How can we help?

Calorie Gap detects missing resting energy (basal calorie) data in Apple Health. Devices like Apple Watch sometimes fail to record every hour — especially overnight while charging — leaving gaps that throw off your daily calorie totals. Calorie Gap finds those gaps, estimates the missing calories, and writes them back to Health so your daily totals are accurate.

It looks at your recent resting energy burn rates — particularly the hour just before a gap — and uses that as the basis for an estimate. During sleep hours it can use a lower sleep burn rate instead. You can fine-tune the estimation behaviour in Settings.

No. All processing happens entirely on your device. Calorie Gap reads and writes data through Apple Health and never sends your health information to any external server.

The 14-day free trial gives you full access to every feature, including gap detection, automatic and manual gap filling, and notifications. After the trial you can unlock permanent access with a one-time purchase.

Yes. Tap on any filled gap in the timeline to see its details, then use the undo action to remove the data that was written to Health. The gap will reappear so you can re-fill it if needed.

Calorie Gap needs read and write access to Resting Energy in Apple Health — read to detect gaps and write to fill them. It also asks for optional read access to Dietary Energy. This isn’t used for calorie calculations, but it lets the app wake up in the background when you log food, which makes automatic gap filling and notifications more reliable. Health data is normally inaccessible while your device is locked, so this extra trigger helps the app catch gaps sooner. You can manage all permissions in the Health app under Data Access & Devices.