32 of 406 ideas

Open-source self-hosting as the top of the funnel, the cloud-hosted version as the paid tier — 21K GitHub stars carrying $9K MRR

A browser-automation SaaS as the center pole, fed paying users by a cluster of tiny tool sites

A Japanese freelancer scratched his own invoicing itch in PHP, gave it away free until 10,000 people used it, then switched on ¥980–¥3,000 plans and collected ¥100K–¥120K a month for years before selling the whole thing

Analytics and client reporting built for email/SMS marketing agencies instead of the brands they serve — one sale onboards 30 brands at once

He bought a dying five-year-old SEO tool for $30,000 doing $1,500/month, spent two months fixing retention instead of marketing, and took it to $30,000/month with two contractors and no employees

An ad-attribution tool taken to a reported $40M ARR with no outside funding — by giving the software away free to the first thirty customers, installing it for them by hand, and trading results for testimonials before ever sending an invoice

A non-developer built a SaaS in Bubble, took it to $10-11K MRR in his first year, tried to sell it to private equity for $112K — and concluded that the acquisition failed partly because his growth came from twelve burner TikTok accounts instead of an ad account.

A Chrome extension clones your app's front end into a clickable demo you can embed anywhere — $250K MRR in two and a half years by ranking for every competitor's name.

A form builder that gives away 99% of its features with no limits, then converts about 3% of 140,000 users at $29/month — $70K MRR on a team of four, built by out-positioning Google Forms and Typeform instead of out-spending them

A single-platform social tool that hit $1K MRR in two weeks and $300K/month by giving a quarter of its profits to one creator as head of distribution

A $100/month waitlist-and-reservations app for restaurants that undercuts OpenTable and Yelp by refusing to charge cover fees

A local-only desktop app that turns a Korean school counsellor's three hours of monthly paperwork into ten minutes — ₩20M a month from under 100 schools, built solo with Replit and Claude Code

A French search API that grew from $12K MRR to 250 staff while its first business hire sold American enterprises from Paris using +1 415 phone numbers, midnight calls with the camera off, and a quarter spent on exactly thirty accounts

A corporate data analyst built the tool his employer refused to build, sold it back to his employer as customer number one, and exited at nearly 10× revenue five years later

Construction management software for residential builders — $2M ARR and $40K a month of profit, with 95% of revenue traced back to long-tail blog posts

A kanban layer on top of GitHub Issues, built on nights and weekends, listed with a broker in mid-May and sold for its full $128,000 asking price by mid-June

Post once on your favourite platform and it syncs everywhere else — a solo build that went from concept to paying customers in a week and reached $716 MRR in three months, marketed entirely by LinkedIn posts and replying to whoever liked them

A Vietnamese-built test-automation platform that spent three years not charging anyone, then used pure self-service to reach 65,000 business customers in 160 countries without hiring a sales rep in any of them

Software for nurseries and preschools started by a 19-year-old in his mother's daycare — over 20 million złoty in revenue, half a million parents, and one in three Polish parents with a child in private childcare

Two lazy engineers automated the part of GitHub that GitHub wouldn't build, gave it free to open source, and now bill 150 engineering teams ~$750/month each — $110K/month, bootstrapped

A dermatologist built the software her own telederm clinic runs on, then started licensing it to other doctors — the clinic bills $150K/mo and pays the software company half of it

A second-time French founder walked into 20 factories, got 19 nos, and turned the one yes into eight separate software companies doing €2.2M a year across 180 factory sites — sold almost entirely through 100 tiny consultancies on commission

Upload a podcast episode, get the show notes, newsletter and social posts back — a two-week build that reached $16K MRR after four earlier products went nowhere

A non-technical Dutch employee got so annoyed at the vendor issuing his field technicians' parking exemptions that he took the job over himself — Google Forms and a PowerPoint website first, Bubble and Stripe later — and quit his consulting work at 10K a month

A Japanese restaurant reservation platform that wins deals by telling restaurants their current vendor is holding their customer data hostage — and lets anyone export everything, any time, with no contract lock

Take a tool that agencies sell for ¥100K a month, sell it to sole traders for ¥5K, then pay your three free beta users ¥5,000 a head to sell it for you — the exact sequence that took a Japanese solo dev to ¥200K/month