Fast36 vs Intermittent Fasting

Stages, not streaks. Fast36 is the fasting app for people who care about the metabolic arc, not the calendar grid. Track the biochemical progression of a 24 to 72+ hour fast with phase-aware timing, in-the-moment science, and a private record of every session. WHAT YOU GET • Stage-aware timer. Watch your fast move through the four metabolic regimes — glycogen depletion, ketosis, autophagy, deep autophagy — with color-coded thresholds that match real human physiology. • Quick Log for ketones and glucose. Pair every fast with a finger-stick reading. Build a longitudinal record of how your biomarkers respond to each protocol. • Live Activity on the Lock Screen. Current stage, elapsed time, and next threshold — always one glance away. No need to open the app. • Apple Watch companion. Start, monitor, and end fasts from your wrist. Phone, iPad, and watch always show the same session. • History with substance. Total hours, per-stage distribution, per-fast gantt, readings, notes. No streaks. No flame emoji. No celebratory confetti. • The Science reference. Peer-reviewed citations for every stage claim. We tell you what's proven in humans and what's extrapolated from rodent studies, and when evidence is emerging rather than settled. FREE • 36-hour protocol — the namesake fast • Stage-aware timer and Stages reference • History log and HealthKit integration • On-device privacy FAST36 PRO — $14.99 / month or $99 / year • 24-hour reset fasts • 48-hour and 72-hour extended protocols • Custom fast lengths • Live Activity with stage transitions • Stage-crossing haptics • Apple Watch companion • Quick Log for ketones and glucose • Full history analytics and stage distribution chart • Notes on every fast • Apple Health bidirectional sync • The Science deep-dive with citations WHO IT'S FOR Biohackers running 24 / 36 / 48 / 72-hour protocols. People who want their fasting app to read like a lab notebook, not a game. Anyone who has ever said "autophagy" at dinner and meant it. Not for calorie counting, not for weight-loss streaks, not for "gamified wellness." PRIVACY All fasting data lives on-device. Optional Apple Health sync stays between you and Apple — it does not pass through our servers. No accounts, no newsletters, no behavioral tracking, no third-party analytics. Not medical advice. Extended fasting carries real risks for people with diabetes, eating disorder history, pregnancy, low body fat, or on medications affecting blood sugar or blood pressure. Consult a clinician before attempting any fast over 24 hours. Fast36 Pro subscriptions renew automatically unless cancelled at least 24 hours before the current period ends. Manage or cancel from your Apple ID settings. Terms of Use: https://fast36.app/terms Privacy Policy: https://fast36.app/privacy Support: hello@fast36.app

Burn is an intermittent fasting tracker that shows exactly what your body is doing, hour by hour. Start a fast in one tap and watch fat burning, ketosis and autophagy arrive in real time. WHAT MAKES BURN DIFFERENT Most fasting apps give you a countdown. Burn gives you the biology behind it. As your fast progresses you can see glycogen dropping, fat burning starting, ketosis beginning and autophagy switching on. When you can see the stages, every hour feels earned. SEE EVERY FASTING STAGE Follow your fast through Fed, Catabolic, Fat Burning, Ketosis and Autophagy on a live timeline, so you always know where you are and what comes next. Stages are educational estimates built to keep you motivated and consistent. ONE SCORE FOR EVERY FAST Body Score combines your fasting consistency and your weight trend into a single number. Instead of judging progress by the scale alone, you get a clearer view of whether your routine is actually moving in the right direction. EVERY PLAN, FROM BEGINNER TO ADVANCED 16:8 to start and learn the rhythm 18:6 and 20:4 when you are ready to go deeper OMAD for one meal a day Extended and open-ended fasts with no time cap Custom windows for any schedule that fits your life ALWAYS IN VIEW Home Screen and Lock Screen widgets Live Activities and Dynamic Island Apple Watch app and complications Smart notifications at the moments that matter HealthKit sync and iCloud backup Dark Mode TRACK WHAT CHANGES Log your weight, review every completed fast, build streaks, hit personal records and watch your trends over weeks and months rather than days. FREE TO START The core fasting timer is free with no usage limits. Burn Pro unlocks Body Score, Apple Watch, widgets, advanced insights and analytics, history editing, progress trends and personal records. Whether this is your first 16:8 or your fiftieth extended fast, Burn stays out of the way and lets the timer do the talking. Download Burn and start your next fast. IMPORTANT INFORMATION Burn is a health and fitness tracking tool. It does not provide medical advice, diagnosis or treatment. Fasting stages, insights and health information are educational estimates only. Speak with a qualified healthcare professional before starting a fasting routine, especially if you have a medical condition, are pregnant, underweight, have a history of eating disorders, or take medication. Privacy Policy: https://wraithbit.com/burn-privacy-policy/ Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Download Burn and start your next fast.