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Fast N Fitness vs Spix: catalog facts
Fast N Fitness	Spix
Free Free and open source under the BSD-3-Clause licence.	Free Free and open source under the AGPL-3.0, with no subscription.
Android	Android
Tracks both cardio and strength training Custom machines and exercises	Automatic rep counting with the camera GPS run tracking with maps
Android only No releases published on GitHub	Android only Small project by a single developer with no dedicated product page
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License: AGPL-3.0
Not stated if an account is needed	No account needed
Not stated if it works offline	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.