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Go to your profile or goals screen, tap the calorie or macro you want to change, and enter a new value (in grams or as a percentage split). Save, and your daily rings update immediately. There is no charge to change your goals — ever.

Tap the add (+) button and choose Scan. Point your camera at the product barcode. Macronaut looks it up in the Open Food Facts catalog (with USDA generic foods as a fallback), shows the nutrition, and lets you adjust the serving size before logging.

Tap the add (+) button and choose Photo. Capture or pick a picture of your meal. Macronaut estimates the foods and macros and shows you the result, which you can edit before saving. Photos are sent only to generate the estimate and are never used to train AI models.

Tap the add (+) button and choose Voice, then just say what you ate — for example, “two eggs, a slice of sourdough, and a black coffee.” Macronaut transcribes it, parses each food, and logs the macros. Review and edit before saving. Audio is processed only to create the log and is never used for training.

During setup, or later in Settings, grant Macronaut access to Apple Health. Macronaut reads your steps, workouts, and active energy, and writes the dietary energy and macros you log back to Health. You can change each permission any time in the Health app under Sharing > Apps.

Your logs live on your device. You can export your data from within the App. [Confirm in-app export location & format] To remove all data, delete individual entries or remove the App; to clear synced copies, delete the App’s iCloud data in your device settings.

Yes. Editable macro goals, barcode scanning, manual and quick-add logging, daily macro rings, and Apple Health sync are free forever. Only AI photo and voice logging require the optional Macronaut Plus subscription, because AI processing has a real per-use cost.

AI photo and voice logging run on cloud AI infrastructure that costs us money for every request. Gating just those features lets us keep all of the core tracking — including changing your own goals — completely free.

On your device, and (if enabled) synced through your own private iCloud account. We do not keep a server-side copy of your food logs. See our Privacy Policy.

No. Photos and audio are sent to our processing provider only to generate your nutrition estimate and are not used to train AI models. They are never sold.

Yes. We only read the categories you approve (steps, workouts, active energy) and write back the nutrition you log. HealthKit data is never sold and never used for advertising. You control every permission in the Health app.

Nutrition figures — including AI estimates, barcode lookups, and database results — are estimates for informational purposes only and may be inaccurate. They are not medical or nutritional advice. Always review and adjust before relying on them, and consult a professional for medical guidance.

Macronaut is an iPhone app and requires iOS 18 or later.

Barcode and search results come from Open Food Facts (nutrition data © Open Food Facts contributors, licensed under the ODbL) with generic and whole foods from USDA FoodData Central.