v0.5.0 — Latest Stable Release

Klein.

The modern Terminal Integrated Development Environment (TIDE) built for speed, simplicity, and PowerShell performance.

Written in Rust with Tree-sitter parsing, LSP intelligence, and a rope-based editor core — Klein delivers an instant, keyboard-driven workflow that feels like a modern IDE, right inside your terminal.

↓ Install for Windows ⌥ View on GitHub
Windows Linux macOS
^S Save
^Q Quit
^E Editor
^F Sidebar
^T Terminal
^B Toggle Sidebar
^J Toggle Terminal
^H Help
main.rs
config.json
lib.rs
File Explorer
📁 klein-web
📁 Dist
📁 node_modules
📁 public
📁 src
📄 README.md
📄 LICENSE.md
📄 CONTRIBUTION.md
Klein IDE - main.rs
1
Terminal
Klient@DESKTOP-K34JIF1 MINGW64 ~/Desktop/Project/klein-web (main)
$

Get Started

Install Klein

Run the following command in your terminal. Windows usage via PowerShell is highly recommended.

Primary: Windows (PowerShell)

irm https://klein.adarshas.me/install.ps1 | iex

Secondary: Linux / macOS / WSL (Shell)

curl -sSf https://klein.adarshas.me/install.sh | sh

Via Cargo (crates.io)

cargo install klein-ide

Crate published as klein-ide · binary runs as klein

Via mise (auto-detect OS & arch)

mise use -g github:Adarsh-codesOP/Klein

The Core Philosophy

Minimal Interface.
Maximum Developer Focus.

Klein isn't just an editor; it's a TIDE. We believe in instant startup, keyboard-first navigation, and staying out of your way so you can focus on writing great code.

Benchmarks · cold start

PERFORMANCE

Klein this editor
~70ms
Neovim runner-up
~30–120ms
VS Code runner-up
~2000–4000ms

* Measured on Windows 11, i5-13500HX, 16GB RAM

Klein opened before I finished lifting my finger. It's the first time an editor has actually felt faster than my thoughts.
Senior Engineer, @Mlem verified user
24
GitHub Stars
3
Contributors
1
Fork
v0.5.0
Latest Stable

The mouse is optional.
(We just don't
recommend it.)

Every keystroke is a decision. Klein respects that. Your fingers already know the way.

CTRL+R
Focus Explorer (Sidebar)
CTRL+E
Focus Editor
CTRL+T
Focus Terminal
ESC
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0
⌫
TAB
Q
W
E
R
T
Y
U
I
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P
⏎
CAPS
A
S
D
F
G
H
J
K
L
RETURN
SHIFT
Z
X
C
V
B
N
M
,
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SHIFT
FN
CTRL
ALT
ALT
CTRL
⌕ rg "bootstrap"—typerust
src/main.rs :10 Editor::bootstrap()
src/config.rs :44 fn bootstrap_lsp()
tests/startup.rs :7 // bootstrap_time_ms
Cargo.toml :2 name = "klein-bootstrap"
46,200 files scanned 4 results 0.012s
Powerful IDE Features

Beyond simple text editing.

Klein combines the speed of terminal tools with powerful IDE features — Tree-sitter parsing, LSP intelligence, project-wide search, and modern syntax highlighting in a single terminal window.

Multi-tab Support Fuzzy File Finder Ripgrep Search Tree-Sitter Syntax LSP Integration

Stop waiting.
Start building.

Klein is free, open-source, and ready to rip.

↓ Download for Windows Read the Docs → ⌥ View Source