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sleek vs Endeavour: catalog facts
sleek	Endeavour
Free Free and open source.	Free Free and open source under the GPL-3.0 licence.
Windows, macOS, Linux	Linux
Tasks kept in plain todo.txt files you own Runs on Linux, Windows and macOS	Native GNOME design Long-running project
Limited to what the todo.txt format can express	Linux only Aimed at personal task lists rather than team project management
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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