Can I migrate from WezTerm to arb?

Yes. arb is built on top of WezTerm's core and uses the same Lua configuration format. Most WezTerm configs work with arb with minimal changes. arb adds built-in shell tools, a smaller binary (~40 MB vs ~67 MB), and opinionated defaults.

Open Source · MIT License

Terminal built
for AI coding

Name: arb
Author: szj2ys

The only terminal where Claude Code, Starship, Delta, and syntax highlighting work out of the box. No config files. No plugin managers. Just open and build.

40MB Binary size

100ms Shell boot

6 Built-in tools

0 Config required

$ brew tap szj2ys/arb && brew install arb

Try in 10 seconds — Apple-notarized, no security warnings

Download DMG View on GitHub Star on GitHub

arb

~/projects/webapp on main

➤ claude "add dark mode toggle to the header"

Claude I'll add a dark mode toggle to the header component.

Edited src/components/Header.tsx (+24 lines)

✓ Changes applied successfully

➤ git diff

--- a/src/components/Header.tsx

+++ b/src/components/Header.tsx

@@ -12,6 +12,8 @@

+ <button onClick={toggleDark}>

+ {isDark ? '☼' : '☾'}

~/projects/webapp on main *

➤

Scroll

Features

Everything you need.
Nothing you don't.

arb ships with a carefully curated set of tools so you can start working the moment you open it. No plugins to install. No config files to write.

Zero Config

Polished defaults with JetBrains Mono, Arb Dark theme, optimized macOS font rendering, and smooth animations. Open it and start working.

Built-in Shell Suite

Comes pre-loaded with Starship prompt, z smart directories, Delta for diffs, syntax highlighting, autosuggestions, and completions.

GPU Accelerated

40% smaller binary, instant startup, lazy loading, and a stripped-down GPU-accelerated rendering core. Fast and lightweight.

Lua Scripting

Full Lua scripting support for infinite customization. Configure every detail at ~/.config/arb/arb.lua

Preview

See it in action

Native Split Panes

Work on multiple tasks simultaneously. Drag to resize, keyboard shortcuts to navigate. No tmux required.

Split Horizontally

Cmd+Shift+Enter

Split Vertically

Cmd+Shift+D

Drag to Resize

Mouse drag

Navigate

Cmd+Opt+Arrow

arb — ~/projects/api

~/projects/api on main v20.11.0

➤ claude "add rate limiting middleware to the auth routes"

Claude I'll add rate limiting to protect the auth endpoints.

Created src/middleware/rateLimit.ts (+38 lines)

Edited src/routes/auth.ts (+6 lines)

Edited src/app.ts (+2 lines)

✓ All changes applied. Tests passing.

~/projects/api on main * v20.11.0

➤ git diff src/routes/auth.ts

--- a/src/routes/auth.ts

+++ b/src/routes/auth.ts

@@ -1,4 +1,6 @@

import { Router } from 'express';

+import { rateLimit } from '../middleware/rateLimit';

const router = Router();

+router.use('/auth', rateLimit({ window: '15m', max: 10 }));

➤ git add . && git commit -m "feat: add rate limiting to auth"

[main a3f7c2d] feat: add rate limiting to auth

3 files changed, 46 insertions(+)

➤

Get Started

Ready in 3 steps

Install

Run brew tap szj2ys/arb && brew install arb. One command, no dependencies. Apple-notarized — opens without security warnings.

Open

Launch arb. Starship prompt, syntax highlighting, autosuggestions, and Delta diffs are already configured. Nothing to install or tweak.

Code

Start building. Use Claude Code, review diffs, navigate with z, split panes — everything works out of the box.

Comparison

How arb compares

Feature	arb	iTerm2	Alacritty	Kitty	Ghostty	Warp
Zero Config	✓	—	—	—	—	Partial
Built-in Tools	✓	—	—	—	—	—
GPU Rendering	✓	Partial	✓	✓	✓	✓
Lua Scripting	✓	—	—	✓	—	—
No Login Required	✓	✓	✓	✓	✓	—
Open Source	✓	✓	✓	✓	✓	—
Binary Size	~40 MB	~55 MB	~15 MB	~30 MB	~15 MB	~90 MB
Shell Bootstrap	~100 ms	~250 ms	~120 ms	~130 ms	~110 ms	~200 ms
Built-in Tools Count	6	0	0	0	0	3

$ brew tap szj2ys/arb && brew install arb

Try in 10 seconds — works with any shell

Batteries Included

Everything pre-installed

Starship

Minimal, fast, and infinitely customizable cross-shell prompt.

z

Smart directory jumping. Navigate to any folder by typing partial names.

Delta

Beautiful syntax-highlighted diffs with line numbers and side-by-side view.

Syntax Highlighting

Real-time command syntax coloring for instant visual feedback.

Autosuggestions

Fish-like suggestions based on your history. Accept with right arrow.

Completions

Tab completions for commands, paths, and arguments out of the box.

FAQ

Frequently asked questions

What makes arb different from iTerm2?

arb ships with a complete shell suite (Starship, z, Delta, syntax highlighting, autosuggestions) pre-configured. iTerm2 requires you to install and configure each tool separately. arb also has GPU-accelerated rendering and a smaller binary (~40 MB vs ~55 MB).

Does arb work with Claude Code and AI tools?

Yes. arb supports Claude Code, GitHub Copilot, Aider, and other AI coding tools. Fast shell boot (~100ms), built-in Delta for reviewing AI-generated diffs, and native split-pane support make it ideal for AI-assisted development.

Is arb free and open source?

Yes. arb is MIT-licensed and fully open source. No login required, no account needed, no telemetry. The source code is on GitHub.

How do I customize arb?

A single Lua config file at ~/.config/arb/arb.lua controls fonts, colors, key bindings, and behavior. Defaults are tuned for most developers, so customization is optional.

Can I migrate from WezTerm?

Yes. arb uses the same Lua configuration format as WezTerm. Most configs work with minimal changes. arb adds built-in shell tools, a smaller binary, and opinionated defaults.

Ready to start?

Install arb in seconds. Apple-notarized, no security warnings.

$ brew tap szj2ys/arb && brew install arb

or Download from GitHub Releases

Learn More

Resources

Guides to help you get the most out of AI-powered terminal workflows.

Terminal built
for AI coding