Build-in-public notes from the one person making WatchMy.bike: why it exists, how it's put together, and what running it solo actually looks like.
There is no WatchMy.bike app in the App Store or on Google Play, and there isn't going to be one. Push notifications already reach your phone and your watch from a web app — here's what that buys you, and the three things it actually costs.
Every cyclist knows a chain wears out. Almost nobody can say when they fitted it or which one it was. That gap is why I built WatchMy.bike.
I tracked every watt and interval, but had no idea how many km were on my chain. The story of how a personal ride site slid into a component tracker.
Cloudflare Workers, Supabase, webhook-first Strava sync with a 6-hour cron backstop, and MCP for AI assistants. The architecture one person can actually run.