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KontacteM Client
Free

Free and open source, developed by the KDE community.

 Freemium

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

Linux Windows, macOS, Android, iOS
  • Mail, calendar, contacts and feeds in one window
  • Works offline with your data
  • Handles Gmail, Microsoft 365, Outlook, Exchange and plain IMAP without plugins
  • Email, calendar, tasks, contacts, notes and chat in one polished window
  • Best suited to the KDE Plasma desktop
  • Large suite with many settings to learn
  • No Linux version
  • The free licence is capped at two accounts and forbids any commercial use
Downloadable app Downloadable app
Open source Closed source
License not stated License not stated
No account needed Account needed
Works offline Works offline

Checked September 24, 2026

Checked September 20, 2026

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