egui
Pure Rust immediate-mode GUI library targeting desktop (via eframe/winit) and web (via WebAssembly). Implements an immediate-mode UI pattern where the entire UI is redrawn every frame — simple to use, no complex widget state management. Used for developer tools, debuggers, game editors, data visualization tools, and agent-facing control panels. Works identically on Linux, Windows, macOS, and browsers via WASM.
Score Breakdown
⚙ Agent Friendliness
🔒 Security
GUI rendering library — no external data transmission. Rust memory safety applies. WASM sandbox for browser targets.
⚡ Reliability
Best When
You're building a developer tool, game editor, or visualization app in Rust that needs a simple, cross-platform GUI without learning a separate UI framework.
Avoid When
You need web SEO, native OS widget look-and-feel, complex document layouts, or accessibility compliance — egui is not appropriate for public-facing web apps.
Use Cases
- • Build cross-platform desktop developer tools and debuggers in Rust with a simple immediate-mode UI model
- • Create Rust WASM web applications with native-like UI performance without JavaScript UI frameworks
- • Develop agent monitoring dashboards and control panels in Rust that compile to both desktop and web targets
- • Build game editors, data visualization tools, and configuration UIs for Rust applications without UI framework overhead
- • Prototype UI layouts quickly with egui's immediate-mode model — no widget state management or event propagation
Not For
- • Production web apps requiring SEO, accessibility compliance, or standard HTML/CSS layout — use React/Vue for web
- • Complex document-style layouts — egui's immediate mode handles tooling UIs well but not document layouts
- • Teams expecting native OS widgets — egui renders its own custom widgets, not native OS controls
Interface
Authentication
GUI rendering library. No authentication required.
Pricing
MIT license. Created and maintained by Emil Ernerfeldt.
Agent Metadata
Known Gotchas
- ⚠ Immediate-mode means all UI code runs every frame — expensive computations in UI callbacks cause frame rate drops; cache heavy results outside the UI closure
- ⚠ Widget IDs must be unique within a frame — using duplicate IDs for multiple widgets of the same type causes state collision; use id_source() to disambiguate
- ⚠ Text rendering uses egui's built-in font system — custom fonts require loading font data at startup, not at render time
- ⚠ WASM bundle size can be large (2-5MB) — use trunk or wasm-pack with wasm-opt optimization flags for web deployment
- ⚠ Accessibility (ARIA, screen reader) support is limited in egui — not suitable for apps with accessibility requirements
- ⚠ eframe (the app framework wrapper) handles platform-specific windowing — using egui without eframe requires manual integration with winit and wgpu/glow
Alternatives
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Scores are editorial opinions as of 2026-03-07.