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ReminduckMicrosoft To Do
Free

Free and open source under the GPL-3.0-or-later licence.

 Free

Free to use from Microsoft.

Linux Windows, macOS, Android, iOS, Web
  • Simple, single-purpose reminder app
  • Playful design with a quacking duck
  • Free with no paid tier needed for the app itself
  • Works with Outlook tasks and Microsoft Planner
  • Linux only
  • Basic feature set compared with full task managers
  • Closed source and tied to Microsoft's services
  • Most useful for people already in the Microsoft 365 ecosystem
Downloadable app Downloadable app, Web application
Open source Closed source
License: GPL-3.0-or-later License not stated
No account needed Not stated if an account is needed
Not stated if it works offline Not stated if it works offline

Checked October 1, 2026

Checked September 23, 2026

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