Atomic Fast: Fasting & Diet

Atomic Fast: Fasting & Diet

AI Calorie & Meal Tracker

26 ratings
22 reviews
Free
In-App Purchases

Details

  • Released
  • Updated

Features

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About

This app combines intermittent fasting with AI-powered calorie and macro tracking. It analyzes your eating patterns, hydration, sleep, and activity to provide metabolic insights and a daily readiness score. Seamlessly integrates with Apple Health for a holistic view of your well-being.

AI calorie and macro estimation from photos
Intermittent fasting timer with metabolic phases
Break-fast meal scoring and suggestions
Connects meals and fasts for holistic insights
Daily readiness score based on health signals
Apple Health and Apple Watch integration
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+2

What's New in Atomic Fast

1.2.1

July 16, 2026

This update is all about reliability. Your stats no longer briefly show zero after signing in, and your display name no longer disappears after email sign-in. Signing in with email now works dependably even if you've been away a while, and your fasting activity syncs more reliably when you switch away from the app. Plus a batch of under-the-hood improvements.

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Subscription plans

Atomic+ Monthly

Unlimited AI meal scans and premium features

$4.991 Month
How to cancel Atomic Fast subscription ⁉️
3

In-App Purchases

$59.99

Atomic+ Lifetime

One-time purchase. Unlimited AI meal scans and all.

Events

Read more about Cloud Backup & Sync

Cloud Backup & Sync

Your fasting data, safe across all your devices.

May 13, 2026 Jun 13, 2026

User reviews

Calorie logging feels effortless

I usually don’t enjoy logging calories because it feels like extra work, but Atomic Fast makes it easier. It’s simple enough to use every day without getting tired of it.

Smooth meal and calorie tracking

The calorie tracking experience is one of the best parts of Atomic Fast. Logging meals feels quick and it helps me stay aware of what I eat while keeping my fasting routine on track. Great app for fasting and mindful eating.

Atomic Fast has been a great app for keeping my fasting routine consistent.

The interface is clean, the fasting timer is easy to manage, and the meal tracking features are surprisingly useful. I also like the hydration reminders and simple progress visuals. Everything feels smooth and well organized without being overwhelming.

Response from developer

Thank you so much! We’re really glad Atomic Fast is helping with your fasting routine. We designed the fasting timer, meal tracking, hydration reminders, and progress visuals to make intermittent fasting and healthy habit tracking feel simple, smooth, and easy to follow.

Amazing Fasting Tracker

I’ve tried a few fasting apps
before, but Atomic Fast feels much more polished and easier to stick with. The fasting tracker is straightforward, and I appreciate how it combines fasting, calories, meals, and hydration in one app. It’s simple enough for beginners but still useful for daily habit tracking.
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Response from developer

Thanks for the amazing review! We’re happy to hear Atomic Fast feels polished and easy to stick with. Our goal is to bring fasting tracking, calorie tracking, meal logging, hydration, and daily habit tracking together in one simple app for both beginners and regular fasters.

Simple and effective diet app

This app has a very smooth and professional feel. Starting and ending fasts is simple, and the meal tracking features help me stay more mindful about what I eat. The fasting progress visuals are also really motivating. Overall, it feels reliable and thoughtfully diet designed.

Response from developer

Thank you! We’re glad you’re enjoying the smooth experience. Atomic Fast is built to make starting and ending fasts easy while helping with meal tracking, mindful eating, hydration, and motivating fasting progress visuals. Appreciate your support!

FAQ

What is Atomic Fast?

Atomic Fast is a health and fitness app that combines intermittent fasting tracking with AI-powered calorie and macro counting. It helps users understand how their eating habits, fasting schedules, and daily activities connect to their overall metabolic health.

How does Atomic Fast track calories?

Atomic Fast uses AI to estimate calories, macros, and nutrients by analyzing a photo of your meal, typically in under 5 seconds. You can also log meals by text, voice, scanning barcodes, or searching a database.

What fasting schedules does Atomic Fast support?

Atomic Fast supports popular fasting schedules like 16:8, 18:6, 20:4, and OMAD, and also allows users to create their own custom plans. It provides a real-time timer and guidance on metabolic phases.

Does Atomic Fast integrate with Apple Health?

Yes, Atomic Fast syncs with Apple Health, importing 24 data types including sleep, heart rate, HRV, steps, and workouts. It also writes meal and water data back to Apple Health.

What is the Break-Fast Score?

The Break-Fast Score is a feature that evaluates your first meal after a fast on a scale of 0 to 100. It offers practical suggestions for protein, fiber, and carbohydrate balance to aid in a smoother transition back to eating.

How does Atomic Fast provide metabolic insights?

Atomic Fast helps you spot patterns by connecting your fasting, meals, hydration, sleep, heart rate, activity, and more. Interactive charts and daily insights highlight trends in calorie intake, macro balance, and how nutrition timing affects sleep and energy.

What are the subscription options for Atomic Fast?

Atomic Fast offers 'Atomic+ Monthly' for $4.99 per month and 'Atomic+ Annual' for $29.99 per year. The annual plan includes a 7-day free trial.

Is Atomic Fast suitable for beginners?

Atomic Fast is designed for people who already fast and want more than a basic timer or food diary. Its comprehensive features and insights may be best suited for users with some experience in intermittent fasting and dietary tracking.