Announcing Arc0: Your Coding Agent, in Your Pocket

by Arc0 Team

We're excited to announce Arc0—a mobile companion for the coding agents you already use.

The Problem We're Solving

Coding agents like Claude Code, Codex, and Gemini CLI have changed how developers work. You can describe what you want, and an AI writes the code. But there's a catch: these agents run on your laptop, in your terminal, connected to your dev environment.

And sometimes, they need you.

They ask clarifying questions. They hit an error and need guidance. They generate a diff that needs review before committing. And if you're not at your laptop—grabbing coffee, in a meeting, on a commute—the whole session stalls.

Your agent is waiting. Your flow is broken.

Why Not Just Code on the Web?

You might wonder: why not use web-based coding tools? Why does the agent need to run locally?

Here's the reality:

  1. Your dev environment is local. Your dependencies, your database, your API keys, your docker containers—they're on your machine or a remote server you control. Web-based editors can't run npm dev against your local setup.

  2. Verification requires local execution. To know if the code works, you need to run it. Build it. Test it. Hit your local API. Check the browser. That happens where your environment lives.

  3. Diffs need context. A meaningful code review requires understanding your codebase, your patterns, your history. That context lives in your local git repo.

  4. Security and privacy matter. Many teams can't push their code to third-party web services. The code stays local.

The agent needs to run where the work happens. But you don't always need to be there.

The Insight: You're an Architect Now

Here's what we've realized: with AI coding agents, your role has shifted.

You're no longer the typist. You're the architect.

You set direction. You answer questions. You review changes. You course-correct when things go sideways. That's high-value work—but it doesn't require a keyboard. It requires judgment.

And judgment travels with you.

With Arc0, you can guide your agent from your phone while it executes on your laptop. You're not writing code on mobile (that would be painful). You're making decisions, providing feedback, and keeping work moving.

Then, when you're back at your desk, you pick up where your agent left off—with code already written, reviewed, and ready to ship.

How Arc0 Works

Arc0 consists of two parts:

  1. Arc0 CLI — A daemon that runs on your local machine alongside your coding agent. It captures agent sessions, sets up a secure tunnel, and streams updates to your phone.

  2. Arc0 Mobile App — Available for iOS and Android. Shows your live session feed, lets you reply to agent questions, and provides a mobile-optimized diff viewer for code review.

The Bridge is open source. Self-host it, audit it, extend it. Your code never leaves your machine—Arc0 only streams the conversation and diffs.

What You Can Do with Arc0

  • Get notified when your agent needs input, hits an error, or finishes a task
  • Reply instantly to unblock your agent from anywhere
  • Review diffs with a mobile-optimized viewer—approve or request changes on the go
  • Follow along with a live feed of what your agent is doing
  • Stay in the loop without opening your laptop

Why Open Source

We believe developer tools should be transparent and controllable. Arc0 CLI is fully open source under MIT license. You can:

  • Self-host on your own infrastructure
  • Audit the code to verify security
  • Extend it for your workflow
  • Contribute improvements back

The Future of AI-Assisted Development

We're at an inflection point. AI coding agents are becoming genuinely useful—not just for boilerplate, but for real engineering work. But the tooling around them is still catching up.

Arc0 is our bet on what that tooling looks like: agents that run where your code lives, combined with mobile interfaces that let you stay connected without being chained to your desk.

Your dev environment stays on your machine. Your architectural decisions travel with you.

Get Started

Arc0 is available now:

We're just getting started. Come build with us.

Arc0 is open source and free. Built for developers who believe the best code is written where you work—and reviewed wherever you are.