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SimpleHIIT vs Tabata Xtreme: catalog facts
SimpleHIIT	Tabata Xtreme
Free Free and open source under the GPL-3.0-or-later licence.	Free This open-source edition is free and ad-free under the MIT licence.
Android	Android
Animated demonstrations for each exercise Eight exercise categories to choose from	Every interval length is configurable Saved presets for repeat workouts
Android only Focused on HIIT rather than general workout logging	Small project with few contributors Only for timing; no workout logging
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Not stated if it 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.