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Bookup vs Folio: catalog facts
Bookup	Folio
Free Free and open source under the GPL-3.0-or-later licence.	Free Free and open source under the GPL-3.0.
Linux	Linux
Notes written in Markdown Native GTK 4 interface for GNOME	Almost WYSIWYG Markdown editing Native GNOME design
Linux only Small single-developer project with limited documentation	Linux only, designed for GNOME No built-in sync described
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.