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Privacy Friendly Circuit Trainer vs SimpleHIIT: catalog facts
Privacy Friendly Circuit Trainer	SimpleHIIT
Free Free and open source under the GPL-3.0 with no ads.	Free Free and open source under the GPL-3.0-or-later licence.
Android	Android
Configurable exercise and rest timers Custom exercises combined into sets	Animated demonstrations for each exercise Eight exercise categories to choose from
Android only Calorie figures are estimates based on MET values	Android only Focused on HIIT rather than general workout logging
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
Not stated if an account is 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.