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Greenfoot vs BlueJ: catalog facts
Greenfoot	BlueJ
Free Free to download.	Free Free and open source under the GPL-2.0 with the Classpath Exception.
Windows, macOS, Linux	Windows, macOS, Linux
Visual feedback while writing real Java code Official textbook and teacher community	Designed for beginners learning Java Native installers for Windows, macOS and Linux, including ARM64
Focused on education rather than general development Java only	Java only Requires a 64-bit operating system; 32-bit users need the old 4.1.4 release
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: GPL-2.0-only WITH Classpath-exception-2.0
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked October 1, 2026

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