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Zham vs The Clock: catalog facts
Zham	The Clock
Free Free and open source under GPL-3.0-or-later.	Paid Free download available, with a purchase required for the full app.
Android	macOS
Converts times across cities and dates Includes a resizable home-screen widget	Meeting planner slider that handles daylight saving Business hours and holiday tracking for contacts
Android only	macOS only Proprietary and paid
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0-or-later	License not stated
No account needed	Not stated if an account is needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

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