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Zham vs Clocker: catalog facts
Zham	Clocker
Free Free and open source under GPL-3.0-or-later.	Free Available from the Mac App Store.
Android	macOS
Converts times across cities and dates Includes a resizable home-screen widget	Unlimited time zone clocks with custom labels Time scrubber for planning meetings across zones
Android only	macOS only Calendar features depend on Apple Calendar
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 1, 2026

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