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Fast N Fitness vs Flexify: catalog facts
Fast N Fitness	Flexify
Free Free and open source under the BSD-3-Clause licence.	Free Free and open source.
Android	Android
Tracks both cardio and strength training Custom machines and exercises	Works fully offline Progress graphs and rest timers
Android only No releases published on GitHub	No generated training plans or coaching Small project maintained mainly by one developer
Downloadable app	Downloadable app
Open source	Open source
License: BSD-3-Clause	License not stated
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 1, 2026

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