Updated 26 Oct 2026
Best AI stack for a habit tracker app
A phone app for iPhone and Android where people tick off daily habits, keep streaks and see their progress.
| Role | Tool & why | Price |
|---|---|---|
| Builder | Bolt.new Builds real mobile apps with Expo; preview on your own phone with the Expo Go app while you build. | Free (1M tokens/mo, 300K/day); Pro $25/mo or $18/mo billed annually (10M tokens); Teams $30/member ($27 annually) |
| Database | Firebase Habits, daily check-ins and streaks, with offline support on phones. | Free Spark plan; Blaze pay-as-you-go with free quotas (Firestore 1 GiB, 50K reads/day) |
| Login | Firebase Authentication Email, Google or Apple sign-in so habits sync across devices. | Free for email/social sign-in; 50K MAU free with Identity Platform; SMS billed per message |
| Analytics | PostHog See which habits people keep and where they drop off. | Free 1M analytics events + 5K session replays per month, forever |
Estimated cost at launch
~$33/mo (Bolt Pro $25 + Apple's $99/yr developer fee ≈ $8/mo) + $25 one-time for Google Play. Bolt's free tier can be enough for a small first version.
💡 Want to charge for premium features inside the app? Apple and Google require their in-app purchase systems for digital features, so plan for that before you add a paywall. A free first version is the easiest way to get through app review.
Copy-paste starter prompt
Build a habit tracker mobile app with Expo. Users sign in with Firebase Auth, add habits (name, emoji, days of the week), tick them off each day and see a current streak and a 30-day calendar for each habit. Save data in Firestore, with security rules so users only see their own habits. Add a simple stats screen and a daily reminder notification at a time the user picks.
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Prices checked on official pricing pages on 26 Oct 2026; confirm before buying. Some links may be affiliate links.