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

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