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Todosian vs ntodotxt: catalog facts
Todosian	ntodotxt
Free Free and open source under the Apache-2.0 licence.	Free Free and open source under the MIT licence.
Android	Android
Works directly on existing Markdown files No account or database import	Uses the open todo.txt plain-text format Works locally without any account
No built-in sync, so a separate sync tool is needed Android only	Android is the only listed platform No hosted sync service of its own
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License: MIT
No account needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked October 2, 2026

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