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BlueJ vs IntelliJ IDEA: catalog facts
BlueJ	IntelliJ IDEA
Free Free and open source under the GPL-2.0 with the Classpath Exception.	Freemium The Community Edition is free. IntelliJ IDEA Ultimate requires a paid subscription.
Windows, macOS, Linux	Windows, macOS, Linux
Designed for beginners learning Java Native installers for Windows, macOS and Linux, including ARM64	Refactorings and inspections that understand the whole project, not just the file Community Edition is free and open source
Java only Requires a 64-bit operating system; 32-bit users need the old 4.1.4 release	Framework support, profiler and database tools are Ultimate features Indexing a large project is slow and memory-hungry
Downloadable app	Downloadable app
Open source	Open source
License: GPL-2.0-only WITH Classpath-exception-2.0	License: Apache-2.0
No account 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 1, 2026	Official website Full listing and sources Checked September 22, 2026

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