What it is
Micro-SaaS is a small niche paid product (often under 5,000 lines of code) that a solo founder builds fast — ideally over a weekend — with AI. The sweet spot: $5k–50k MRR with a team of one or two.
Where it came from
Indie-hacker culture (Pieter Levels and others) has always been there, but vibe-coding in 2024–25 (Cursor, v0, Lovable, Replit Agent) removed the technical barrier: you describe the product in a prompt instead of writing it line by line. Idea to deploy in days.
Why it took off
Stripe: the median time to first dollar dropped from 14 weeks (2021) to under 3 weeks. According to an Indie Hackers report, 340+ solo SaaS products crossed $100k ARR in a year — most of them under 5,000 lines of code. The micro-SaaS market grows roughly 30% a year. The barrier to entry has all but vanished.
How to apply it now
- Solve one sharp pain for a narrow audience (not "a Notion killer", but "X for Y").
- Build the MVP on a vibe-coding stack, wire up Stripe, and ship to production over the weekend.
- Distribution matters more than the code: find where your niche actually lives (Reddit, X, specialist communities).
- Track "time to first paying customer", not lines of code.
What to watch out for
A low barrier means high competition and easy copying. Technical debt from prompted-into-existence code surfaces at scale (security, performance). Audit generated code before you take payments or store personal data.