Compare software

ThunderbirdBusyCal
Free

Free forever, funded by donations.

 Paid

Costs $49.99 USD after a free 14-day trial, and is also included in Setapp.

Windows, macOS, Linux, Android macOS, iOS
  • Unified inbox across every account, or each account kept separate, your choice
  • Mail, calendar, contacts and tasks in one application rather than four
  • Works with iCloud, Google, Exchange and CalDAV
  • Highly customizable views including a Year Planner
  • The interface carries a lot of history and can feel dense next to a webmail tab
  • Major ESR releases have historically been disruptive for add-ons and settings
  • Apple platforms only
  • Paid after the trial
Downloadable app Downloadable app
Open source Closed source
License: MPL-2.0 License not stated
No account needed Not stated if an account is needed
Works offline Not stated if it works offline

Checked September 20, 2026

Checked September 23, 2026

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