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Notion Calendar vs Calendars by Readdle: catalog facts
Notion Calendar	Calendars by Readdle
Free Free to use.	Free Free to download from the App Store and as a Mac download.
Windows, macOS, Android, iOS	macOS, iOS
Free Tight integration with Notion databases and docs	Natural language event creation Calendars and tasks in one view
Built around Google Calendar and Notion Proprietary	Apple platforms only No Windows or Android version
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 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.