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Juno
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Computer use agents

Juno vs OpenAI Codex

A sandbox cannot fill in your job application, because it does not have your resume. Juno runs on the real desktop, which is the point and the tradeoff.

Both Juno and Codex let an AI use a computer: take a screenshot, click, type, navigate. How they do it differs enough that they barely compete.

Codex works in a cloud sandbox. The model gets a virtual desktop inside OpenAI's infrastructure, walled off from your machine. It cannot see your screen, open your files or use your apps. The upside is that it cannot break anything either.

Juno runs on your actual Mac. It sees your real screen, moves your real mouse and types on your real keyboard, with your browser, your logins and your files. The upside is that it can finish real work. The tradeoff is that you have to trust it with your desktop.

Side by side

  • Where it runs

    Juno
    Your actual Mac

    OpenAI Codex
    A cloud sandbox

  • How it acts on screen

    Juno
    Accessibility APIs, with screenshots

    OpenAI Codex
    Screenshots and coordinate clicks

  • Click verification

    Juno
    Checks the element is really there

    OpenAI Codex
    Coordinates, unverified

  • Your apps and logins

    Juno
    Yes, the real ones

    OpenAI Codex
    No, the sandbox is empty

  • Your files

    Juno
    Yes, your real folders

    OpenAI Codex
    Sandbox filesystem only

  • Voice

    Juno
    Built in, local Whisper

    OpenAI Codex
    No

  • Parallel agents

    Juno
    Desktop, browser and file agents

    OpenAI Codex
    Background sessions in the cloud

  • Model

    Juno
    Anthropic Computer Use, or bring your own

    OpenAI Codex
    OpenAI

  • Platforms

    Juno
    macOS 14+

    OpenAI Codex
    Any, it runs in the cloud

  • Source code

    Juno
    Public, FSL-1.1-MIT

    OpenAI Codex
    Closed

  • Price

    Juno
    Free app, you bring the model

    OpenAI Codex
    ChatGPT subscription

Where OpenAI Codex is the better pick

  • Writing and debugging code in isolation, which is what it was built for.
  • Anywhere sandboxing is a hard safety requirement rather than a preference.
  • Windows and Linux. Juno is macOS only.
  • Running several long jobs in the background without touching your screen.
  • You already pay for ChatGPT and do not want another tool in the path.

Where Juno pulls ahead

  • Anything needing your real desktop: your files, your logins, your installed apps.
  • Multi app work across browser, Finder and a spreadsheet at once.
  • Starting a task by voice, hands free.
  • Source you can read and change.
  • Escape stops it instantly, companion mode watches without clicking, and every action is logged.

The real difference is native versus sandboxed

This is not a better or worse comparison, it is a different job comparison. A sandbox is the right call for code, where you genuinely do not want an agent running commands against your real system while it works. But the same isolation makes desktop work impossible. You cannot fill in a job application from a sandbox, because the sandbox does not have your resume, your cookies or your saved passwords. You cannot tidy your Downloads folder from a sandbox, because it does not have your files. Juno exists for the tasks that need the real machine.

Clicking: accessibility tree versus coordinates

When Codex clicks, it sends coordinates derived from a screenshot. If that screenshot is slightly stale, or the layout shifted underneath it, the click lands on nothing. Juno checks first. Before clicking it asks the macOS accessibility tree what is actually at those coordinates, and if there is a real interactive element there, a button or a link or a text field, it uses the native press action rather than a raw click. If the element moved a little, the action still finds it. If nothing interactive is there, it falls back to an ordinary click. That is why it holds up better against animations and dynamic layouts.

For developers, use both

Juno ships a CLI, npx juno-cua, that works as an MCP server. Your coding agent, whether that is Claude Code, Cursor or Codex itself, can use Juno to see and operate your real desktop while continuing to run in its own environment. Write the code in the sandbox, then watch it work on your actual screen.

Questions people ask

What is the difference between Juno and Codex computer use?
Codex drives a virtual desktop in the cloud, isolated from your machine. Juno drives your real Mac, with your apps, files and logins. Codex is safer because it is sandboxed and limited for the same reason. Juno can do real work and asks for real trust.
Which is better for desktop automation?
Juno, because the tasks worth automating on a desktop are the ones involving your own data. For code work in an isolated environment, Codex, because isolation is exactly what you want there.
Does Juno use OpenAI or Anthropic?
It is built on Anthropic's Computer Use, and you can connect the Claude Pro or Max plan you already pay for through the Claude CLI rather than a separate API key. You can also paste an OpenAI key, and more providers are on the way.

Free, and the source is public. macOS 14+.

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