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Todoist vs Ao: catalog facts
Todoist	Ao
Freemium Free plan, with a paid Pro upgrade.	Free Free and open source under the MIT license.
Web, Browser extension	Windows, macOS, Linux
Natural-language task entry Custom filters and labels	Customizable local and global keyboard shortcuts Dark, black, and sepia themes
Advanced features require Pro Requires an account	Requires a Microsoft To Do account
Downloadable app, Web application, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: MIT
Account 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.