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