Calling it "OpenIDEA" is a bit misleading. IntellijIDEA is free and open source (Apache 2.0) since 2009. Paid subscription basically gives you extra plugins. And as others pointed out, saying that it was rebuilt in Rust is at least as much misleading: the code processing is still standalone LSP processes, frontend is WebView with typescript, only Tauri glue code is Rust. And that in turn makes me extremely skeptical about claimed memory usage! Consider that you must compare idea.exe against combo of WebView (on windows: chromium edge) + LSP (for Java, likely Eclipse LSP, at least that's what VSCode traditionally uses for Java). Is it realistic to fit that in claimed 169 MB?