The lightest IDE.

A lightweight macOS code editor with a built-in terminal.

01 — Terminal

Full terminal.
No compromises.

Real PTY terminal emulation. Not a simulated shell. Run any CLI tool — Claude Code, git, npm, docker — exactly as you would in Terminal.app.

claude "optimize this query"

Analyzing database schema...

Found N+1 query in users.ts:42

Replaced with batch query. 12x faster.

 

02 — Speed

Milliseconds.
Not seconds.

Native macOS application. 41ms startup time. 23MB memory footprint. No Electron. No Chrome engine. Just Swift and AppKit.

CotEditor 41ms
VSCode 1.2s
Cursor 1.4s
03 — Split View

Two terminals.
One window.

Run your AI assistant in one pane, your dev server in another. Edit code above, command below. Maximum workflow, minimum chrome.

Terminal 1 — claude

Analyzing src/...

Refactored 3 files

Terminal 2 — dev

VITE ready in 120ms

localhost:5173

04 — AI Native

Every AI.
Zero plugins.

Claude Code, Codex, OpenCode, Aider — if it runs in a terminal, it runs here. No marketplace. No extensions. Just open a terminal and go.

Claude Code
Codex
OpenCode
Aider
Copilot CLI
Any CLI tool
"VSCode felt heavy.
Cursor added too much magic.
I just needed simplicity."

Start coding.