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GDF HEMA Timer vs TimeR Machine: catalog facts
GDF HEMA Timer	TimeR Machine
Free Free and open source under the GPL-3.0.	Free Free and open source under the GPL-3.0 licence.
Android	Android
Large display that is readable during training Configurable rounds	Multi-stage timer plans Useful for workouts and non-workout tasks
Small project with a single developer No formal releases on GitHub; installed through F-Droid	Android only Many options can take time to learn
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	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.