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Black Fennec vs Dadroit JSON Viewer: catalog facts
Black Fennec	Dadroit JSON Viewer
Free Free and open source under the GPL-3.0 license.	Freemium Proprietary software; see the developer's site for current editions and licence terms.
Linux	Windows
Visual editing for JSON and other semi-structured data Uses GTK4 and Libadwaita	Dedicated application for viewing JSON data files Installable on Windows through Scoop
Available for Linux.	Proprietary, closed source Limited public detail on features and pricing in the available information
Downloadable app	Downloadable app
Open source	Closed source
License: GPL-3.0	License: Proprietary
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked October 2, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.