Compare software

JsonStudioBlack Fennec
Free

The official website describes the app as free.

 Free

Free and open source under the GPL-3.0 license.

Windows, macOS, Linux Linux
  • Edits JSON in synchronized source, tree, and grid views.
  • Compares, converts, and validates JSON data against schemas.
  • Visual editing for JSON and other semi-structured data
  • Uses GTK4 and Libadwaita
  • macOS builds are not Apple Developer ID notarized, so first launch may require manual confirmation.
  • Available for Linux.
Downloadable app Downloadable app
Open source Open source
License: Apache-2.0 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

Checked October 4, 2026

Checked October 8, 2026

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