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