Tribe Tracker

Tribe Tracker is a React Native app where you create habit challenges, invite your people, and compete on points, streaks, and leaderboards, with an AI coach that reads your actual check-in data and tells you what to fix this week. Habit apps are easy; habit apps that work offline, sync a group leaderboard, run real-time chat, and coach you honestly are not.

The coaching pipeline is the part I'm proudest of. The backend assembles each user's last 14 days of per-habit check-ins, streak math, and leaderboard position into a structured prompt; GPT-4o-mini returns a JSON synopsis that is schema-validated against the input (IDs must match; malformed items are dropped). The result is specific: which habit is slipping, whether the leaderboard gap is mathematically closable in the days remaining, and one concrete ask for the week.

If the model is unavailable, a deterministic stats-based fallback produces the same shape from the raw numbers, so coaching never silently fails. A Vercel Cron job posts an AI-written Monday recap into each active challenge's group chat.

Every action applies optimistically through Redux and persists to AsyncStorage immediately; a custom sync middleware pushes changes in the background, queues failures, and retries with exponential backoff. On top of that: real-time group chat per challenge (Supabase postgres_changes with a polling fallback), DMs with a request/accept flow, typing indicators, read receipts, and deep-link invites.

• Light/dark/system theming with an animated tab-bar indicator
• Badges and level progression tuned to reward consistency
• Onboarding wizard that ranks public challenges against stated goals
• Local push for reminders and streak warnings; email via Supabase Edge Functions