Released 1.x types never change, so the sets and records that will have to grow are opened up before the API is frozen: - Event kinds and action sources are strings; `event`, view `body`, `view-event` and `field-value` get an `other(extension)` case (a kind and JSON data) that carries later cases to older plugins and IDEs. An IDE refuses an event kind it doesn't know, says a view body needs a newer IDE, and leaves out unknown form fields. - Completion items can be snippets, match on `filter-text` and bring `additional-edits` (imports). Code actions can carry `data` instead of edits; the new `resolve-code-action` export computes them when the user picks the action, under the command budget, through the existing resolve path. - Diagnostics name their `source`, carry `tags` (`unnecessary`, `deprecated`) and `related` locations. - The SDK's enums are `#[non_exhaustive]` with `Other` variants; `Diagnostic::new`, `Providers::resolve_code_action`. - README: 1.x calls stay synchronous and pass documents whole; async and incremental sync come later behind the host adapter or a new interface. Official plugins and fixtures rebuilt.
The IDE you know, rebuilt in Rust.
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https://github.com/user-attachments/assets/234dd54c-1255-4b3a-b35c-533d78d737c0
OpenIDEA brings the IntelliJ IDEA way of working — its keymap, its tool windows, its search-everything habits — to a native app with a Rust core.
Editor, code insight, debugger, Git, terminal, database and HTTP clients, for 60+ languages. Builds for macOS, Windows and Linux.
Benchmark
Opening freqtrade (Python, ~770 files) with warm caches, median of 5 runs:
| OpenIDEA | IntelliJ IDEA 2026.2.3 | |
|---|---|---|
| Window with the project | 0.9 s | 3.1 s |
| Ready (CPU settled) | 1.1 s | 13.2 s |
| Memory (USS, all processes) | 169 MB | 2011 MB |
| CPU time until ready | 2.4 s | 47.9 s |
| Idle CPU | 4 % of a core | 7 % of a core |
| Quit | 0.3 s | 5.9 s |
A release build of OpenIDEA from main and IDEA with default settings and plugins, on
Windows 11, 32-core AMD, 62 GB RAM.
IDEA analyses Python more deeply, so "ready" doesn't mean the same work on
both sides. Both are measured from the outside, the same way: see
perf/compare to run it on your machine and projects.
License
Apache 2.0. Bundled third-party assets are listed in THIRD_PARTY_LICENSES.md.
Not affiliated with JetBrains. IntelliJ IDEA is a trademark of JetBrains s.r.o.