Reason Editor
A fast, modern editor for Reason—clean syntax, smart tooling, and focused coding.
Try Reason in ZedPowered by Tree-sitter
Precise Syntax Highlighting
Variants, JSX‑style syntax, and type annotations in Reason are highlighted as quickly as you write.
Semantic Understanding
Tree-sitter parses your code into a syntax tree, enabling features like code folding, selection expansion, and precise highlighting.
Instant Updates
Syntax highlighting updates in real-time as you type, with no lag or delay even in large files.
Error Recovery
Even with syntax errors, Tree-sitter maintains accurate highlighting for the rest of your code.
Popular Extensions
Enhance Zed with popular extensions from our growing ecosystem.
Browse all extensionsDebugging Support
Reason Debugging
While native Reason debugging isn't available yet, Zed offers powerful debugging capabilities for other languages with full DAP support.
Learn about Zed's Debugger
Debug Adapter Protocol
Zed supports the Debug Adapter Protocol (DAP) for standardized debugging across multiple languages.
Universal Debugging Features
Breakpoints, variable inspection, call stack navigation, and step-through debugging when supported.
Debug Adapter Protocol
Zed supports the Debug Adapter Protocol (DAP) for standardized debugging across multiple languages.
Universal Debugging Features
Breakpoints, variable inspection, call stack navigation, and step-through debugging when supported.
Why Zed
Built for Modern Reason Development
Experience features that make Reason development faster and more enjoyable.
Download ZedFast
Open large Reason projects instantly. Navigate & edit with zero lag, even in massive codebases.
Agentic
Generate Reason code, write tests, and refactor with integrated AI that understands your context.
Collaborative
Pair program, debug together, and share your Reason projects with your team in real-time.
Explore Other Languages
Zed supports more than 80 programming languages out of the box.
View all supported languages