Cardia Fast

**Cardia Fast** turns intermittent fasting into metabolic science. Track your fasts through 5 research-backed zones, align with your circadian rhythm using sunset detection, and learn what's happening in your body at every stage. **Solar Dial Timer** A beautiful 24-hour ring shows your fasting progress in real time. Watch your zone change from Fed → Fat Burning → Ketosis → Autophagy → Deep Autophagy as your fast progresses. **5 Metabolic Zones** Not all fasting hours are equal. Cardia Fast tracks the metabolic stage of every fast — so you know exactly when your body starts burning fat, entering ketosis, and triggering autophagy. **Circadian Mode** Fast with the sun. Enable sunset-aware fasting and let Cardia Fast calculate your optimal eating window based on your local sunset time — the way your body was designed to eat. **Morning Debrief** Start each day with a personalized summary — your streak, last fast duration, zone reached, and a motivational message to keep you going. **Fasting Score** Get a weekly score (0–100) based on consistency, duration, and depth. See exactly where you're excelling and where you can improve. **12 Achievement Badges** Unlock milestones like First Fast, Week Warrior, Fat Burner, Autophagy Ace, and more. Track your progress without cartoon gimmicks. **PRO FEATURES** Unlock Circadian Coach tips, pattern analysis, weight correlation charts, weekly summaries, micro-journaling, vacation mode, and data export — all with a single subscription. **CARDIA COMPLETE** Access all Cardia apps with a single subscription — Heart, Mind, Sleep, Steps, Hydrate, Fast, and more. One ecosystem for your complete wellness journey. **PRIVACY FIRST** All health data stays on your device. No accounts required. No data leaves your phone. Download Cardia Fast and start fasting with the science. Terms of Use (EULA): https://keendigital.co/#/terms Privacy Policy: https://keendigital.co/#/privacy