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Flexify vs Fast N Fitness: catalog facts
Flexify	Fast N Fitness
Free Free and open source.	Free Free and open source under the BSD-3-Clause licence.
Android	Android
Works fully offline Progress graphs and rest timers	Tracks both cardio and strength training Custom machines and exercises
No generated training plans or coaching Small project maintained mainly by one developer	Android only No releases published on GitHub
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: BSD-3-Clause
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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