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Dadroit JSON Viewer vs Black Fennec: catalog facts
Dadroit JSON Viewer	Black Fennec
Freemium Proprietary software; see the developer's site for current editions and licence terms.	Free Free and open source under the GPL-3.0 license.
Windows	Linux
Dedicated application for viewing JSON data files Installable on Windows through Scoop	Visual editing for JSON and other semi-structured data Uses GTK4 and Libadwaita
Proprietary, closed source Limited public detail on features and pricing in the available information	Available for Linux.
Downloadable app	Downloadable app
Closed source	Open source
License: Proprietary	License: GPL-3.0
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 2, 2026	Official website Full listing and sources Checked October 8, 2026

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