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OneCalendareM Client
Free

Free to download from the app stores.

 Freemium

Free licence for personal, non-commercial use with up to two accounts; Personal from…

Windows, macOS, Android, iOS Windows, macOS, Android, iOS
  • Supports Google, Outlook, Exchange, iCloud, CalDAV and many other providers
  • Available on Android, iPhone, iPad, Mac and Windows
  • Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins
  • Email, calendar, tasks, contacts, notes and chat in one polished window
  • Closed source
  • No Linux version
  • No Linux version
  • The free licence is capped at two accounts and forbids any commercial use
Downloadable app Downloadable app
Closed source Closed source
License not stated License not stated
Not stated if an account is needed Account needed
Works offline Works offline

Checked October 2, 2026

Checked September 20, 2026

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