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Developer tool for macOS & Windows

Terminal, browser and AI in a single window.

Peer is a dev environment built around Claude Code. See your app, inspect any element and send full context to the AI — without switching tabs or copying code.

Requires Claude Code installed.

Peer app showing terminal, browser and mobile preview

A dedicated workspace for AI-assisted development.

Peer combines a terminal, a live browser and an AI-powered inspector into one seamless interface. No browser tabs juggling, no manual copy-paste. Open your project, run the dev server and start building — with Claude as your pair programmer.

Core experience:
  • Terminal + Browser
  • AI Inspector
  • Mobile Preview
  • Multi-Project Tabs

Features

01. Dual Terminal

Two independent terminals in the same panel.

  • • Claude tab — runs Claude Code automatically on open
  • • Dev Server tab — isolated process for your dev server
  • • Auto-detects localhost port from server output
  • • Browser reloads when the server is ready

02. AI Inspector + React Grab

Click any element and send full context to Claude. Powered by React Grab for deep component introspection.

  • • HTML, computed CSS, matched rules and box model
  • • React Grab extracts component name, file and line number
  • • Walks the React fiber tree for full component metadata
  • • Accessibility tree and ARIA attributes
  • • Formatted markdown sent directly to Claude Code

03. Mobile Preview

Test responsive layouts without leaving the app.

  • • iPhone, iPad and custom device presets
  • • Real device emulation via Chromium API
  • • Scales to fit available space
  • • Syncs navigation with main browser

04. Smart Setup

Open a project and start coding in seconds.

  • • Detects Node.js, package manager and scripts
  • • Installs dependencies when needed
  • • Per-project settings persisted automatically
  • • nvm version selection per project

How it works

01 Open a project folder. Peer scans and configures the environment.
02 Code with Claude in the terminal while the browser shows your app live.
03 Inspect any element. Full HTML, CSS and React context is sent to Claude.
04 Ship faster. Less context-switching, more building.

Keyboard shortcuts

Toggle element inspector Cmd + Shift + C
Toggle DevTools Cmd + Option + I
New project tab Cmd + T
Close current tab Cmd + W
Peer

Start building with Peer

Free and open companion for Claude Code. Available for macOS and Windows.