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sleek vs Getting Things GNOME!: catalog facts
sleek	Getting Things GNOME!
Free Free and open source.	Free Free and open source under the GPL-3.0.
Windows, macOS, Linux	Linux
Tasks kept in plain todo.txt files you own Runs on Linux, Windows and macOS	Native GNOME desktop application Open source under the GPL-3.0
Limited to what the todo.txt format can express	Linux only Little current documentation in one place since the GNOME wiki was retired
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: GPL-3.0
Not stated if an account is needed	Not stated if an account is 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.