Niche business ideas that make money
The unglamorous corners where competition is thin: vertical software for one trade, and products whose demand a regulation makes mandatory. Boring on the surface, real revenue underneath — with the source for every number.
40 real companies · every number links to the page that reports it · corrections published
- 1
IPO'd days before the 2018 Wayfair ruling forced millions of online sellers into multi-state sales-tax filing.
E-commerce seller connects AvaTax to its cart, billing or ERP → Each order pings Avalara for the exact rate across 13,000+ jurisdictions → Seller pays subscription + per-transaction fees - and Avalara files the returns
The catch Stripe Tax bundles the core calc cheaply.
Read the full teardown → - 2
The SEC didn't allow XBRL filings — it required them, making every public company a forced buyer.
SEC mandates XBRL + SOX reporting → Companies file on Workiva's linked platform → Annual subscriptions renew and expand
The catch ⚠ Scale: heavy sales
Read the full teardown →
GAAP-loss years - 3
The neutral hub: it ingests leads from Zillow and its rivals alike, so every team needs it.
Teams buy leads across Zillow, Realtor.com, 200+ portals → FUB pools every lead into one inbox, auto-routes and texts → Each seat pays $69/mo — monthly, no contract
The catch Owned by Zillow now — is it still neutral?
Read the full teardown → - 4
The most boring wedge won: replace the dentist's phone, tie each call to the patient chart, impossible to rip out.
Practice installs Weave phones + syncs its practice-management software → Front desk runs calls, texts, reminders, reviews and payments in one app → Practice pays a per-location monthly subscription - recurring SaaS revenue
The catch Never profitable; retention under 100%.
Read the full teardown → - 5
Ten years filming workplace injuries as a PI gave Anear buyer access and hazard know-how no app-first rival had.
WHS/OSHA law: every site must document safety checks → Free iAuditor app spreads worker-to-worker, team-to-team → Teams buy seats ($24-29/user/mo) to manage it at scale
The catch Low moat vs generic form/checklist apps
Read the full teardown → - 6
An insider PT made WebPT the rehab profession's teacher (blog + Ascend summit), so clinics arrived before any ad ran.
Rehab clinic subscribes, per therapist seat → Adds billing, scheduling, patient-marketing modules → WebPT charges every provider monthly, all recurring
The catch One vertical; a UX-led rival is taking share.
Read the full teardown → - 7
The founder was a clinic owner — Jane fit real allied-health workflows generic rivals only guessed at.
Clinic subscribes, flat rate CAD $54-99/mo → Adds practitioners (rate shown only inside Jane's calculator) and add-ons: AI Scribe CAD $15/mo per practitioner, Insurance Billing CAD $20/mo + $5 per extra full-time practitioner → Recurring subscriptions compound to $100M ARR
The catch Crowded lane: SimplePractice, Cliniko, more
Read the full teardown → - 8
GDPR forces a consent banner on every EU site; Google now requires a certified one. Usercentrics is certified.
EU privacy law requires consent before tracking → Usercentrics scans trackers, shows a banner, logs consent → Sites pay a monthly subscription to stay audit-ready
The catch Its tailwind and its risk are both Google.
Read the full teardown → - 9
A crypto client asked for KYC; they dropped photoshop-detection and went all-in on AML checks before incumbents cared.
AML law forces fintech, crypto and gambling to ID every new user → They embed Sumsub's verification SDK at signup → Sumsub bills per successful check — from $1.35, and re-screens forever
The catch Crowded market; per-check prices falling.
Read the full teardown → - 10
They pre-built compliance across dozens of countries, so every new e-invoice mandate lands as ready-made demand.
New law forces e-invoicing in a country → Firms plug into Pagero's compliant network → Recurring subscription + per-document fees
The catch ⚠ Control: rules shift
Read the full teardown →
loss-making land-grab - 11
An engineer rode along with a pool pro, so Skimmer bills per pool and logs chemistry like the trade does.
Pool pro runs routes on paper and whiteboards → Adopts Skimmer: routes, chemistry, photos, auto-invoicing on mobile → Pays $49-98/mo base plus per-pool; Skimmer bills recurring
The catch One trade, mostly US: finite TAM.
Read the full teardown → - 12
Poland's first online-accounting brand; 15+ years of local tax law make it the default upgrade as KSeF turns mandatory.
Polish sole trader is legally required to file digital VAT/JPK and issue KSeF e-invoices → Subscribes to ifirma.pl to auto-run bookkeeping, filings and e-invoices → Pays a recurring monthly fee - 97% of iFirma's revenue
The catch Locked to Poland; hard to cross borders.
Read the full teardown → - 13
Sold to 100,000+ SMBs too scared of an ADA suit to buy a real audit — one script tag, about $490/yr.
SMB dreads an ADA lawsuit — about 2,500 web suits a year → Installs one line of JS, pays about $490/year → Recurring fees across 100,000+ websites
The catch entry Low
Read the full teardown →
clones - 14
Guy Pearson was a chartered accountant sick of chasing his own clients to pay. He built Ignition for his firm first.
Firm sends a client a proposal + engagement letter in Ignition → Client accepts online; card or bank details captured up front → Ignition auto-bills and collects SaaS fee + a cut of each payment
The catch Xero or QuickBooks could bundle this in.
Read the full teardown → - 15
Courts manufacture the demand: thousands of ADA web suits a year scare SMBs into buying compliance they can't judge.
ADA web lawsuits surge - 26,253 filed in 2025, up 102% since 2020 → Web hosts and resellers bundle AudioEye's widget + expert fixes to SMBs → 131k sites pay recurring subscriptions -> $40M ARR
The catch Its demand engine (lawsuits) can turn on it.
Read the full teardown → - 16
Gave the app free to contractors and billed the agency - the party the law forces to collect payroll weekly.
Davis-Bacon forces weekly certified payroll on every publicly funded job → Agency adopts LCPtracker and requires all primes and subs to file in it → Agencies pay the subscription; thousands of contractors file free
The catch US-only law; grows one slow agency at a time.
Read the full teardown → - 17
A state mandates Metrc; every licensed cannabis operator must then pay in to stay legal. The regulator is the moat.
A state legalizes cannabis and mandates seed-to-sale tracking → Metrc wins the state's track-and-trace contract (the RFP) → Every licensed operator pays a monthly Metrc fee ($40/mo in Oklahoma) + RFID tags to stay legal
The catch Every dollar rides on renewable state deals.
Read the full teardown → - 18
Free to list, so captains flooded in. FishingBooker takes 10-30% only when a trip books. No VC, profitable in 4 mo.
Captain lists boat, free → Angler books the trip online → FishingBooker keeps the commission the captain sets, 10-30%
The catch Captains resent fees, nudge 'book direct'.
Read the full teardown → - 19
Won a boring niche by living in its Facebook groups for years, then bundling 5 tools into one app.
Inspector subscribes at $109/mo base → Runs every job through the app — reports, scheduling, texting, payments → Spectora earns subscription + per-inspection usage + payment cut
The catch Scale low
Read the full teardown →
finite US inspector TAM - 20
When a govt forces millions to file taxes digitally, whoever ships the easiest compliant rails becomes default plumbing.
Govt mandates GST returns + e-invoicing → Firms plug Clear into their ERP to file → Recurring SaaS subs + per-invoice fees
The catch Govt's free portal can commoditize filing.
Read the full teardown → - 21
Leaving BIS means re-certifying your whole crew — so under 1% churn. Half of new customers come by referral, not ads.
Law mandates safety training + records → BIS runs the LMS, records + course store → Annual per-seat SaaS + courses — 99% renew
The catch Labor-heavy; one vertical, mostly Canada.
Read the full teardown → - 22
18 years running a real millwork shop taught him every bid-to-install workflow no outside SaaS team can fake.
Millwork shop can't run bids and jobs on generic tools → Adopts Innergy: estimating -> fabrication -> field install → Pays a recurring subscription, priced by quote (Innergy publishes no pricing) -> about $25M revenue in 2025
The catch Finite market — only so many millwork shops.
Read the full teardown → - 23
Prior incorporation firms feed new startups into a free cap table, then upsell the 409A the IRS forces them to buy.
Startupr and IncParadise incorporate startups → Free cap table pulls them into Eqvista → Paid 409A the IRS forces, renewed yearly
The catch 409A is a commodity Carta gives away cheap.
Read the full teardown → - 24
Went deep on the one job incumbents underserved - tax-smart retirement drawdown - at half eMoney's price.
Advisor builds client plans in RightCapital → Tax-smart drawdown and portal win the client → Advisor renews at about $2,520/yr per seat
The catch Two of three rivals are giant-owned bundlers.
Read the full teardown → - 25
Global booking apps ignored the Caribbean's payment problem. A St. Maarten catamaran kid built the rails others skipped.
Operator embeds Junglebee's booking form on their own site → Tourist books and pays a card deposit through JB Pay → Junglebee keeps about 4% of every booking; $0 monthly
The catch One region, one tourism economy - no 10x.
Read the full teardown → - 26
A founder who spent a year in a diesel shop built software shops actually run on — and 99%+ of them never leave.
A diesel shop ditches paper and moves work orders, PM and invoicing into Fullbay → Techs, parts, customer approvals and payments all run in one system → Shop pays from $188/mo per shop (Basic: one location, up to five users, one full user license included; extra users $89/mo); Fullbay also earns on integrated parts and payments
The catch Finite niche; PE-owned, raising prices.
Read the full teardown → - 27
An EU directive gave 200k firms a hard deadline to install a report channel. Formalize was built to catch it.
EU law forces 50+ firms to add a report channel → 500+ auditors and law firms resell it to clients → Clients pay an annual per-seat subscription
The catch Whistleblowing is a cheap, cloned commodity.
Read the full teardown → - 28
Won a crowded texting market on focus and cost, from Chattanooga — then absorbed 20k orphaned Zipwhip customers.
Business subscribes: monthly per-number/seat plan → Team texts customers from one shared inbox (Twilio pipes) → Sticky recurring MRR across 100+ verticals
The catch Built on Twilio; thin moat, crowded field.
Read the full teardown → - 29
Built by a Houston shop owner who mopped his own floors — mechanics trust software from someone who did their job.
Shop subscribes: $199-439/mo per location → Runs repair orders, inspections, payments in-app → Monthly SaaS + a cut of each card payment
The catch Crowded field, features are copyable.
Read the full teardown → - 30
Inherited 40 years of government-fleet installed base and trust, then rebuilt the legacy product as cloud SaaS.
City or state fleet buys RTA to run its shop → Billed per vehicle, per month across the fleet → Sticky recurring ARR; more vehicles, more revenue
The catch Slow, high-touch government procurement.
Read the full teardown → - 31
Not a CRM: purpose-built call-center software for dealership BDCs, sold on OEM vendor lists so co-op money pays for it.
Dealership BDC must call leads, service and recalls → Volie runs the dialer, campaigns and clean data → Stores pay $1k-2k/mo; dealer groups $6k-13k/mo
The catch Narrow US auto vertical caps the TAM.
Read the full teardown → - 32
A landlord taught himself to code, then undercut every VC-funded rival and stayed bootstrapped 18 years.
Landlord subscribes: from $50/mo monthly ($45/mo if billed annually), scaling by unit count → Tenants apply, get screened, and pay rent in-portal → Rentec stacks screening ($10-18) + card fees (2.95%) on top
The catch ⚠ Entry
Read the full teardown →
crowded - 33
Turned ADA-lawsuit panic into a self-serve $49/mo widget — dread and distribution, not accessibility, built the revenue.
SMB fears (or gets) an ADA demand letter → Pastes UserWay's one line of JavaScript → Pays $49-$249/mo for the widget, by traffic
The catch Overlays don't actually make sites compliant.
Read the full teardown → - 34
One split-tested website design, tuned on tens of thousands of investor leads, outranks rivals' template menus.
Site ranks for 'we buy houses' + 'sell my house fast' → Motivated-seller leads land in the investor's inbox → Investor renews $99-199/mo for years - Carrot's ARR
The catch Whole value rents Google's front page.
Read the full teardown → - 35
EU regulators ruled Google Analytics illegal, turning the free market leader into a legal liability. Fathom is the fix.
EU regulator rules Google Analytics illegal under GDPR → Sites switch to Fathom: EU-hosted, no cookie banner → Flat $15-470/mo subscription, billed by pageviews
The catch Most sites still risk it with free GA4.
Read the full teardown → - 36
Out-focus, not outspend: cleaner UX than clunky Bullhorn, sold via a dad with decades of staffing access.
Agency starts a free trial → Runs sourcing, ATS, CRM and billing in one place → Pays per seat, monthly or annual
The catch Crowded ATS niche; incumbents are sticky.
Read the full teardown → - 37
Polish tax law is complex and always changing; Fakturownia's compliance fluency is a moat generic apps can't copy.
Law requires VAT-compliant invoices → Business adopts Fakturownia to comply → Monthly SaaS subscription
The catch One country's law; free govt KSeF looms.
Read the full teardown → - 38
20 years inside Salary.com, PayFactors and PayScale taught the founder exactly which comp workflow to unbundle.
Large employers must market-price hundreds of jobs a year → BetterComp auto-matches those jobs across every survey → Comp teams pay annual subscriptions to keep it current
The catch Now VC-backed; incumbents own the surveys.
Read the full teardown → - 39
First BSI-certified cloud TSS — rivals shipped chips; fiskaly made compliance one API call, billed per terminal.
German law: every POS needs a BSI-certified TSS → POS/ERP vendors integrate fiskaly's cloud API — no hardware → Recurring fee per active terminal / TSS
The catch New country = a fresh multi-year cert.
Read the full teardown → - 40
A lawyer cofounder made records court-admissible, so judges and attorneys prescribe the app — courts are the channel.
Court or attorney tells co-parents to log all contact on the record → Each parent signs up; the app adds calling, calendar, and payments → Both parents pay $7-32/mo — 100k paying, $10M+ ARR
The catch Churns the moment the custody case ends.
Read the full teardown →
This list is a slice of Kaeda's library. Every figure is filed, stated by the company, or our estimate with the arithmetic shown — and when a source turns out not to say what we said, we change the number and publish the correction.