Bite Diary

Bite Diary is a calorie and nutrition tracker for Android built around one rule: your food data never leaves your phone. There is no account to create, no cloud sync, and no server behind it — everything you log lives in a local database on your device, and uninstalling the app deletes it. The only network calls the app makes are barcode lookups (which send nothing but the barcode number) and loading its single banner ad.

You can log meals three ways: search a built-in library of around 285 whole foods with USDA FoodData Central values, scan a product barcode to pull nutrition from Open Food Facts, or enter foods manually. If a barcode result is missing or wrong, you can correct it inside the app and push the fix back to Open Food Facts so it helps everyone — Bite Diary is a listed reuser of the Open Food Facts database.

Beyond calories it tracks protein, carbs, sugars, fiber, fat, saturated fat, sodium and cholesterol, and you choose which of those appear on your dashboard, each with its own goal. It also handles recipes (build a meal from ingredients and it calculates the nutrition per serving or per 100 g), weight tracking with an optional BMI indicator, and a weekly calorie chart.

Metric and imperial units, dark mode, four themes, and it works offline apart from barcode lookups.

Free with one banner ad on the home screen — no subscription, no paywalled features, no premium tier. Android only, and not open source.