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Biblioteca vs Zeal: catalog facts
Biblioteca	Zeal
	Screenshots
Best for: Developers writing GNOME and GTK apps who want offline docs	Best for: Search downloaded programming documentation without going online
Free Free and open source under the GPL-3.0 licence.	Free The open-source application is available without a license fee.
Linux	Windows, Linux
Reads GNOME documentation without an internet connection Native GNOME interface All 3 strengths for Biblioteca Reads GNOME documentation without an internet connection Native GNOME interface Available on Flathub	Searchable offline documentation collections
Limited to GNOME documentation Small project with infrequent updates	Docsets must be downloaded before offline use.
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0
No account needed	Not stated if an account is needed
Offline features available	Not stated if it works offline
Official website Full listing and sources Sources for Biblioteca biblioteca.sonny.re Catalog checked October 1, 2026	Official website Full listing and sources Sources for Zeal github.com/zealdocs/zeal Catalog checked September 22, 2026

“Not stated” means we have not confirmed it. Features can vary by device and plan.

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