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Calendars by Readdle vs Notion Calendar: catalog facts
Calendars by Readdle	Notion Calendar
Free Free to download from the App Store and as a Mac download.	Free Free to use.
macOS, iOS	Windows, macOS, Android, iOS
Natural language event creation Calendars and tasks in one view	Free Tight integration with Notion databases and docs
Apple platforms only No Windows or Android version	Built around Google Calendar and Notion Proprietary
Downloadable app	Downloadable app
Closed source	Closed source
License not stated	License not stated
Not stated if an account is 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 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.