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
Tax rates change constantly across 195+ countries; Vertex has kept a 1B+ rule database current since 1978.
Company sells across 195+ countries, owes tax on every sale → Vertex prices each transaction correctly inside SAP and Oracle → Customer pays annual subscription + per-transaction fees
The catch Growth slowing; SMB edge lost to Avalara.
Read the full teardown → - 4
Eight years selling paperless tools inside tax firms told them exactly which 30 minutes to automate in 2016.
Firm preps the return in CCH, Intuit or Thomson Reuters → SafeSend assembles it, collects the taxpayer e-signature, delivers → Firm pays per return delivered, every return, every season
The catch Sits downstream of engines it doesn't own.
Read the full teardown → - 5
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 → - 6
Accreditors, OSHA and CMS require the training; HealthStream is where US hospitals buy and log it.
Accreditors and law mandate clinical training + credentialing → US hospitals run and track all of it on HealthStream → Per-professional annual subscriptions renew
The catch Growth is slow: about 4% a year.
Read the full teardown → - 7
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 → - 8
They wrote the first automated hospital chargemaster in 1999; US billing rules keep about 40% of hospitals renewing.
Federal 340B and CMS rules force billing compliance → Trisus SaaS runs the chargemaster, 340B and price files → About 40% of US hospitals pay annual subscriptions
The catch Finite TAM; about 40% already installed.
Read the full teardown → - 9
Owns the church software and the payment rails, so it earns a margin on every dollar of US$7.6B given yearly.
Church subscribes to ChurchStaq: giving app, donor CRM, church software → Congregation gives through the app — recurring and one-off donations → Pushpay charges SaaS fees plus a margin on every donation processed
The catch US churches only — a finite, capped market.
Read the full teardown → - 10
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 → - 11
Eleven years of startup raises built a 1.79M-investor list. Selling that list pre-IPO stakes now pays 79% of revenue.
1.79M people sign up free to browse startup raises → StartEngine buys shares of late-stage private companies → Sells stakes in those funds to accredited users: $86.6M
The catch 79% of revenue sits in one product line.
Read the full teardown → - 12
Motoe is a lawyer. CloudSign was the first witness-type e-signature Japan's Ministry of Justice recognized.
Free legal Q&A ranks for Japan's legal worries → Lawyers pay to be listed and to answer → Companies pay per contract sent on CloudSign
The catch One country, one law. It travels nowhere.
Read the full teardown → - 13
AML law mandates the demand, not marketing. 400M video checks train an accuracy edge rivals can't copy fast.
AML/KYC law forces regulated firms to verify every user → They embed Veriff's API; user does a live ID + face check → Veriff charges per verification, on a monthly platform deal
The catch Per-check pricing invites undercutting.
Read the full teardown → - 14
The shared closing room lenders, agents and title firms all log into - leaving means moving the whole deal.
Title & escrow firm subscribes to Qualia's closing platform → Lenders, agents, buyers & sellers all transact in that shared room → Qualia bills per seat plus fees on each closing
The catch Volume falls when mortgage rates rise.
Read the full teardown → - 15
Shipped the first GenAI drafting tool for lawyers in 2022, native to Microsoft Word, sold self-serve by the seat.
Firm or in-house team buys seats ($99-199/mo) → Lawyers draft and review in Word daily; playbooks lock in the workflow → Annual per-seat plans compound toward about $100M ARR
The catch Harvey has far more capital and BigLaw.
Read the full teardown → - 16
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 → - 17
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 → - 18
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 → - 19
Accounting firms put clients on it, so partners do the selling — and every invoice meters the bill.
Accounting firm signs up as a PowerOffice partner → Firm moves its SMB clients onto PowerOffice Go → Each client pays NOK 425/mo plus NOK 9 per invoice
The catch Norway only; Visma now owns it.
Read the full teardown → - 20
Europe's eID schemes are fragmented and national; Signicat integrated 35+ into one API regulated firms onboard through.
Bank must verify a new customer's identity (KYC/AML law) → Signicat routes it to the right national eID or document check → Charge per verification and per e-signature
The catch It resells national eIDs it doesn't own.
Read the full teardown → - 21
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 → - 22
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 - 23
US betting law requires a geolocation check on every bet, and GeoComply runs it for nearly every major operator.
A state legalizes online betting; its rules demand a geolocation check → Operators like FanDuel and DraftKings integrate GeoComply to comply → Operators pay for those checks — about 2 billion a month
The catch Tied to gambling law it does not control.
Read the full teardown → - 24
AML law forces every bank and fintech to screen customers; ComplyAdvantage owns the risk database they check against.
Regulator mandates AML screening for every regulated firm → Fintechs and banks plug into ComplyAdvantage's real-time risk database → They pay recurring API and seat fees to stay compliant
The catch Deep-pocketed incumbents own the big banks.
Read the full teardown → - 25
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 - 26
Every online gun sale must end at a licensed dealer. GunBroker wired 32,000 of them in and bills the sale.
Sellers list guns and gear, paying for listing options → Buyer wins; the item ships to a licensed FFL dealer → GunBroker bills a final value fee plus a buyer service fee
The catch Revenue still sits below its FY22 peak.
Read the full teardown → - 27
In the EU you can't run ads without a certified consent banner, so a CMP is a forced install, not a nice-to-have.
EU site must show a consent banner to run ads legally → Didomi's certified CMP collects and logs the consent → Client pays an annual subscription, priced on monthly visitors
The catch Google sets the rules, not Didomi.
Read the full teardown → - 28
Useme becomes the legal seller of the work, so someone with no registered business can still issue a real invoice.
Freelancer with no registered business posts a deal → Useme contracts both sides and invoices the client → Client pays Useme; it keeps 4.99% and pays the freelancer
The catch Thin take: 4.99% of a pass-through flow.
Read the full teardown → - 29
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 → - 30
The EOS coaches are his sales force; 18,500 companies deep, the community moat compounds with every new cohort.
EOS coaches recommend Ninety to the teams they run sessions with → Leadership teams run weekly meetings, rocks and scorecards in it → Each seat pays $12-16 every month
The catch EOS owns the trademark and its own app.
Read the full teardown → - 31
Sells only to Finnish construction and building-services firms — then keeps their books and payroll too.
A Finnish plumbing or electrical firm signs up for Ultima → Site hours, purchases, invoices and payroll run through one system → Monthly SaaS fee, plus Admicom's own accounting service
The catch Grows 6% a year. One industry, one country.
Read the full teardown → - 32
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 → - 33
Rivals sold scheduling or tracking; Port had sold a telematics SaaS, so BigChange shipped both in one app.
Trade or fleet firm subscribes per user and vehicle → Schedules jobs, tracks vans, invoices in one app → Recurring seats compound to £30M+/yr
The catch Took £75M ($95M) PE, sold to Simpro.
Read the full teardown → - 34
Bootstrapped on about $200K, it undercut on-prem rivals with month-to-month web SaaS, then sold to AutoTrader for $150M.
Dealer lists cars, photos pushed to AutoTrader → CRM tracks every lead, tasks the sales team → Dealer pays $500-1k/mo, cancel anytime
The catch One vertical, under the DMS giants.
Read the full teardown → - 35
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 → - 36
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 → - 37
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 → - 38
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 - 39
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 → - 40
So easy a non-technical salon owner runs booking, POS and payroll solo — and stays (110% NRR).
Salon owner signs up (from $165/mo) → Runs booking, POS, payroll on Mangomint → Pays monthly + payment fees, about $7k/yr
The catch One vertical; growth caps at salon-count.
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.