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Zeal vs Manuals: catalog facts
Zeal	Manuals
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Best for: Search downloaded programming documentation without going online	Best for: GNOME and GTK developers reading API documentation offline
Free The open-source application is available without a license fee.	Free Free and open source under the GPL-3.0-or-later licence.
Windows, Linux	Linux
Searchable offline documentation collections	Indexes local devhelp documentation Browse documentation by SDK All 3 strengths for Manuals Indexes local devhelp documentation Browse documentation by SDK Fast free-form search
Docsets must be downloaded before offline use.	Linux only Mainly useful for GTK and GNOME development
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0	License: GPL-3.0-or-later
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 Manuals apps.gnome.org/Manuals Catalog checked October 1, 2026

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

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