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Clock vs Retro: catalog facts
Clock	Retro
Free Free and open source under the GPL-2.0 or later licence.	Free Free and open source under the GPL-3.0 licence.
Linux	Linux
Alarms, timers, stopwatch and world clock in one app Alarms can wake the device from suspend on Plasma	Customizable segment display appearance Can run always on top as a widget
Wake-from-suspend works only on Plasma Linux only	Only shows a clock, with no alarms or timers mentioned Small project with infrequent development
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-or-later	License: GPL-3.0
No account needed	No account 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.