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GDF HEMA Timer vs Interval Timer: catalog facts
GDF HEMA Timer	Interval Timer
Free Free and open source under the GPL-3.0.	Free Free and open source under the MIT licence.
Android	Android
Large display that is readable during training Configurable rounds	Quick setup of active and rest times Minimal, easy interface
Small project with a single developer No formal releases on GitHub; installed through F-Droid	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.