Compare software

Microsoft OutlookOneCalendar
Freemium

Free app and account available; Microsoft 365 plans add paid features and Office apps.

 Free

Free to download from the app stores.

Windows, macOS, Android, iOS, Web Windows, macOS, Android, iOS
  • Email, calendar and contacts for multiple accounts in one app
  • Available on desktop, mobile and web
  • Supports Google, Outlook, Exchange, iCloud, CalDAV and many other providers
  • Available on Android, iPhone, iPad, Mac and Windows
  • Closed source and tied to Microsoft services
  • Some features, including Copilot, require a paid plan
  • Closed source
  • No Linux version
Downloadable app, Web application 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 Works offline

Checked September 23, 2026

Checked October 2, 2026

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