Fast36 vs CaloBurner

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

I lost 12kg of fat in 2.5 months, from 28% body fat down to 15%, while traveling through Southeast Asia. No gym membership. No fad diet. Just a consistent calorie deficit, tracked every single day. CaloBurner is the app I built from that experience. The calorie tracker that was built for real weight loss. CaloBurner combines AI meal logging, macro tracking, and a built-in step counter into one focused app. It calculates your TDEE, sets a safe calorie deficit, and gives you the tools to actually stick to it, whether you're at home or eating street food in Chiang Mai. HOW IT WORKS CaloBurner starts with your body stats and goal. It calculates your Total Daily Energy Expenditure (TDEE), then sets a personalized calorie deficit that's aggressive enough to see results but safe enough to sustain. No crash diets. No 1200-calorie starvation plans. Just science-backed targets based on your metabolism. AI-POWERED FOOD SCANNER Snap a photo of any meal and get an instant calorie and macro breakdown. Add context like "this is a large portion" or "no dressing" to improve accuracy. The AI calorie counter handles restaurant meals, home-cooked plates, and packaged foods, so logging takes seconds, not minutes. MACRO TRACKER THAT KEEPS YOU HONEST Track protein, carbs, and fat alongside your calories. CaloBurner shows your remaining macro budget at a glance, so you always know what to eat next. During my own cut, checking my protein tracker 3-4 times a day kept me on target when it mattered most. BUILT-IN STEP COUNTER Most nutrition trackers ignore the simplest way to burn more calories: walking. CaloBurner has a built-in step counter that syncs with Apple Health, so you can see your calories and steps in one place. No need for a separate pedometer app. Steps were my primary activity driver during my entire fat loss journey, and they work. QUICK ADD FOR YOUR GO-TO MEALS Save meals you eat regularly and log them with a single tap. Whether it's your morning oatmeal or a favorite lunch spot order, Quick Add removes the friction from daily calorie counting. PROGRESS TRACKING AND STREAKS Watch your weight loss trend over time with clear charts. Track your logging streaks to build the daily habit that makes calorie tracking work. Consistency is what separates people who lose weight from people who just download weight loss apps. YOUR PERSONALIZED PLAN Every plan is built from your TDEE calculation, accounting for your age, weight, height, activity level, and goal. CaloBurner adjusts your calorie and macro targets so your nutrition plan fits your life, not the other way around. WHAT MAKES CALOBURNER DIFFERENT This isn't another generic food diary. I built the first version as a web-based calorie deficit tracker and used it daily throughout my own transformation. Every feature exists because I needed it: the AI food scanner for unfamiliar meals abroad, the step counter because walking was easier than the gym, the macro tracker because hitting my protein goal was the hardest part. CaloBurner is a complete fat loss toolkit, not a calorie counting spreadsheet. IMPORTANT CaloBurner is designed to support healthy, sustainable weight loss. It is not a substitute for professional medical advice. If you have a medical condition or eating disorder, please consult a healthcare professional before starting any calorie deficit plan. Safe, gradual progress beats rapid weight loss every time. Start your calorie deficit today. Download CaloBurner and see what consistent tracking can do. Disclaimer: CaloBurner provides general wellness information and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider before starting any diet or exercise program and before making any medical decisions. Terms of Use: https://caloburner.app/terms Privacy Policy: https://caloburner.app/privacy