Single HTML File Personal App Marketplace With Optional Cloud Sync Built In
A growing camp of indie hackers argue that 90% of the personal apps people actually use (workout log, pomodoro, expense tracker, habit tracker, mood journal) are 90% UI and 10% data. The infrastructure stack of React plus Supabase plus auth plus deploy that everyone reaches for is wildly overengineered. The opening is a marketplace of single-HTML-file personal apps (think 1990s shareware) that works offline by default, with one-click optional encrypted sync via a tiny shared backend.
Don't try to be a developer platform. The audience is end-users who buy a $4 HTML file and run it off their Dropbox. The bundled sync is the moat (encrypted, end-user-pays-pennies, capped at 1MB per app). Builders will come because the sync layer makes their app actually monetizable. The trap is over-spec-ing the runtime, do not invent a framework.
landscape (3 existing solutions)
This is positioned uncomfortably between 'static site generator' and 'app store'. Nobody owns it. The closest spiritual predecessor is the iOS App Store circa 2009: lots of $0.99 single-purpose tools that real people used.