SaaS & apps
Solo developer income: micro-SaaS, browser extensions, mobile apps, AI-wrapper tools.
Solo developer SaaS is one of the most rewarding passive-income models for technical readers — and one of the most punishing for non-technical ones. The asymmetry: a working codebase compounds at near-zero marginal cost; a buggy or undifferentiated one rots fast.
The pillar covers micro-SaaS economics (what’s earning real money in 2026), browser extensions on Chrome/Firefox stores (still wildly under-saturated), mobile apps (the consolidation post-2020 reshaped the playing field), and the AI-wrapper apps boom + the cliff that ends most of them.
NOT here: “build a SaaS in a weekend” advice. Real SaaS is years of compounding, not weekends.
8 ideas
Browser Extension as Solo SaaS
One of the most underserved markets in 2026 — Chrome Web Store has 200M+ daily users and shockingly few quality paid extensions in any given vertical.
Niche Marketplace as a Solo Product
The highest-ceiling business model for solo builders — but with the slowest cold start. Most fail in the chicken-and-egg phase. The math when they don't is asymmetric.
Custom GPTs and AI agents as a paid product
Build, ship, and monetize custom GPTs / Claude Projects / specialized AI agents on existing marketplaces. The honest economics — when distribution is the moat, not the prompt.
API as a service — sell endpoints, not apps
Build a useful API, ship it on RapidAPI plus your own pricing page, and earn metered or subscription revenue from developers building on top of it.
Mobile app subscriptions (iOS / Android)
Native mobile app with IAP subscriptions — utility, AI wrapper, fitness, or productivity. Honest 2026 math on App Store economics and the niche-app operator who earns.
WordPress plugin business
Build and sell a paid WordPress plugin to the 40%+ of websites running WordPress. Recurring license revenue with a small, focused buyer audience and a durable technical moat.
Discord and Telegram bot SaaS
Build a bot that solves a specific problem for Discord servers or Telegram groups, charge server admins a monthly fee, scale through community word-of-mouth.
Buy a SaaS business
Skip the zero-to-MVP grind and buy a profitable micro-SaaS. Honest math on multiples, diligence, and the operating reality that drives most acquisitions in 2026.