Atomic Fast is Live on the App Store

Atomic Fast is live on the App Store. It's free, it's ad-free, and it's the fasting app we wished existed.

Why We Built Atomic Fast

Most fasting apps are timers. Most calorie trackers are food diaries. They exist in separate worlds — even though fasting and nutrition are deeply connected.

What you eat affects how your next fast goes. How you fast affects what your body needs when you eat again. No app was connecting both sides.

Atomic Fast does.

What Makes It Different

Fasting Meets Nutrition

Atomic Fast is the first app that connects your fasting sessions with your meals. Log what you eat, and the app tells you how it affects your next fast. Break a fast, and it scores your first meal based on protein, fiber, and glycemic balance.

This isn't a timer bolted onto a food diary. It's a single system where fasting and nutrition inform each other.

AI-Powered Meal Logging

We built meal logging around speed. Snap a photo of your plate and get calories, macros, and nutrients in under 5 seconds — powered by Google's Gemini AI.

You can also:

• Describe what you ate in plain text
• Scan a barcode for packaged foods
• Scan a nutrition label directly
• Search the USDA database for manual entry

The goal: logging a meal should take less time than it takes to sit down.

Metabolic Phase Tracking

Every fast moves through biological stages — from digestion to fat burning to deep ketosis to autophagy. Atomic Fast visualizes this in real time with our signature ring interface, so you always know where you are in your metabolic journey.

7 On-Device Intelligence Engines

Behind the scenes, 7 engines analyze your data locally:

• Fasting patterns — streaks, consistency, optimal windows
• Nutrition timing — how meal timing affects your fasts
• Metabolic impact — how different foods affect your metabolic response
• Health correlations — connections between sleep, HRV, activity, and fasting success
• Break-fast scoring — rating your first meal after a fast
• Calorie trends — weekly patterns and macro balance
• Readiness scoring — a daily 0-100 score from 10 health signals

All processing happens on your device. No cloud dependency. No generic advice.

Apple Health Integration

Atomic Fast syncs 24 Apple Health data types — sleep, heart rate, HRV, steps, workouts, weight, and more. Your meals write 11 nutrients plus water back to Apple Health, keeping everything connected across your health apps.

What's Free

The free version is the real product:

• Full fasting timer with metabolic phases
• Manual meal logging and food search
• Readiness score and daily insights
• All themes and ring styles
• 7 AI meal scans per week
• No ads, ever

What's Next

We're already working on the next updates:

• iCloud backup — sync your data across devices
• Data export — CSV and JSON exports for your records
• Apple Watch — a companion app for quick fasting control
• Android — full parity coming soon

If you've been looking for a fasting app that actually understands nutrition, give Atomic Fast a try. We think you'll feel the difference.

Atomic Fast is available now on the App Store. Free to download.

Want to try Atomic Fast?