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Interval Timer vs GDF HEMA Timer: catalog facts
Interval Timer	GDF HEMA Timer
Free Free and open source under the MIT licence.	Free Free and open source under the GPL-3.0.
Android	Android
Quick setup of active and rest times Minimal, easy interface	Large display that is readable during training Configurable rounds
Basic feature set Android only	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
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.