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Microsoft To Do vs Ao: catalog facts
Microsoft To Do	Ao
Free Free to use from Microsoft.	Free Free and open source under the MIT license.
Windows, macOS, Android, iOS, Web	Windows, macOS, Linux
Free with no paid tier needed for the app itself Works with Outlook tasks and Microsoft Planner	Customizable local and global keyboard shortcuts Dark, black, and sepia themes
Closed source and tied to Microsoft's services Most useful for people already in the Microsoft 365 ecosystem	Requires a Microsoft To Do account
Downloadable app, Web application	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked October 8, 2026

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