2024 (stated)
Slow, high-touch government procurement.
★ The edge: Inherited 40 years of government-fleet installed base and trust, then rebuilt the legacy product as cloud SaaS.
Open →
iFirma
SaaS
Poland forces digital tax filing. iFirma runs it.
PLN 58M
Stated · 2024 rev · about $15M
Locked to Poland; hard to cross borders.
★ The edge: Poland's first online-accounting brand; 15+ years of local tax law make it the default upgrade as KSeF turns mandatory.
Open →
BuiltWith
Data
Fingerprints a site's tech stack — then sells the reverse.
$14M/yr
Estimate · annual revenue (est.)
Lookup is free · lead-gen cut first
★ The edge: the lookup is free — the real moat is 18 yrs of crawl history nobody can back-fill.
Open →
Rentec Direct
SaaS
A landlord coded his own rent tool — now $14M/yr.
$14M
Stated · annual rev · self-reported
⚠ Entry
crowded
crowded
★ The edge: A landlord taught himself to code, then undercut every VC-funded rival and stayed bootstrapped 18 years.
Open →
Inflectra
SaaS
Self-funded test software vs VC-backed giants
$13M
Estimate · yearly rev · bootstrapped
Thin 5-10% margins, slow linear growth.
★ The edge: A programmer-founder undercut costly HP/Micro Focus ALM on price, then owned the regulated niche giants ignored.
Open →
Jimoty
Ad
Japan's free classifieds board that takes no cut
¥1.93B
Stated · about $12M · FY2025 net sales, TSE reported
Ad income per page view keeps falling
★ The edge: Ten percent of a free sofa is nothing, and posting one costs more than it fetches. Jimoty took what rivals cannot price.
Open →
Nutrient (formerly PSPDFKit)
Dev
A lawyer fixed the pricing: $20K to $1M ARR in 8 months.
$12M ARR
Stated · 2021 · bootstrapped before PE
Investor-owned now; co-founders cashed out.
★ The edge: The SDK is embedded deep in a customer's app, so ripping it out means re-engineering. Switching cost is high.
Open →
Pitchup.com
Marketplace
15% of every campsite night the OTAs ignored
€10.84M
Estimate · about $11.7M · 2024 revenue · FT ranking
No subscription - income stops with bookings
★ The edge: Free to list, 15% only when a booking lands. Campsites that had never sold a night online had nothing to lose.
Open →
Recite Me
SaaS
The accessibility widget the law makes you buy.
£8.8M
Stated · total BGF investment
Masks accessibility; doesn't fix WCAG.
★ The edge: Dyslexic founder built the tool he needed, so it sells as genuine inclusion — not a compliance band-aid like AccessiBe.
Open →
Fakturownia
SaaS
The invoicing app Poland's VAT law made unavoidable.
$11M/yr
Filed · 2025 revenue (KRS filing)
One country's law; free govt KSeF looms.
★ The edge: Polish tax law is complex and always changing; Fakturownia's compliance fluency is a moat generic apps can't copy.
Open →
AstroSage
SaaS
Free birth charts for 80M - AI reads them for pay.
$10M/yr
Estimate · FY25 revenue (Tracxn est)
1/14th of rival Astrotalk's revenue.
★ The edge: Free Kundli tools pull 80M installs via SEO; the paid AI astrologer then answers at about 90% margin.
Open →
Atom.com (formerly Squadhelp)
Marketplace
A $50 naming contest that became a domain marketplace
$10M+/yr
Stated · 8-figure, founder-stated
Google/GoDaddy could curate domains too.
★ The edge: Curates 300k+ brandable domains, appraises them, and sells lease-to-own — a cut raw registrars never earn.
Open →
BBCS
SaaS
Blood bank software the FDA must clear before you ship
$10M/yr
Stated · annual revenue, 40 staff
Few buyers, and the pool never grows.
★ The edge: FDA made blood bank software a medical device in 1994. Every release needs 510(k) clearance, so nobody enters casually.
Open →
Bizness Apps
SaaS
DIY app builder for SMBs. Bootstrapped, sold $20M+.
$10M
Stated · ARR at 2018 exit
SMB-native-app demand later collapsed.
★ The edge: Raised just $100K, so a clean cap table let a PE firm buy 100% all-cash — no VCs to negotiate out.
Open →
BrightGauge
SaaS
Client dashboards MSPs run on top of their PSA tools
$10M ARR
Stated · 2019 exit · bootstrapped
A report add-on the platform could absorb.
★ The edge: Built by brothers who ran their own MSP, so it plugged into the exact ConnectWise/Autotask tools MSPs already used.
Open →
Comalatech
SaaS
Bootstrapped Confluence apps. Sold for mid-8 figures.
$10M/yr
Stated · annual rev., 2021 (TGA)
One platform's rules govern everything.
★ The edge: Three Confluence apps, 10,000+ installs, bootstrapped 17 years — Atlassian's marketplace handled distribution.
Open →
DFnet
SaaS
Drug trials can't run on spreadsheets. Law says so.
$10M
Stated · revenue, SaaS + services
Tiny beside Veeva/Medidata; slow niche.
★ The edge: A trial locked to your validated system can't switch mid-study — years of switching-cost lock-in per client.
Open →
eConnect
SaaS
Spots banned gamblers on cameras casinos already own.
$10M
Stated · annual revenue (Jul 2025)
Facial recognition law can shift overnight.
★ The edge: Software only. It runs on the cameras and POS the casino already bought, so there is no hardware to rip out.
Open →
eShow
SaaS
Association event software. Every module built in-house.
$10M+
Stated · annual revenue, 2025
125 staff on $10M+ is a services cost base.
★ The edge: 14+ modules on one shared database, none of it acquired. The seams rivals inherited never existed here.
Open →
OnlineJobs.ph
Marketplace
Flat $69/mo to hire from 2M Filipino workers.
$10M+/yr
Stated · founder-stated, 2022
Employers cancel right after they hire.
★ The edge: 15 years of free how-to-hire content sends every 'hire a Filipino VA' search to the niche's deepest worker pool.
Open →
TalkingParents
SaaS
Court-proof messaging for divorced co-parents.
$10M+
Stated · ARR · no outside funding
Churns the moment the custody case ends.
★ The edge: A lawyer cofounder made records court-admissible, so judges and attorneys prescribe the app — courts are the channel.
Open →
TaskRay
SaaS
Salesforce-native onboarding app, bootstrapped to $10M
$10M ARR
Stated · founder-stated, 2021 exit
Salesforce owns the platform it stands on.
★ The edge: Native to Salesforce: it lives where the customer data already is, and AppExchange delivers enterprise buyers.
Open →
Vegam
SaaS
No factory background. It runs 300+ plants.
$10M
Stated · revenue (founder, 2023)
Services-heavy; long sales cycles.
★ The edge: 7 years inside one plant taught them the architecture incumbents never got right for messy batch-process factories.
Open →
HiddenLevers
SaaS
The risk tool advisors used to keep clients calm.
$8M
Stated · ARR at 2021 exit
Copyable math, finite US advisor market
★ The edge: Reframed copyable analytics as an advisor client-retention product — then 10x'd the price to prove it.
Open →
Empire Flippers
Marketplace
Buy & sell online businesses — vetting is the moat.
$7.2M
Estimate · 2024 · founder-stated
⚠ No recurring rev
lumpy, deal-by-deal
lumpy, deal-by-deal
★ The edge: Flipping sites wasn't new — they made it safe: every listing vetted, every handover done by their team.
Open →
BiggerPockets
Community
Real estate's town square — a free forum, 3M+ members.
$7M
Estimate · 2016 rev · last public
⚠ Need cyclical
under 1% pay
under 1% pay
★ The edge: Dorkin kept the forum free for years before charging — trust and UGC compounded into a moat rivals can't buy.
Open →
SpyFu
Data
Every keyword your rivals buy and rank for.
$7M+/yr
Estimate · founder-stated, 2019
Semrush/Ahrefs far outspend and out-cover it.
★ The edge: A 20-year archive of who bid on which keywords - history a new rival cannot backfill.
Open →
Ticket Tailor
SaaS
Event ticketing at a flat fee, not a % of the sale.
$6.6M
Estimate · revenue, 2024 (est)
No audience network — bring your own crowd.
★ The edge: Flat $0.30-$0.85 a ticket, never a % of price. An $80 ticket costs cents here vs about $7 on Eventbrite.
Open →
Balsamiq
SaaS
Ugly-on-purpose wireframes designers keep paying for
$6.58M
Stated · 2024 revenue
Figma now does low-fi; TAM is shrinking
★ The edge: Wireframes look hand-drawn on purpose: every mockup is instantly recognizable and markets the tool for free.
Open →
Ratsit
Data
Swedish tax data is public. Ratsit sells the search.
SEK 56.2M
Filed · about $5.8M · FY2025 revenue, 6 staff
One law change ends the whole model.
★ The edge: A constitutional publishing licence puts Ratsit's database outside GDPR, so nobody can demand deletion.
Open →
Flowcase (ex CV Partner)
SaaS
The CV tool consultancies renew 98% of the time.
$5.5M ARR
Stated · ARR, founder-stated (2024)
AI proposal tools could absorb the niche.
★ The edge: Turned a manual Word chore — building consultant CVs for tenders — into a bid tool firms won't drop.
Open →
Less Annoying CRM
SaaS
The anti-Salesforce CRM for small business.
$5.4M
Estimate · 2024 rev · founder-stated
Simple CRM is easy to copy; low lock-in.
★ The edge: One flat $15/user price, no tiers, no lock-in, and real people answer support — rare in a CRM market.
Open →
Boardroom Insiders
Data
Deep C-suite dossiers, licensed to B2B sales teams.
$5M
Stated · ARR at $25M exit
Hand-written data; scaling means hiring.
★ The edge: 14 years and a 25-person research team built 29,000 deep exec profiles rivals couldn't scrape or fake.
Open →
InvoiceASAP
SaaS
$9/mo invoicing app, now $80/mo on embedded payments.
Just under $5M
Stated · annual rev, SaaS + payments
Payment partners can change terms anytime.
★ The edge: Owns the payments, not just the invoice, so it earns a cut of every job instead of a flat monthly fee.
Open →
MoveitPro
SaaS
Movers ran on typewriters. He sold them the fix.
$5M ARR
Stated · founder-stated ARR, Nov 2022
Biggest lead source is $10K/mo of Google ads.
★ The edge: Third-generation mover. He funded five years of development out of the family moving company's profits.
Open →
WebMerge
SaaS
Solo, $5M ARR, sold for $100M.
$5M+ ARR
Stated · ARR at sale · one employee
One narrow job a platform could absorb.
★ The edge: It lived in other apps' add-on marketplaces, so it grew on their distribution while one person kept the margins.
Open →
WeSuite
SaaS
Quoting software for security-system installers.
$5M
Stated · 2024 revenue · cash exit
Tiny niche: 16 years to reach $5M.
★ The edge: Ex-integrators built the one quoting tool that models security installs, recurring monitoring and commissions.
Open →
DashThis
SaaS
Bought out the CEO, then sold for low 8 figures
$4.7M
Stated · revenue at 2023 sale
One narrow job in a crowded reporting market.
★ The edge: Priced by dashboard count, not seats — an agency with 25 client reports pays for 25, and upgrades as it wins clients.
Open →
C
ClickClaims
SaaS
The claims desk for storm-chasing insurance adjusters.
$4M+
Stated · ARR · 50 accounts
Tiny buyer pool, revenue rides the storms.
★ The edge: A claims adjuster who'd already built claims software inside a big firm — he knew the workflow before line one.
Open →
Valkre
SaaS
The account plan, out of PowerPoint and into software.
Beyond $4M ARR
Stated · KAM software subscriptions
Slow category to build; the niche is small.
★ The edge: Valkre wraps the SAMA method KAM teams already train on, so enterprises trust the tool before the demo.
Open →
Cronometer
Data
The accuracy-obsessed answer to MyFitnessPal.
$3.8M
Estimate · Latka estimate, 2024
Free apps count calories fine for casuals.
★ The edge: Food data from lab-verified USDA and NCCDB databases, not crowd entries, so every number earns trust.
Open →
Wall Street Oasis
Community
Free finance forum that sells interview courses.
$300K/mo
Stated · founder-stated · 2020
⚠ Control low
rides on Google traffic
rides on Google traffic
★ The edge: A forum earns pennies on ads; he stacked a niche ad network + paid courses on the same audience.
Open →
Geocaching.com
Community
A GPS treasure hunt, sold as a subscription.
3.4M+
Stated · active geocaches worldwide
Unpaid volunteers keep the whole map alive.
★ The edge: Users hide and maintain every cache free; Groundspeak owns the one global database and charges to search it well.
Open →
PerformLine
SaaS
It reads your affiliates' ads before the regulator does.
$3.2M
Estimate · 2021 ARR, self-report
Demand rises and falls with enforcement.
★ The edge: Brands are liable for affiliate ads they never see. PerformLine auto-discovers those hidden channels and scores them.
Open →
Silktide
SaaS
The free accessibility checker that upsells compliance.
$3M/yr
Estimate · 2024 ARR (Latka est.)
Axe and AI commoditize the core scan.
★ The edge: Twenty years of free scanners built the top-of-funnel; regulation (EAA, ADA) now forces every site through it.
Open →
Towbook
SaaS
Dispatch, impound and billing for tow companies.
$2.9M
Estimate · Est. ARR 2024 (Latka)
Niche TAM ceiling; the code is copyable
★ The edge: Run a tow company's dispatch, impounds and billing through one app and switching costs quietly become the moat.
Open →
Sharetribe
SaaS
The no-code platform behind 1,000+ marketplaces.
$2.4M
Stated · ARR (2023, founder)
No-code ceiling: buyers outgrow it and churn.
★ The edge: Ran a marketplace before selling the tool to build one — operator instincts rivals lack, plus a vow never to sell.
Open →
Equipe
SaaS
Europe's horse shows run on a three-person company
SEK 22.6M
Filed · about $2.2M · FY25 turnover, filed
Near-total at home, so fee rises make news
★ The edge: In 2015 it dropped the flat fee and billed about EUR 1 per start. Small clubs could afford it; Europe adopted it.
Open →
Moraware
SaaS
The default software for countertop fabrication shops.
$2.2M
Estimate · ARR, Latka est. 2025
Countertop-only market caps growth.
★ The edge: A co-founder's brother ran a countertop shop, so v1 was built inside a real fabricator's daily workflow.
Open →
AwardWallet
Data
Tracks every mile and point you own, in one place.
$150K/mo
Stated · monthly rev, founder 2020
Airlines can cut off access any time.
★ The edge: Two decades maintaining scrapers for 600+ loyalty programs behind member logins — a data moat rivals can't clone fast.
Open →
Beeminder
SaaS
The habit tracker that charges you when you fail.
$1M
Estimate · ARR (2024, est.)
Paying to be punished repels the masses.
★ The edge: Rivals sell success. Beeminder gets paid the moment you fail — your own procrastination is the meter.
Open →
BetaList
Marketplace
The startup directory that charges you to skip its line.
$1M
Stated · cumulative over 10 years
Entry low
directory = a weekend clone
directory = a weekend clone
★ The edge: Turned its review backlog into 70% of revenue by charging startups to skip the queue.
Open →
Printavo
SaaS
A screen printer built the software his shop needed
$1M+ ARR
Stated · founder-stated, 2017
Thin tech moat — a dozen lookalike rivals
★ The edge: He ran a screen-print shop first, then built the tool for his own order chaos — an insider selling to insiders.
Open →
Wappalyzer
Data
Detects any site's tech, then sells the list.
$1M+
Stated · ARR, founder-stated
Closing the OSS core spawned free forks.
★ The edge: The free 2M-user extension crowdsources a live tech dataset rivals must crawl for — data as a byproduct.
Open →
Franchise UK
Ad
20 years of SEO turned a directory into $600K/yr.
$600K/yr
Stated · revenue, per Starter Story
Traffic depends entirely on Google rankings.
★ The edge: He had already sold an SEO-built company, so ranking a franchise directory was a bet he knew he could win.
Open →
TractorData
Ad
One guy catalogued every tractor. Ads do the rest.
$46,000/mo
Estimate · est. rev (BoringCashCow)
Depends entirely on Google and ad networks.
★ The edge: The complete, neutral spec sheet for every tractor ever made — the first result for almost every model search.
Open →
AvtoPro
Marketplace
$105M of parts sold through it. They take no cut.
$540K/yr
Stated · founder-stated, mid-war 2022
Earns from ads, not the $105M it moves
★ The edge: A parts catalog matched to 5,000 stores' live stock, and a brand searched 5x more often than the words 'spare parts'.
Open →
MetaFilter
Community
The forum Google built, then nearly killed.
$31.5K/mo
Stated · income vs $30.5K/mo expenses
Built on Google traffic it didn't control.
★ The edge: Ads died overnight when Google's Panda update cut traffic 40%; 15 years of member goodwill funded the site instead.
Open →
eRecht24
SaaS
German law makes every website buy legal texts.
370,000+
Stated · websites secured (Premium)
Germany-only: law and SEO don't cross borders.
★ The edge: A lawyer owns Germany's SEO for the exact legal texts every website is legally forced to publish.
Open →
750 Words
Community
A 17-year-old journaling site, 5,800 members, $26K/mo.
$26K/mo
Stated · monthly, founder-stated
One founder, one flat niche; growth is hard.
★ The edge: Habit lock-in: daily streaks, badges and monthly writing challenges keep members returning for years.
Open →
Pinboard
SaaS
Paid bookmarking, one guy, no VC — profit is the pitch.
$212K/yr
Stated · gross 2020, founder-said
Tiny shrinking market, one-man bus factor.
★ The edge: Charging from day one keeps it solo and profitable, so 'we won't sell you out or vanish' is a promise he can keep.
Open →
FreeAgent
SaaS
UK freelancers' books, now free inside their bank app.
150,000+
Estimate · businesses on FreeAgent
Its growth now leans on one bank.
★ The edge: Owned by NatWest, which hands it free to every business-banking customer — a channel rivals cannot buy.
Open →
iubenda
SaaS
Every website's privacy policy, auto-updated forever.
150,000
Stated · clients worldwide
Control Mid low end cloneable
★ The edge: Laws keep changing - iubenda's lawyers auto-update every policy, so churn stays near zero.
Open →
52Frames
Community
A free weekly photo challenge, monetized after a decade.
$11K/mo
Stated · founder-stated, May 2023
⚠ Bus factor of 1
solo, weekly, forever
solo, weekly, forever
★ The edge: Rivals hand you a prompt or a crowd. 52Frames fuses a weekly ritual with a 13K-member feedback loop.
Open →
Planning Center
SaaS
Church software that made itself impossible to sell.
90,000+
Stated · churches
Bounded to churches; low ARPU by design.
★ The edge: Two church staffers fixed their Sunday-service chaos in 2006, then compounded 20 years of trust with no VC and no exit.
Open →
Cliniko
SaaS
Bootstrapped clinic software, built with an osteopath.
65,000+
Stated · practitioners
Crowded category full of funded rivals.
★ The edge: Built with an osteopath, not by a generalist — 14 bootstrapped years turned clinical depth into trust rivals can't buy.
Open →
Bandzoogle
SaaS
The site builder that takes 0% of what artists sell.
60,000+
Stated · artist sites and stores
Bounded, slow-growth music niche
★ The edge: A music-only website builder that takes 0% of what artists sell - you keep 100%, it lives on your flat monthly fee.
Open →
DudeRanch.com
Marketplace
Bought DudeRanch.com; the domain does the marketing.
$50.5K
Stated · /yr TTM · solo · sold '25
⚠ Scale capped
one niche, about $50K/yr
one niche, about $50K/yr
★ The edge: He didn't build demand — he bought the door to it: about 50 free type-in visits a day, costs near zero.
Open →
Focus NFe
Dev
Brazil forces e-invoices by law. He's the API.
50,000+
Stated · client companies
Gov owns the standard + a free emitter.
★ The edge: Brazil's 5,570 cities each run a different e-invoice system. Focus integrated 3,000+ into one API.
Open →
OwnerRez
SaaS
Run your rentals, own your bookings. Flat fee.
50,000+
Stated · active properties
Steep setup — power users only, not newbies.
★ The edge: Direct API links to Airbnb, Vrbo and Booking.com let it charge a flat monthly fee, never a percent of your revenue.
Open →
Jackrabbit Technologies
SaaS
17,000 activity centers. Zero VC. 20 years.
17,000+ centers
Stated · clients; rev. never public
The niche is finite; TAM caps growth.
★ The edge: Twenty years building per-sport workflow — gym, dance, swim, cheer — that funded rivals never match in depth.
Open →
Stocksmith (ex-Craftybase)
SaaS
Inventory + true-cost bookkeeping for makers
10,000+
Stated · product businesses
⚠ Scale capped
niche TAM · revenue hidden
niche TAM · revenue hidden
★ The edge: Generic books stop at 'spent $200 on supplies.' Craftybase costs every gram — true per-item cost.
Open →
FastBound
SaaS
By law, every gun dealer logs every gun. We're the log.
10,000+
Stated · FFLs since 2010
US-only FFL ceiling; ATF/politics can shift.
★ The edge: The only e-bound-book bundled with an attorney-backed legal defense — it sells the ATF-audit fear, not features.
Open →
CattleMax
SaaS
Ranchers' herd records, bootstrapped since 1999.
8,000+
Stated · farms and ranches
Small herds, small budgets — low ceiling.
★ The edge: A niche too small and unglamorous for big SaaS to bother with, held by 25 years of ranch-specific depth and referrals.
Open →
shopVOX
SaaS
The back office for custom sign and print shops
3,000+
Stated · customers worldwide
Thin niche, low ARPU, glacial word-of-mouth
★ The edge: Every sign shop already ran QuickBooks, so shopVOX sat on top as the quote-to-cash layer, never replacing the books.
Open →
L
LabStar
SaaS
Cloud back-office for the labs that make your crown.
600
Stated · dental labs worldwide
Tiny, shrinking market limits the upside.
★ The edge: Noles had run a dental lab AND led eBay Asia, then built the cloud tool his old lab needed, co-designed with six labs.
Open →
Open Dental
SaaS
Practice software a dentist built to undercut Dentrix
300+
Stated · employees
Just closed its 20-year open-source promise
★ The edge: Free GPL code for 20 years won trust and about 20,000 practices; painful data conversion now keeps them from leaving.
Open →
CIMcloud
SaaS
Bootstrapped B2B stores synced to legacy ERPs
119%
Stated · 3-yr revenue growth
Every deploy is an ERP integration project.
★ The edge: Shopify treats B2B as an add-on. CIMcloud was ERP-first: real-time price, stock and order sync for distributors.
Open →
The CE Shop
SaaS
The law makes them renew. He sold them the renewal.
$29-64M
Estimate · rev. band, 2020 (DBJ)
One vertical, tied to US license law.
★ The edge: State law forces every agent to renew, so the CE bill repeats every 1-2 years on its own.
Open →
Voices.com
Marketplace
Hire a pro voice actor in a day — Voices takes 20%.
8-figure/yr
Stated · membership + 20% fee
⚠ Need at risk — AI TTS undercuts human talent
★ The edge: Charge the side with the money: bill clients only when they hire, via escrow — that flip unlocked liquidity.
Open →
TeamGantt
SaaS
Beat project-management giants by owning one keyword.
7-figure ARR
Stated · founder-stated on air
Gantt is a feature rivals can bundle free.
★ The edge: Ranks #1 for 'gantt chart' for over a decade, so intent-rich buyers arrive from free organic search at near-zero cost.
Open →
OnTheClock
SaaS
Boring time clock, bootstrapped to $5-10M ARR.
$5-10M ARR
Stated · ARR, self-reported range
Low barrier; big rivals bundle it for free.
★ The edge: Hourly employers must track time for payroll and law; a dead-simple $4/employee clock wins on search and word of mouth.
Open →
Seobility
SaaS
Gave away SEO checks, sold the funnel for millions.
$2.5-5M ARR
Estimate · est. ARR at sale (TGA)
Its whole market rents attention from Google.
★ The edge: The exit wasn't the win. A lean, profitable tool with a 400k-user free funnel is what a serial buyer pays for.
Open →
AdButler
SaaS
The neutral ad server publishers own, not Google.
148% 3-yr growth
Estimate · revenue never disclosed
Google gives an ad server away free
★ The edge: The pitch isn't 'cheaper than Google's free server.' It's that Google, the biggest ad buyer and seller, isn't neutral.
Open →
AgencyAnalytics
SaaS
White-label client reports for marketing agencies.
$15.7M ARR
Estimate · Latka est.
Reporting is commoditized; rivals copy fast.
★ The edge: Priced per client, so revenue scales with each agency's roster; white-label makes the report the agency's own.
Open →
AstroBin
Community
Astrophotography's default gallery + gear database.
10,000+
Stated · active members daily
Tiny niche; storage costs climb as it grows.
★ The edge: Members' photos double as a gear database - the reference imagers check before spending thousands on a scope.
Open →
Bandcamp
Marketplace
Fans buy music direct — and artists keep about 82%.
$1.3B+
Stated · paid to artists to date
Streaming gravity caps the ceiling
★ The edge: fans buy music direct instead of streaming pennies — revenue rises only when the artist's does.
Open →
BeatStars
Marketplace
Where a $30 beat becomes a No.1 record.
$400M+ to creators
Stated · lifetime GMV, not revenue
Producers multi-home; little lock-in.
★ The edge: An ex-distribution insider turned a beat-curation blog into the marketplace where unknown producers sell No.1 hits.
Open →
Bushel
SaaS
Half of North America's grain runs on Bushel.
50%+ of US/Canada grain
Stated · revenue never disclosed
One commodity, one continent, big-ag backers.
★ The edge: Built for the grain elevators everyone found too boring. Farmers use it free; the facilities pay to reach them.
Open →
Business Infusions
SaaS
The tool one horse hospital built, sold to its rivals
400+ vet practices
Stated · revenue never disclosed
Tiny, finite equine-vet market
★ The edge: Born as one horse hospital's own software, it fit equine work the small-animal vet giants never built for.
Open →
CellarTracker
Community
The shared cellar book wine geeks all write in.
Undisclosed
· estimate withdrawn
A wine cellar is a niche, however deep it runs.
★ The edge: Millions of community tasting notes — a bigger wine-review database than every pro critic combined, and free to build.
Open →
Commusoft
SaaS
Bootstrapped 20 years selling to plumbers and HVAC firms.
10,000+ pros
Stated · revenue never disclosed
One country's rules; slow, quote-only sales.
★ The edge: Generic job apps skip UK trade compliance — gas certs, service contracts, planned maintenance. Built for it.
Open →
Deque Systems
SaaS
The accessibility test engine Google & MS use.
3 billion+ axe downloads
Stated · revenue never disclosed
Services-heavy; the engine is free.
★ The edge: Deque owns axe-core, the free engine inside Google Lighthouse and Microsoft's tester. Rivals ship its code.
Open →
ExpressTruckTax
SaaS
E-file the truck tax the IRS forces on every big rig.
Undisclosed
· figure withdrawn
Just a $15 one-time fee — easy to undercut.
★ The edge: Federal law makes every heavy truck file Form 2290 yearly. ExpressTruckTax became the default place to do it.
Open →
iClassPro
SaaS
The software a gymnastics-gym owner built for himself.
$5.7M+ ARR
Estimate · Latka est.
Crowded niche; Jackrabbit pioneered it.
★ The edge: A national-champion coach who owned a gym built the tool he needed, then won schools on trust and support — not ads.
Open →
Letterboxd
Community
Books had Goodreads. Film buffs built their own.
29M+ members
Estimate · revenue never disclosed
About 4% pay; the other 96% cost to serve.
★ The edge: Cactuslab, the founders' web studio, bankrolled eight loss-making years until the film-diary habit was too entrenched.
Open →
Ontraport
SaaS
A CRM built in a yurt, grown with no VC money.
$20.4M ARR
Estimate · est. ARR; never disclosed
Customer base roughly flat for a decade.
★ The edge: Bootstrapped on a trader's savings, it hit 383% 3-yr growth and made the Inc. 500|5000 three years straight.
Open →
OpenSnow
SaaS
Skiers pay for the one forecast they trust.
$0
Stated · outside capital raised
Free AI weather may erase the edge.
★ The edge: Free weather is everywhere; they sell trust: a decade of accurate powder calls from named meteorologists.
Open →
PredictWind
SaaS
America's Cup weather tech, sold to every sailor.
1M+
Stated · users (Dec 2023)
Free rivals like Windy commoditize the data.
★ The edge: Licensed the exact weather models that won the America's Cup, then sold them to every cruiser for $29-499 a year.
Open →
PriceCharting
Data
Turns every eBay sale into the price of every game.
3.5M
Stated · monthly users
Its whole dataset rents eBay's sale feed.
★ The edge: 18 years of completed eBay sales, auto-graded into the one price dealers quote — a time-series rivals can't rewind.
Open →
Ravelry
Community
Knitting's community — run profitably by about four.
9M+ members
Stated · revenue never disclosed
One niche · community-dependent
★ The edge: it earns from its own members (self-served ads) at about 3.5% — aligning beat taxing the crowd.
Open →
ReciPal
SaaS
FDA labels are the law - he made them $59.
Thousands
· food businesses, 10+ yrs
Scale Low
tiny, price-capped niche
tiny, price-capped niche
★ The edge: The FDA mandates the label. ReciPal sells it at $59, not the $5,000 lab-software incumbents charge.
Open →
Rock Gym Pro
SaaS
Gave it away on a forum. Became the standard.
200+ facilities
Stated · revenue never disclosed
The whole market is a few thousand gyms.
★ The edge: Climbing-only workflow — day passes, waivers, liability — that generic studio software never bothered to build.
Open →
ServiceM8
SaaS
Job software for tradies, built Apple-first.
$50B+
Stated · in jobs billed (not revenue)
iOS-only long capped its market reach.
★ The edge: Kim ran a locksmith; the paperwork pain was his. Son Ben, an engineer, built the software fix.
Open →
Shodan
Data
Google indexes web pages. Shodan indexes devices.
3M+
Stated · registered users
Key-person lean; Censys cloned it with VC.
★ The edge: A 15-year, continuously-crawled index of every service on the public internet — a dataset newcomers can't back-fill.
Open →
Showit
SaaS
The website builder photographers actually evangelize.
50,000 customers
Stated · customers
Crowded space; giants beat it on price.
★ The edge: Photoshop-like design freedom Squarespace and Wix don't offer; a designer template market does the selling.
Open →
Tax1099 (Zenwork)
SaaS
The IRS made e-filing mandatory. They sell the button.
$163M
Stated · raised, first outside round
The IRS offers the same filing free (IRIS).
★ The edge: IRS-authorized transmitter status is a licensed moat; QuickBooks, Xero and Bill embed its filing button.
Open →