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OpenNutriTracker vs Carb Manager: catalog facts
OpenNutriTracker	Carb Manager
Free Free and open source.	Freemium Free account available, with paid features on top.
Android, iOS	Android, iOS, Web
Open source calorie tracking Privacy-focused design	Focused on keto and low-carb tracking Over 50,000 low-carb recipes
Fewer features than large commercial food trackers Smaller food database than commercial services	Less suited to diets that are not low-carb Closed-source service
Downloadable app	Downloadable app, Web application
Open source	Closed source
License not stated	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 23, 2026

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