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Clocker vs Itsycal: catalog facts
Clocker	Itsycal
Free Available from the Mac App Store.	Free Free download from the developer's website.
macOS	macOS
Unlimited time zone clocks with custom labels Time scrubber for planning meetings across zones	Uses the events already in the Mac Calendar app Extensive keyboard controls, including Vim motions
macOS only Calendar features depend on Apple Calendar	macOS only, version 11 or later Depends on Calendar app accounts for event sync
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 24, 2026

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