A cross-platform API client
in ~10 MB
One installer, ready to run. Requests, mock server, automated testing and load testing built in β no bundled browser engine, no Node sandbox, no JRE.
One installer, ready to run. Requests, mock server, automated testing and load testing built in β no bundled browser engine, no Node sandbox, no JRE.
20β40Γ lighter than Electron-based tools for the same workload.
Rust LTO + a single-process model + zero-copy SQLite storage.
8 HTTP methods, 6 body types; paste-to-import cURL; {{name}} variables resolved everywhere; per-tab drafts.
API Key / Basic / Bearer / OAuth2; environment variable values encrypted with AES-256-GCM.
Local axum mock with port auto-probing, fully offline; rules first, template variables for dynamic responses.
JSON test scripts: variable injection, extraction, assertions; load tests chart QPS and P50/P90/P99.
OpenAPI 3.x / Swagger 2.0 / Postman v2.1 interop; Markdown docs; client code in cURL / JavaScript / Java / Go / Rust / Python / PHP with syntax highlighting.
Built-in MCP server and local HTTP control plane: save a cURL or a Java method as an endpoint with one sentence.
Numbers from official installers and local measurements β verify yourself.
| Dimension | RustFox | Postman | Bruno | Insomnia |
|---|---|---|---|---|
| Installer size | ~10 MB (system WebView) | ~310 MB (Electron) | ~433 MB (Electron) | ~200 MB (Electron) |
| Cold start | < 1 s | 2β4 s | 2β5 s | 2β4 s |
| Runtime memory | ~40 MB | 500 MB+ | 300 MB+ | 200 MB+ |
| App shell | System WebView | Chromium + Node.js | Chromium + Node.js | Chromium + Node.js |
Dark / light / follow-system themes.
Grab the latest build from GitHub Releases; in-app updates supported.
macOS says "damaged"? Run xattr -cr /Applications/RustFox.app then right-click β Open. See the user guide.
Bilingual docs, versioned with the repository.