AppMatic Tech migrates wearable and fitness apps from the legacy Fitbit Web API and Google Fit APIs to the Google Health API and Android Health Connect, including Google OAuth 2.0 rework, user reconnection flows, and data parity checks. Built with Kotlin, Swift, Flutter, and Node.js from Ahmedabad, India.
The Fitbit Web API is being deprecated in September 2026 and Google Fit APIs are supported until the end of 2026. AppMatic Tech audits every integration point, migrates it, and runs old and new paths in parallel before cutover.
Mobile App Development Stack for Wearables
| Layer | What AppMatic Tech uses |
|---|---|
| Cloud access | Google Health API with Google OAuth 2.0 |
| On-device access | Android Health Connect |
| App layer | Kotlin, Swift, or Flutter adapters behind one data model |
| Backend | Node.js or Laravel token and sync services |
| Verification | Parallel run with total comparison before cutover |
How AppMatic Tech Delivers This
- Inventory every call to the Fitbit Web API and Google Fit.
- Map each data type to its replacement and note gaps.
- Implement Google OAuth 2.0 and a user reconnection prompt.
- Backfill history where the new API allows it.
- Run old and new in parallel, compare totals, then cut over.
Frequently Asked Questions
- Do users need to reconnect their accounts?
- Yes. The Google Health API uses Google OAuth 2.0, so existing Fitbit tokens do not carry over and AppMatic Tech builds a reconnection prompt into the app.
- Which API replaces Google Fit?
- Google recommends Health Connect for mobile-first apps reading on-device data and the Google Health API for companion apps and web platforms that need cloud access.
- How is data parity verified?
- AppMatic Tech runs the legacy and new integrations in parallel and compares daily totals per data type before switching off the legacy path.
Further reading: HealthKit vs Health Connect vs Google Health API: Which Health Data Platform a Wearable App Should Use