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

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

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