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 · re-checked, every change logged
- 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
Founder Jeff Tangney built Epocrates first, so he already had physician trust and knew pharma pays to reach doctors
Verify US doctors, free forever → They read, message, use clinical tools daily → Pharma & hospitals pay to reach them
The catch Leans on pharma marketing budgets
Read the full teardown → - 5
Rivals' angriest customers are the pipeline: MSPs leaving Kaseya and ConnectWise land on NinjaOne.
MSP or IT team installs the Ninja agent on every endpoint → Adds modules: patch, backup, remote access, security → NinjaOne bills per device each month — revenue scales with every endpoint added
The catch Microsoft could bundle this into Intune.
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
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 → - 13
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 → - 14
Microcat is the maker-endorsed parts catalog dealers update monthly and rely on across 186 countries.
Carmakers' parts data is a mess of codes and updates → Microcat digitizes it, refreshed monthly, per brand → Dealers subscribe per site to look up genuine parts
The catch Tied entirely to the automotive industry.
Read the full teardown → - 15
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 → - 16
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 - 17
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 → - 18
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 → - 19
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 → - 20
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 → - 21
Rivals chased Fortune 500 carbon budgets; Greenly made carbon accounting cheap and self-serve for SMEs.
CSRD forces big firms to report carbon → Greenly imports data, builds audit-ready report → Client pays annual SaaS subscription
The catch ⚠ External demand
Read the full teardown →
CSRD scope cut 80% - 22
Since Wayfair (2018), any seller crossing a state's threshold must register and file there — or owe back taxes.
Seller links billing — Stripe, Shopify, ERP → AI tracks nexus, registers and files per state → Bills $75 per filing or registration
The catch Vertex is both its investor and its rival.
Read the full teardown → - 23
not a payments tool but a liability shield — it files every country's sales tax for you.
Developer sells a digital product or SaaS subscription → Becomes the legal seller: checkout, tax, VAT, fraud → Takes 5% + 50¢ of every transaction
The catch Thin layer on Stripe · no owned rails
Read the full teardown → - 24
Two church staffers fixed their Sunday-service chaos in 2006, then compounded 20 years of trust with no VC and no exit.
Church starts free: People database + Services planner → Adds paid apps as it grows: Giving, Check-Ins, Groups, Calendar → Monthly subscriptions + giving-processing fees across 90,000+ churches
The catch Bounded to churches; low ARPU by design.
Read the full teardown → - 25
He ran an $8M contracting firm on JobTread first. Builders buy from one of their own, not another software vendor.
Contractor subscribes at $199/mo base, all features in → Adds internal crew at $5-20 per user monthly ($4-16 on annual billing); subs and clients free → 7,500+ firms embed daily ops — sticky recurring MRR
The catch Crowded category; no VC to outspend rivals.
Read the full teardown → - 26
One AI-native PSA+RMM, not a bolted-together legacy suite, priced on an India cost base for small MSPs giants ignore.
MSP installs SuperOps agents across client endpoints → Runs PSA + RMM in one tool, dropping 10-15 others → MSP pays about $1.20-3 per endpoint, every month
The catch Legacy incumbents own the big MSP accounts.
Read the full teardown → - 27
Free GPL code for 20 years won trust and about 20,000 practices; painful data conversion now keeps them from leaving.
A practice installs Open Dental's PM software → It pays a monthly support fee, then adds eServices → Support + eServices fees recur across about 20,000 practices
The catch Just closed its 20-year open-source promise
Read the full teardown → - 28
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 → - 29
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 → - 30
Owns the device, software, install network and data, and runs it profitably, so it undercuts VC-funded rivals.
Install a Cartrack GPS unit in each fleet vehicle → Fleet runs daily on the SaaS platform: tracking, safety, jobs → Charge a low monthly per-vehicle subscription — 2.8M subs
The catch Hardware install caps SaaS-style margins.
Read the full teardown → - 31
Discovery is court-mandated. Every lawsuit and regulatory probe must review documents on someone's software.
A lawsuit or probe forces discovery → Legal team loads and reviews data in DISCO → DISCO bills by data, seats and AI review
The catch Revenue swings with the litigation cycle.
Read the full teardown → - 32
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 → - 33
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 → - 34
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 → - 35
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 → - 36
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 → - 37
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 → - 38
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 → - 39
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 → - 40
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 →
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.