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Strong vs Flexify: catalog facts
Strong	Flexify
Freemium Free accounts, with a paid Strong PRO tier for progress tracking.	Free Free and open source.
Android, iOS	Android
Simple, fast logging of sets and workouts Available on iOS and Android	Works fully offline Progress graphs and rest timers
Detailed progress charts require Strong PRO Closed source	No generated training plans or coaching Small project maintained mainly by one developer
Downloadable app	Downloadable app
Closed source	Open source
License not stated	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 September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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