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Scratchmark vs Bookup: catalog facts
Scratchmark	Bookup
Free Free and open source under the GPL-3.0.	Free Free and open source under the GPL-3.0-or-later licence.
Linux	Linux
Distraction-free Markdown writing Plain Markdown files organised in folders	Notes written in Markdown Native GTK 4 interface for GNOME
Linux only Small project with a single main developer	Linux only Small single-developer project with limited documentation
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-3.0-or-later
No account 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.