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Privacy Friendly Circuit Trainer vs Interval Timer: catalog facts
Privacy Friendly Circuit Trainer	Interval Timer
Free Free and open source under the GPL-3.0 with no ads.	Free Free and open source under the MIT licence.
Android	Android
Configurable exercise and rest timers Custom exercises combined into sets	Quick setup of active and rest times Minimal, easy interface
Android only Calorie figures are estimates based on MET values	Basic feature set Android only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: MIT
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.