OpenIDEA: The IDE you know, rebuilt in Rust OpenIDEA, an open-source IDE built on a Rust core with the Tauri framework, launched under the Apache 2.0 license as a native rebuild of the IntelliJ IDEA workflow, covering editor, code insight, debugger, Git, terminal, database and HTTP clients across 60+ languages for macOS, Windows and Linux. In a benchmark on the ~770-file Python project freqtrade with warm caches (median of 5 runs on Windows 11, 32-core AMD, 62 GB RAM), OpenIDEA opened a project window in 0.9 s versus 3.1 s for IntelliJ IDEA 2026.2.3, reached ready state in 1.1 s versus 13.2 s, used 169 MB of memory versus 2011 MB, consumed 2.4 s of CPU time until ready versus 47.9 s, and quit in 0.3 s versus 5.9 s. The project states it is not affiliated with JetBrains, which owns the IntelliJ IDEA trademark, and notes IDEA analyzes Python more deeply, so "ready" does not represent identical work on both sides. The IDE you know, rebuilt in Rust. Download https://github.com/l0ng-ai/openidea/releases/latest · Benchmark benchmark · Build build · Discord https://discord.gg/2Zy4yn7gP openidea-promo.mp4 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. Opening freqtrade https://github.com/freqtrade/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 https://github.com/l0ng-ai/openidea/blob/main/perf/compare to run it on your machine and projects. pnpm install pnpm tauri dev Rust 1.96, Node 22, pnpm and the Tauri prerequisites https://v2.tauri.app/start/prerequisites/ . Native notebook execution tests are opt-in and need two distinct Python environments with ipykernel installed: OPENIDEA TEST PYTHON=/first/env/bin/python \ OPENIDEA TEST PYTHON SECOND=/second/env/bin/python \ cargo test -p ide-notebook --test kernel runtime -- --ignored --test-threads=1 Apache 2.0 https://github.com/l0ng-ai/openidea/blob/main/LICENSE . Bundled third-party assets are listed in THIRD PARTY LICENSES.md https://github.com/l0ng-ai/openidea/blob/main/THIRD PARTY LICENSES.md .