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FitBook vs Calorimeter: catalog facts
FitBook	Calorimeter
Free Free and open source under the MIT licence, with no ads.	Free Free and open source under the GPL-3.0-or-later licence.
Android	Android
Barcode scanning and OpenFoodFacts search Macro tracking and weight graphs	Personal food database built from the foods you actually eat Scanning of purchased foods for quick entry
Food data depends on OpenFoodFacts coverage Focused on nutrition rather than workouts	Little documentation beyond the store description Android only
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
Not stated if an account is needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.