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IntelliJ IDEATheia IDE
Freemium

The Community Edition is free. IntelliJ IDEA Ultimate requires a paid subscription.

 Free

Free and open source.

Windows, macOS, Linux Windows, macOS, Linux, Web
  • Refactorings and inspections that understand the whole project, not just the file
  • Community Edition is free and open source
  • Runs VS Code extensions from Open VSX
  • Available on desktop and online
  • Framework support, profiler and database tools are Ultimate features
  • Indexing a large project is slow and memory-hungry
  • Uses Open VSX rather than the Microsoft extension marketplace
  • Smaller user community than VS Code
Downloadable app Downloadable app, Web application
Open source Open source
License: Apache-2.0 License not stated
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

Checked September 22, 2026

Checked September 23, 2026

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