Atomic Fast: Fasting & Diet

Snap a photo of your meal to estimate calories, macros, and nutrients in seconds. Track your fasts. See how your eating patterns, hydration, sleep, and activity connect over time.

AtomicFast combines intermittent fasting, AI calorie tracking, macro counting, Apple Health insights, and hydration tracking in one app — made for people who already fast and want more than just a basic timer or food diary.

FASTING TIMER WITH METABOLIC PHASES

Track your fasts with a real-time fasting timer and estimated metabolic phase guidance. Follow your progress through clear visual stages, from digestion and transition to glycogen depletion, fat burning, deeper fasting, and autophagy. Tracking your fast is easy, zero hassle.

Choose popular fasting schedules like 16:8, 18:6, 20:4, OMAD, or create your own custom plan. Adjust your goals anytime, and get fasting milestone notifications without the pressure.

AI CALORIE TRACKING IN SECONDS

Take a photo of your plate. AtomicFast typically identifies foods in under 5 seconds and estimates calories, macros, and nutrients — like a smart AI calorie counter and macro tracker that actually understands what you ate.

You can also log meals by:
- Describing what you ate with text or voice
- Scanning nutrition labels
- Scanning barcodes
- Searching the USDA food database
- Adding meals manually when needed

No more typing one ingredient at a time just to understand what you ate.

BREAK-FAST SCORE

The first meal after a fast matters. AtomicFast scores your break-fast meal from 0 to 100, with practical suggestions on protein, fiber, carbs, and balance for a smoother transition back into eating.

MEALS AND FASTS THAT WORK TOGETHER

Most fasting apps track time. Most calorie trackers and food diaries track food. AtomicFast connects both.

See how your last meal affects your next fast, how your fasting consistency affects your eating patterns, and how nutrition timing may connect with sleep, recovery, and daily energy.

METABOLIC INSIGHTS

AtomicFast helps you spot patterns across fasting, meals, hydration, sleep, heart rate, HRV, activity, and more.

Interactive charts and daily insights help you understand habits like calorie trends, macro balance, fasting consistency, and how nutrition timing may connect with sleep, recovery, and energy levels.

Daily insight examples:
- "Ending eating by 7 PM dropped your sleeping heart rate by 4 bpm last week"
- "On high-recovery days you hit your fasting goal 30% more often"

Insights are calculated on your device. Your patterns stay yours.

DAILY READINESS SCORE

Wake up to a readiness score from key health signals: sleep, HRV, resting heart rate, activity, exercise, and respiratory rate.

A simple guide to whether today is a good day to push your fast, stay normal, or focus on recovery.

APPLE HEALTH AND APPLE WATCH

AtomicFast syncs 24 Apple Health data types: sleep, heart rate, HRV, steps, workouts, weight, respiratory rate, and more.

Meals write 11 nutrients plus water back to Apple Health, keeping your nutrition data connected across your favorite health apps.

HYDRATION TRACKING

One-tap water logging. Smart reminders that fit naturally around your fasting routine.

BUILT FOR EVERYDAY USE

- Three themes including a signature Deep Purple mode
- Two timer styles: Atomic Ring and Classic Ring
- Smart notifications for fasting milestones, hydration, meal reminders, and weekly recaps
- Awards and streaks to celebrate progress without pressure
- Offline-first experience
- Privacy-focused design
- Apple Watch companion app

ATOMIC+ SUBSCRIPTION

The free version is the real product — fasting tracking, manual food logging, readiness score, daily insights, themes, and 7 AI meal scans per week, all free and ad-free.

Atomic+ unlocks:
- Unlimited AI meal scans
- iCloud backup and data export

Available as Atomic+ Monthly, Atomic+ Annual (with 7-day free trial), or Atomic+ Lifetime.

Terms of Use: https://atomicfast.com/terms
Privacy Policy: https://atomicfast.com/privacy