Atomic Fast is Live on the App Store

Atomic Fast launched on the App Store on May 6, 2026. We built it to keep a fasting timer and a meal log in one place, with a small native app and no ads.

This announcement preserves that launch milestone. The feature notes below have been checked and clarified as the app has developed. Android is now available too.

Why we built Atomic Fast

A fasting timer records when you stop eating. A food log records what you eat. We wanted those records together so you could review the two parts of your day without maintaining separate diaries.

That does not mean a phone can work out exactly what is happening inside your body. The useful part is having an accurate record and being clear about what the app estimates.

A timer with context

The timer counts from the start you choose. Its ring changes as time passes, with phase labels and explanations available along the way.

Those labels use fixed elapsed-hour thresholds. They are not measurements of glucose, ketones or autophagy, and logging a different meal does not move the boundaries. Our explanation of how the timer shows metabolic phases covers that distinction.

You can use the timer without logging food. Starting, timing and saving a fast are free, and the timer works offline.

Several ways to log a meal

You can photograph food, type a description, scan a barcode, photograph a nutrition label or use food search. Check the proposed foods and portions before saving: AI nutrition values are estimates, and processing time depends on the connection and request.

The free plan includes seven successful AI scans per week. Barcode lookup, database search and manual food entry are separate from that allowance. AI scans, food search and barcode lookups need an internet connection.

Once you use both fasting and meal logging, today’s timeline can show the records together. The app also estimates a digestion-complete time from a logged meal. That estimate does not start a fast or measure digestion.

What stays on your phone

The timer and local records work on the device. Optional AI logging sends the photo or typed description through our server to Google’s Gemini API to estimate nutrition. We do not store that request content; Google’s own policy covers its processing.

Optional subscriber cloud backup is another distinct feature. Local operation should not be read as a promise that every function is offline or that no data ever leaves the phone. The privacy policy explains those boundaries.

Since the launch

Android has joined iPhone, and backup and export have their own controls. See the Android launch announcement for that milestone and our backup and export overview for the distinction between a backup and an export. Neither should be mistaken for continuous cross-device sync.

The aim is still straightforward: make recording a fast and a meal easy enough to keep doing, without presenting an estimate as a health measurement.

Sources and product notes

Product information checked: October 11, 2026.

Product verification: The timer, phase thresholds, logging methods, scan allowance and optional backup were checked against app code and product documentation. Launch timing is the original publication record. This is a product announcement, not a clinical study. The privacy policy explains AI processing and optional cloud services.

Atomic Fast is available on the App Store and Google Play. Free to download, with optional paid features.