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