Skip 4 weeks of backend plumbing. Reptron ships Auth, Supabase cloud sync, Cloudflare AI proxy with per-user quota, and 88 passing tests — ready to ship on day one. Built for dev-builders who want to launch a real AI fitness app, not spend months wiring infrastructure. Stack: Expo 54 · Supabase · Cloudflare Workers · Groq · TypeScript strict.