A little clarity goes a long way.

Yes. Barcode scanning, food search, full macros, weight trends, and Apple Health sync are included without a subscription. Calvin Plus is optional and adds features such as AI meal-photo scanning.

No. Start using Calvin without signing up. Sign-in is optional, and it does not currently back up or restore your food log.

Barcode scanning is free and unlimited. AI meal-photo estimates require Calvin Plus. Always review the foods and portions before saving: the results are estimates, not exact measurements.

Yes. Calvin connects to Apple Health with your permission and shows calories and macros on Apple Watch. The watch displays your day and syncs with your nearby iPhone; use your phone to log meals.

Your food log stays on your iPhone. Some optional features—such as food lookups, photo analysis, and connected services—send the data needed to work. The privacy policy explains each one.

The listed USD price is $9.99 per month or $49.99 per year. A 3-day trial is offered to eligible subscribers. Confirm your local price and terms in the App Store before subscribing.

No. Calvin is available for iPhone and Apple Watch. This website introduces the app and hosts its guides; it is not an in-browser food diary.

On your iPhone, open Settings, tap your name, then Subscriptions. Select Calvin to manage or cancel renewal. Deleting the app does not cancel a subscription. Visit Support for more help.

Signing in is not a backup. Keep iCloud device backup enabled or export a CSV from Settings. Deleting the app removes its local storage.