A comprehensive look at what makes Klein the lightweight power-tool of choice for terminal-first developers.
Written in Rust. Instant bootstrap in <60ms. Minimal memory footprint even with large buffers.
Full structural parsing for 12+ languages including Rust, Python, JavaScript/TypeScript, C/C++, Go, Java, JSON, TOML, HTML/CSS, YAML, and Markdown.
Actor-based Language Server Protocol integration with auto-completion, diagnostics in the gutter & status bar, hover docs, rename, and WorkspaceEdit support.
A modern editor engine built on a rope data structure with full undo/redo, structural editing via Tree-sitter, and efficient range replacement.
Fuzzy file finder and project grep with an interactive picker UI and live preview. Find anything across your codebase instantly.
Seamlessly manage multiple files with an intuitive tab-based interface designed for quick navigation.
Fully integrated shell. Run your build tools, Git commands, and scripts without leaving the editor.
Visual directory tree for effortless project navigation. Collapsible sidebar keeps you focused.
Beautiful, language-aware coloring powered by Tree-sitter. Accurate, structured highlighting for all major languages.
Built for the home row. Every action is a keystroke away. No mouse required (but supported).
A central hub for commands. Quickly execute actions, switch files, or change settings with a simple keyboard shortcut.
Built-in Git operations including status, diff viewing, staging, and commit — all without leaving the editor.
An extensible architecture that allows developers to build and share custom extensions for Klein.
Real-time collaborative editing with presence indicators, shared cursors, and conflict-free merging for pair programming in the terminal.
DAP (Debug Adapter Protocol) support for interactive debugging with breakpoints, variable inspection, and step-through execution.