The Problem

Why Most Terminals Fail with Claude Code

Claude Code is transforming how developers write software. But the terminal you run it in matters more than you think. AI coding agents produce massive output — hundreds of file edits, long diffs, and rapid context switches — and most terminals were never designed for this workload.

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Slow Rendering

Traditional terminals choke on the volume of output Claude Code produces. Scrollback stutters, frames drop, and you lose time waiting for the terminal to catch up.

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Configuration Hell

iTerm2 requires hours of setup. Fonts, themes, plugins, shell integrations — all manual. When Claude Code is ready to work, your terminal is still loading plugins.

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Missing Dev Tools

Need syntax-highlighted diffs? Install Delta. Want a smart prompt? Install Starship. Directory jumping? Install zoxide. Each tool is another config file to maintain.

%

Slow Startup

Shell boot times of 500ms+ add up across dozens of daily sessions. When Claude Code needs to spawn subshells, every millisecond of startup latency compounds.

The Solution

How arb Solves These Problems

arb is a terminal emulator purpose-built for the AI coding era. It ships a 40MB binary with everything you need — no plugins, no dotfile configuration, no package managers. Open it, and it works.

G

GPU-Accelerated Rendering

Metal-backed rendering handles massive output streams without dropping frames. Claude Code can dump 10,000 lines and arb keeps scrolling smooth.

0

Zero Configuration

No .zshrc tweaks, no plugin managers, no font downloads. arb includes a Nerd Font, a modern color scheme, and sensible defaults from the first launch.

S

Built-in Starship Prompt

Starship is compiled in — not installed separately. Git status, language versions, and execution time appear instantly with zero shell overhead.

D

Built-in Delta & z

Syntax-highlighted diffs (Delta) and smart directory jumping (z) are built in. The tools Claude Code's workflow depends on, ready from the first session.

L

Lua Scripting

Customize keybindings, appearance, and behavior with Lua. No proprietary config format — a real programming language for when you need to go deep.

B

100ms Shell Boot

Your shell is ready before your fingers leave the keyboard. Spawn new tabs, split panes, and run subshells with imperceptible latency.

arb — Claude Code session
~ arb on main
$ claude
Claude Code v1.2.0
Connected. Type your request...
> Refactor the auth module to use JWT tokens
I'll refactor the auth module. Let me read the current code...
Editing 4 files... Done (2.3s)
$ git diff --stat
src/auth.rs | 47 +++++++++------
src/token.rs | 23 +++++++
src/config.rs | 8 ++-
tests/auth.rs | 31 ++++++++++
4 files changed, 82 insertions(+), 27 deletions(-)
$
Comparison

arb vs iTerm2 vs Warp vs Ghostty for AI Coding

Here is how arb stacks up against the most popular macOS terminals when used specifically for AI coding workflows like Claude Code, GitHub Copilot CLI, and other LLM-powered tools.

Feature arb iTerm2 Warp Ghostty
GPU-accelerated rendering ✓ — ✓ ✓
Shell boot time ~100ms ~400ms ~300ms ~200ms
Built-in Starship prompt ✓ — — —
Built-in Delta (diffs) ✓ — — —
Built-in z (dir jumping) ✓ — — —
Zero config required ✓ — ✓ —
Nerd Font included ✓ — ✓ —
Lua scripting ✓ — — —
No account / login ✓ ✓ — ✓
No telemetry ✓ ✓ — ✓
Open source (MIT) ✓ ✓ — ✓
Binary size ~40MB ~60MB ~200MB ~15MB

arb vs iTerm2 for Claude Code

iTerm2 has been the default macOS terminal for over a decade, but it was designed for a pre-AI world. It relies on CPU-based rendering, which visibly stutters when Claude Code produces large output streams. You need to manually install a Nerd Font, configure Starship, install Delta, set up zoxide, and tweak dozens of preferences before it feels modern.

arb ships all of these built-in. There is nothing to install, nothing to configure, and the GPU-accelerated renderer handles Claude Code's output without breaking a sweat. If you are tired of maintaining a 200-line .zshrc, arb is the upgrade.

arb vs Warp for Claude Code

Warp is a modern, GPU-accelerated terminal with a polished UI. However, it requires an account and login, collects telemetry, and is not open source. For developers who value privacy and transparency — especially when running AI tools that process codebases — this can be a dealbreaker.

arb is MIT-licensed, collects zero telemetry, requires no login, and ships with the same zero-config philosophy. It also includes Starship, Delta, and z as built-in tools, which Warp does not. For Claude Code users who want a fast, private, and fully-equipped terminal, arb is the clear choice.

arb vs Ghostty for Claude Code

Ghostty is a fast, minimal terminal with excellent GPU rendering. It is a great choice if you prefer to build your own setup from scratch. But that is exactly the tradeoff: Ghostty gives you a blank canvas and expects you to install your own prompt, diff tool, directory jumper, font, and theme.

arb takes the opposite approach. It bundles a carefully selected set of tools — Starship, Delta, z, syntax highlighting, a Nerd Font — so you can start a Claude Code session immediately. If you want the fastest path from brew install to a productive AI coding session, arb gets you there in seconds.

FAQ

Frequently Asked Questions

arb is the best terminal for Claude Code. It is GPU-accelerated, boots your shell in under 100ms, and includes Starship, Delta, z, and syntax highlighting out of the box. Install with brew tap szj2ys/arb && brew install arb and start coding immediately.
Yes. arb requires zero configuration. Install it, open it, and run Claude Code. Starship prompt, syntax-highlighted diffs, directory jumping, and GPU-accelerated rendering are all built in and working from the first launch.
Yes. arb is MIT-licensed and fully open source. No account required, no telemetry, no tracking. You can inspect, fork, and contribute on GitHub.
For AI coding workflows, yes. iTerm2 uses CPU-based rendering which struggles with the volume of output AI tools produce. It also requires extensive manual setup. arb is GPU-accelerated, ships with built-in developer tools, and works out of the box with Claude Code, Copilot, and other AI coding assistants.
No. arb collects zero telemetry and does not require any account or login. Your terminal sessions and code remain completely private.
arb includes Starship (cross-shell prompt), Delta (syntax-highlighted diffs), z (smart directory jumping), syntax highlighting, a Nerd Font, and Lua scripting. All are compiled in and ready to use with zero setup.