Offrun: one Mac window for Claude Code, Codex and more

Offrun is a new Mac app from Founderly, a software company. It runs several AI coding agents side by side in one window: Claude Code (Anthropic's coding agent), Codex (OpenAI's coding agent), Google's antigravity-CLI (labeled AGY inside the app), and xAI's Grok Build. The Offrun website lists two more agents, Pi and OpenCode, as "coming soon."

Installation, as described by the developers, takes three steps: install the app and drag it into the Applications folder, open settings and connect agent accounts, then pick a project and give an agent a task. Each agent signs in with the user's own account at its vendor, so code travels straight from the Mac to Anthropic, OpenAI, Google, or xAI. According to the company, Offrun itself does not sit as a server on that path and never gets access to the user's keys.

One feature lets a user pick a single agent to act as reviewer for another. Before changes are committed — meaning saved permanently into the project's history — the chosen reviewer checks the other agent's diff, a listing of exactly what code changed. This is not something every agent does automatically; the user must assign who reviews whom. The findings appear right in the chat, nothing merges by itself, and the final call stays with the user.

For someone who already pays for subscriptions to two or three different coding agents, checking their work side by side in one window is more convenient than switching between terminal tabs by hand.

Offrun itself is free and adds no subscription or key of its own — it only uses the agent accounts a user already pays for, so actual costs don't change. It requires a Mac with Apple Silicon and macOS 14 or newer. The app's source code is closed, so using it means trusting a binary with access to a user's coding sessions.