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topydo vs TTDL: catalog facts
topydo	TTDL
Free Free and open source under the GPL-3.0 licence.	Free Free and open source under the MIT licence.
Command line	Windows, Command line
Plain todo.txt file readable by other tools Due dates, dependencies and recurring tasks	Uses the plain text todo.txt format, readable in any editor Works entirely in the terminal
Terminal only, no graphical or mobile app Extended tags may not be understood by other todo.txt tools	Command-line only, with no graphical interface No built-in sync; syncing the file is up to you
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	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.