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Eclipse IDE vs IntelliJ IDEA: catalog facts
Eclipse IDE	IntelliJ IDEA
Free The open-source application is available without a license fee.	Freemium The Community Edition is free. IntelliJ IDEA Ultimate requires a paid subscription.
Windows, macOS, Linux	Windows, macOS, Linux
Huge plugin marketplace covering languages and domains other IDEs ignore Entirely open source and free for commercial use	Refactorings and inspections that understand the whole project, not just the file Community Edition is free and open source
The workspace and perspective model feels dated and confuses newcomers Plugin quality varies widely and conflicts are common	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: EPL-2.0	License: Apache-2.0
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
Official website Full listing and sources Checked September 22, 2026	Official website Full listing and sources Checked September 22, 2026

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