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todo.txt vs topydo: catalog facts
todo.txt	topydo
Free Free and open source.	Free Free and open source under the GPL-3.0 licence.
macOS, Linux, Command line	Command line
Tasks stored in a plain text file you own Simple format readable in any editor	Plain todo.txt file readable by other tools Due dates, dependencies and recurring tasks
Terminal only, no graphical interface No built-in reminders or recurring tasks	Terminal only, no graphical or mobile app Extended tags may not be understood by other todo.txt tools
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
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.