multAIplayergroup chat for CodexDownload alpha

Build with Codex.
Together.

A completely free, open-source team room for the conversation, code, tools, and decisions around a shared Codex session.

Download for macOS ↗View on GitHub ↗
Host a roomCodex account + active subscription required
Sign inGitHub account required

Built on the open-source Codex app-server · Self-hostable relay · Made by @maddiedreese ↗

multAIplayer encrypted room
A multAIplayer project room showing team chat, Codex activity, project controls, and room members
Active hostMaddieapproved
✣
Codex is working3 teammates following
01 One room, shared momentum

Pair programming grew up.
Now it has a whole team.

multAIplayer keeps the people and the agent in the same loop—without turning your local machine into an invisible shared service.

01

A room around the work

Chat, project files, diffs, terminals, browser previews, Git, and Codex activity stay together in one project room.

02

Codex, with a human boundary

Anyone can propose a turn. The active host sees the exact context and approves execution on their machine.

03

Pick up when a host steps away

Hand off hosting when someone leaves or reaches a usage limit. The next host uses their own machine and Codex access.

04

From conversation to pull request

Review changes, create a branch, commit, push, open a draft PR, and follow GitHub Actions without losing the room’s context.

multAIplayer · light room live
The current multAIplayer light interface with room tools, team chat, files, and GitHub workflow context
02 The host stays in control

Shared context.
Explicit authority.

Teammates can ask, inspect, and follow along. The active host reviews what Codex will receive and decides what can touch their machine.

  1. 1
    Someone proposes a turnThe room sees the request and its place in the queue.
  2. 2
    The host reviews contextProject, chat, attachments, terminal, browser, and sandbox are visible before approval.
  3. 3
    Everyone follows the resultRoom-safe lifecycle events and project changes stay in view.
03 Private by design

Your relay moves the room.
It doesn’t read the work.

Room content is encrypted on devices. Powerful local capabilities remain with the host who owns the machine, project, accounts, and approvals.

  • ✓Room messages and attachments are encrypted before they reach the relay.
  • ✓Codex and OpenAI credentials stay on the active host’s machine.
  • ✓Project files, terminal output, and browser contents are not stored as relay plaintext.
  • ✓Terminal, browser, file-write, Git, and Codex actions stay behind host approval.
Read the threat model ↗
ROOM TRAFFIC
M
Maddieactive host
S
Samteammate
P
Priyateammate
◈relayciphertext + routing metadata

Plaintext stays on participating devices

HOST MACHINE
Project
Codex
Terminal
Browser
04 Open source, from day one

See how the room works.
Run the relay yourself.

Inspect the protocol, crypto boundaries, desktop client, and relay. Self-host for your team or help shape the public alpha in the open.

Explore the repository ↗Self-hosting guide
terminalApache-2.0
$ git clone https://github.com/maddiedreese/multAIplayer.git
$ cd multAIplayer
$ docker build -f apps/relay/Dockerfile .
# Your room. Your relay. Your call.
05 Good questions

Before you
open a room.

What accounts do I need?+

A GitHub account is required to sign in. To host a room, you also need a ChatGPT account with Codex access and an active plan or subscription. multAIplayer uses the host’s local Codex session, so no separate OpenAI API key is required.

Is multAIplayer an OpenAI or Codex product?+

No. multAIplayer is an independent open-source project and is not affiliated with, endorsed by, or sponsored by OpenAI. The OpenAI and Codex names belong to OpenAI.

Is multAIplayer free and open source?+

Yes. The multAIplayer desktop app and self-hostable relay are completely free and open source under the Apache-2.0 license. A separate paid ChatGPT plan or subscription may still be required for a host’s Codex access.

Can I self-host the relay?+

Yes. The relay is open source and can be self-hosted. The official hosted relay is provided for the easiest first run.

What platforms are supported?+

The first public alpha supports macOS. Additional platforms are not available yet.

Is it ready for sensitive production work?+

Not yet. This is a public alpha. Teams should review the threat model and known limitations before using private, regulated, or high-stakes projects.

multAIplayer icon
Public alpha

Bring the whole team
into the loop.

Download the macOS alpha and start a room around your next build.

Download for macOS ↗Completely free and open source · GitHub account required to sign inHosting requires a Codex account with an active subscription