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Clocker vs Zham: catalog facts
Clocker	Zham
Free Available from the Mac App Store.	Free Free and open source under GPL-3.0-or-later.
macOS	Android
Unlimited time zone clocks with custom labels Time scrubber for planning meetings across zones	Converts times across cities and dates Includes a resizable home-screen widget
macOS only Calendar features depend on Apple Calendar	Android only
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-3.0-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 8, 2026

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