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sleek vs Reinschrift: catalog facts
sleek	Reinschrift
Free Free and open source.	Free Free and open source under the GPL-3.0-or-later.
Windows, macOS, Linux	Linux, Web, Self-hosted, Command line
Tasks kept in plain todo.txt files you own Runs on Linux, Windows and macOS	Tasks live in a plain Markdown file with no database Desktop app, shell extension, CLI and web app share one file
Limited to what the todo.txt format can express	Desktop app is built for GNOME No native mobile apps mentioned
Downloadable app	Downloadable app, Self-hosted
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	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.