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Tabata Xtreme vs GDF HEMA Timer: catalog facts
Tabata Xtreme	GDF HEMA Timer
Free This open-source edition is free and ad-free under the MIT licence.	Free Free and open source under the GPL-3.0.
Android	Android
Every interval length is configurable Saved presets for repeat workouts	Large display that is readable during training Configurable rounds
Small project with few contributors Only for timing; no workout logging	Small project with a single developer No formal releases on GitHub; installed through F-Droid
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0
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.