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multAIplayer
Built with Codex, together
Free, open source macOS app and CLI for trusted teams to build with Codex, together: discuss the work, steer a shared local Codex session, review changes, and hand hosting between teammates. Built-in in the desktop app: Monaco editing and diffs, xterm.js terminals, web previews, Git, PRs, room-wide local development previews using Cloudflare Quick Tunnels, and CI. Encrypted with (unaudited) RFC 9420 MLS via mls-rs. Free hosted relay, + the option to self-host. Current Codex account needed.
Hey everyone! I'm so excited for you to check out multAIplayer!
multAIplayer is basically multiplayer Codex for trusted teams: discuss the work, steer one shared local Codex session, review what it changes, and hand hosting between teammates.
And, yes, the name was originally supposed to be just for development, but it stuck and was available haha!
Some details on multAIplayer:
Built-in in the desktop app: Monaco editing and diffs, xterm.js terminals, web previews, Git, PRs, room-wide local development previews using CloudFlare Quick Tunnels, and CI.
Encrypted with (unaudited) RFC 9420 MLS via mls-rs.
Teamwork is shared over a free hosted relay, with the option to self-host as well!
Built on the Codex app-server
multAIplayer does not use a custom system prompt. It sends host-approved room context as normal Codex turn input, while the active host controls the local project, sandbox, tools, and approvals.
When a host needs to step away (or runs out of Codex usage) a teammate can take over using their own machine, Codex access, and project checkout.
The open-source macOS Alpha is for trusted-team testing (or you can self-host it and go wild).
Not associated with OpenAI. Existing Codex subscription needed to host a room.
Thank you for checking it out!
About multAIplayer on Product Hunt
“Built with Codex, together”
multAIplayer was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #136 on the daily leaderboard. Free, open source macOS app and CLI for trusted teams to build with Codex, together: discuss the work, steer a shared local Codex session, review changes, and hand hosting between teammates. Built-in in the desktop app: Monaco editing and diffs, xterm.js terminals, web previews, Git, PRs, room-wide local development previews using Cloudflare Quick Tunnels, and CI. Encrypted with (unaudited) RFC 9420 MLS via mls-rs. Free hosted relay, + the option to self-host. Current Codex account needed.
On the analytics side, multAIplayer competes within Open Source, Developer Tools, GitHub and OpenAI Day — topics that collectively have 626.3k followers on Product Hunt. The dashboard above tracks how multAIplayer performed against the three products that launched closest to it on the same day.
Who hunted multAIplayer?
multAIplayer was hunted by Maddie D. Reese. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of multAIplayer including community comment highlights and product details, visit the product overview.
Maddie D. Reese