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sleek vs TTDL: catalog facts
sleek	TTDL
Free Free and open source.	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Windows, Command line
Tasks kept in plain todo.txt files you own Runs on Linux, Windows and macOS	Uses the plain text todo.txt format, readable in any editor Works entirely in the terminal
Limited to what the todo.txt format can express	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 not stated	License: MIT
Not stated if an account is needed	No account needed
Works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 2, 2026

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