Compare software

Google Calendar vs Calendars by Readdle: catalog facts
Google Calendar	Calendars by Readdle
Free Free with a Google account.	Free Free to download from the App Store and as a Mac download.
Web	macOS, iOS
Free to use Syncs across devices	Natural language event creation Calendars and tasks in one view
Requires a Google account Data is stored on Google's servers	Apple platforms only No Windows or Android version
Web application, Hosted service	Downloadable app
Closed source	Closed source
License not stated	License not stated
Account needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 1, 2026

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