Fasting Tracker: Jeûne long

Information

The project

Fasting Tracker is a complete application for tracking intermittent and extended fasts (16:8, OMAD, 2-5 day fasts). The app helps users stay consistent with real-time timers, reminders, and science-based data on ketosis and autophagy phases.

The app features: • Popular fasting plans (16:8, OMAD) and custom schedules • Real-time tracking of fasting and eating phases • Support for extended fasts (2, 3, 5+ days) • Estimated time in ketosis and autophagy • Complete history with duration and timestamps • Detailed statistics for progress tracking • Optional notifications for each phase • Heart coherence and breathing module with animated visual guide • Offline functionality with automatic sync

My contribution

• Development and integration of a complete heart coherence/breathing module • Implementation of an animated rosace with Reanimated (expansion, pause, retraction) • Synchronization of multiple states: animation, timer, audio, flash, vibrations • Advanced configuration page with breathing presets and customizable parameters • Audio integration for Tibetan gong sounds at each breathing phase • Implementation of haptic feedback and flash synchronization • Text-to-speech system for voice guidance • Precise timing management for breathing coherence exercises • Local data persistence with AsyncStorage

Technical challenges overcome: • Complex state management for pause/resume with preserved animation state • Precise synchronization between visual animation, audio, haptics and timer • Native build configuration (Xcode) for React Native CLI • Smooth Reanimated animations with intermediate state preservation on pause • Resume logic maintaining exact progress (rosace position + remaining time) • Multi-sensory experience: visual (animation + flash), audio (gong), tactile (vibration) • Seamless integration as a standalone tab in the bottom navigation

The technologies and tools used

Results

• Successfully delivered a highly anticipated feature requested by the client • Complete breathing coherence module integrated as a standalone tab • Smooth and precise animations with Reanimated for optimal user experience • Multi-sensory guidance system (visual, audio, haptic) for breathing exercises • Robust pause/resume system maintaining exact animation and timer state • Feature replicated from client's successful app with proven user engagement • Enhanced the health & wellness offering of the fasting tracker

Image gallery