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Third Room

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What Third Room is

Third Room is a free, open-source social platform for communicating and collaborating in immersive 3D worlds. Communities can create public or private worlds, invite people, and manage privacy, roles, and permissions. Built on Matrix, it supports communication with users on other Matrix-compatible platforms, including Element. Its getting started guide describes communication as end-to-end encrypted, with messages and files accessible only to intended recipients. Users can choose the default or another homeserver, or run their own; data is distributed across homeservers. The single-page web client can be hosted on a static web server, while a personal Matrix homeserver is optional. Third Room supports desktop and XR, guest access, and spatial audio. Creators can make glTF content and use the Unity exporter for lightmaps, spawn points, and physics. Interactive scripting is available through the Web Scene Graph API with WebAssembly-compatible languages, alongside a JavaScript runtime and in-world editor. The creator guide recommends binary glTF scenes under 50 MB, and the Unity exporter guide lists three material extensions not yet supported.

Who it suits

Third Room suits communities that want to gather, collaborate, or host events in shared 3D worlds. It also addresses creators and developers building glTF content and interactive world scripts.

What it does well

  • Public and private worlds support roles and permissions.
  • Matrix interoperability reaches users on compatible platforms.
  • Supports desktop, XR, guest access, and spatial audio.
  • Web client can be hosted on a static server.

What to know first

  • Creator guide recommends binary glTF scenes under 50 MB.
  • Three listed material extensions are not yet supported.
  • Running a personal homeserver is an available setup choice.

Limits

The creator guide recommends binary glTF scene files under 50 MB. The Unity exporter does not yet support KHR_materials_iridescence, KHR_materials_specular, or KHR_materials_clearcoat.

Getting started

  1. Open the Third Room website
  2. Use the web client or host the single-page app on a static web server
  3. Choose the default homeserver, another listed homeserver, or set up your own
  4. Create or join a public or private world
  5. Invite participants and configure privacy, roles, and permissions
  6. Upload binary glTF scenes below the recommended 50 MB size

Verdict

Third Room brings Matrix communication and world-building tools into immersive 3D spaces. Creators should check its scene-size recommendation and listed material-extension gaps.

Questions

Is Third Room free?

Yes. It is free and open source.

Which platforms does it support?

Third Room supports the web, desktop use, and XR. The client can be self-hosted on a static web server.

Can users communicate with Element users?

Yes. Third Room is built on Matrix and supports communication with other Matrix-compatible platforms, including Element.

Is communication encrypted?

The getting-started guide describes communication as end-to-end encrypted, with messages and files accessible only to intended recipients.

Can I run my own homeserver?

Yes. You can choose the default or another listed homeserver, or set up your own. Running your own Matrix homeserver is optional.

What can creators build with?

Creators can use glTF and the Unity exporter, while developers can use the Web Scene Graph API, WebAssembly-compatible languages, JavaScript, and the in-world editor.

Facts from Third Room's own pages

3D content
Third Room supports glTF content and recommends its Unity exporter, which can bake lightmaps, set spawn points, and add physics to objects. · thirdroom.io, 9 Oct 2026
Audience
The homepage presents Third Room for communities to gather, share, collaborate, host events, and explore 3D concepts, including architecture and industrial design use cases. · thirdroom.io, 4 Oct 2026
Content limit
The creator guide recommends uploading binary glTF scenes under 50 MB. · thirdroom.io, 4 Oct 2026
Creators
Creators can build 3D content in glTF and use the Unity exporter to add features such as lightmaps, spawn points, and physics. · thirdroom.io, 4 Oct 2026
Decentralization
Users can choose a homeserver, including setting up their own, and the guide says data is distributed across homeservers. · thirdroom.io, 4 Oct 2026
Developer tools
The Web Scene Graph API supports interactive world scripting from WebAssembly-compatible languages, with JavaScript runtime and an in-world editor also available. · thirdroom.io, 4 Oct 2026
Encryption
The documentation says communication is protected by end-to-end encryption so messages and files can be accessed only by intended recipients. · thirdroom.io, 9 Oct 2026
Homeservers
Users can choose Third Room’s default homeserver, another listed homeserver, or set up their own. · thirdroom.io, 9 Oct 2026
Matrix
Third Room is built on Matrix and supports communication with users on other platforms that support Matrix. · thirdroom.io, 4 Oct 2026
Matrix interoperability
Third Room users can communicate with people on other platforms that support Matrix, including Element. · thirdroom.io, 9 Oct 2026
Networking
Third Room uses Matrix Group VoIP Calls for networking and voice chat, and its WebSG networking API uses peer-to-peer WebRTC data channels. · thirdroom.io, 4 Oct 2026
Notable compatibility limits
The Unity exporter guide says Third Room does not yet support KHR_materials_iridescence, KHR_materials_specular, or KHR_materials_clearcoat extensions. · thirdroom.io, 9 Oct 2026
Purpose
Third Room is an open-source social platform for communicating and collaborating in immersive 3D worlds. · thirdroom.io, 4 Oct 2026
Scripting
The Web Scene Graph API supports WebAssembly-compatible languages, and Third Room includes a JavaScript runtime and in-world script editor. · thirdroom.io, 9 Oct 2026
Self-hosting
The open-source web client can be self-hosted as a single-page app on any static web server; hosting a Matrix homeserver is optional. · thirdroom.io, 9 Oct 2026
Support
The documentation directs users with questions or feedback to the Third Room Matrix chat. · thirdroom.io, 9 Oct 2026
Voice and networking
Third Room uses Matrix Group VoIP Calls for networking and voice chat; its developer guide recommends a TURN server such as Coturn for connections across all networking scenarios. · thirdroom.io, 9 Oct 2026
What it does
Third Room is an open-source social platform for communicating and collaborating in immersive 3D worlds, built on Matrix. · thirdroom.io, 9 Oct 2026
Worlds
Users can create and join public or private worlds for discussions, project collaboration, and events. · thirdroom.io, 9 Oct 2026
World upload limit
The creator guide recommends uploading binary glTF scene files under 50 MB. · thirdroom.io, 9 Oct 2026
XR
The getting started guide describes support for desktop and XR. · thirdroom.io, 4 Oct 2026

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