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Privacy Friendly Circuit Trainer vs Exercise Timer: catalog facts
Privacy Friendly Circuit Trainer	Exercise Timer
Free Free and open source under the GPL-3.0 with no ads.	Free Free and open source under the GPLv3.
Android	Linux
Configurable exercise and rest timers Custom exercises combined into sets	Saved presets for sets and interval lengths Audible cues before and at each transition
Android only Calorie figures are estimates based on MET values	Timer only, with no workout logging or history Linux desktop only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
Not stated if an account is needed	No account 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 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.