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Clocks vs Timer: catalog facts
Clocks	Timer
Free Free and open source under the GPL-2.0-or-later licence.	Free Free and open source under the GPL-3.0-or-later licence.
Linux	Linux
World clocks, alarms, stopwatch and timers in one app Regular releases from the GNOME project	Can shut down, reboot or suspend when the countdown ends Custom notification text or alarm sound
Linux only and designed around GNOME Covers basic time-keeping only	In maintenance mode with no new features planned Linux only
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-3.0-or-later
No account needed	Not stated if an account is needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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