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Tabata Xtreme vs Privacy Friendly Circuit Trainer: catalog facts
Tabata Xtreme	Privacy Friendly Circuit Trainer
Free This open-source edition is free and ad-free under the MIT licence.	Free Free and open source under the GPL-3.0 with no ads.
Android	Android
Every interval length is configurable Saved presets for repeat workouts	Configurable exercise and rest timers Custom exercises combined into sets
Small project with few contributors Only for timing; no workout logging	Android only Calorie figures are estimates based on MET values
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.