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Calendars by Readdle vs Google Calendar: catalog facts
Calendars by Readdle	Google Calendar
Free Free to download from the App Store and as a Mac download.	Free Free with a Google account.
macOS, iOS	Web
Natural language event creation Calendars and tasks in one view	Free to use Syncs across devices
Apple platforms only No Windows or Android version	Requires a Google account Data is stored on Google's servers
Downloadable app	Web application, Hosted service
Closed source	Closed source
License not stated	License not stated
Not stated if an account is needed	Account needed
Not stated if it 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 23, 2026

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