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Swifty Notes vs Bookup: catalog facts
Swifty Notes	Bookup
Free Free and open source under the MIT license.	Free Free and open source under the GPL-3.0-or-later licence.
macOS, Linux	Linux
Native GTK and Adwaita interface Markdown editing with preview	Notes written in Markdown Native GTK 4 interface for GNOME
Small project with a limited user base Sync options are not described in the research	Linux only Small single-developer project with limited documentation
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: GPL-3.0-or-later
Not stated if an account is needed	No account needed
Not stated if it 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.