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Java Geometry Expert vs Kig: catalog facts
Java Geometry Expert	Kig
Free The Flathub listing identifies it as GPL-3.0-or-later.	Free Free and open source as part of the KDE applications.
Linux	macOS, Linux
Combines interactive geometry with automated proving Diagrams can be changed dynamically	Constructions update live as you drag elements Extensible with macros and Python scripting
Linux package evidence is provided	No Windows or mobile version listed Narrower in scope than GeoGebra
Downloadable app	Downloadable app
Open source	Open source
License: GPL-3.0-or-later	License: GPL-2.0-or-later
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 8, 2026	Official website Full listing and sources Checked September 24, 2026

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