# FitSync

**Canonical page:** <https://www.devarps.com/case-studies/7>  
**Category:** Mobile App  
**Client:** FitSync LLC  
**Timeline:** 6 Months  
**Role:** Mobile Engineering

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## Summary

Cross-platform fitness app that aggregates data from Apple Watch and Fitbit into a single health dashboard.


**Highlights:**
- Downloads: 100k+
- Active: 25k


## Challenge

Users have health data scattered across Apple Health, Google Fit, and FitBit. The client wanted a 'Single Source of Truth' app that aggregated everything into one dashboard.

## Solution

We utilized React Native to build a cross-platform app. We wrote native bridges (Swift/Kotlin) to access HealthKit and Google Fit APIs efficiently. We implemented a local database (Realm) to ensure the app works perfectly offline.

## Results

- **Downloads:** 100k+
- **DAU:** 25k
- **Sync Speed:** <2s
- **App Rating:** 4.8

## Tech stack

React Native · HealthKit · Realm DB · Node.js · GraphQL

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