Element Call

🎬 Live Demo 🎬

The world's first 🌐 decentralized and 🤝 federated video conferencing solution powered by the Matrix protocol.

📌 Overview

Element Call is a native Matrix video conferencing application developed by Element, designed for secure, scalable, privacy-respecting, and decentralized video and voice calls over the Matrix protocol. Built on MatrixRTC (MSC4143), it utilizes MSC4195 with LiveKit as its backend.

You can find the latest development version continuously deployed to call.element.dev.

Note

For prior version of the Element Call that relied solely on full-mesh logic, check full-mesh branch.

✨ Key Features

✅ Decentralized & Federated – No central authority; works across Matrix homeservers.
✅ End-to-End Encrypted – Secure and private calls.
✅ Standalone & Widget Mode – Use as an independent app or embed in Matrix clients.
✅ WebRTC-based – No additional software required.
✅ Scalable with LiveKit – Supports large meetings via SFU (MSC4195: MatrixRTC using LiveKit backend).
✅ Raise Hand – Participants can signal when they want to speak, helping to organize the flow of the meeting.
✅ Emoji Reactions – Users can react with emojis 👍️ 🎉 👏 🤘, adding engagement and interactivity to the conversation.

🚀 Deployment Options

Element Call can be packaged in two ways:

Full Package – Supports both Standalone and Widget mode. Hosted as a static web page and accessed via a URL when used as a widget.

Embedded Package – Designed for Widget mode only. Bundled with a messenger app for seamless integration. This is the recommended method for embedding Element Call into a messenger app.

See the here for more information on the packages.

Standalone mode

In Standalone mode Element Call operates as an independent, full-featured video conferencing web application, allowing users to join or host calls without requiring a separate Matrix client.

Widget mode embedded in Messenger Apps

Element Call can be embedded as a widget inside apps like Element Web or Element X (iOS, Android), bringing MatrixRTC capabilities to messenger apps for seamless decentralized video and voice calls within Matrix rooms.

Important

Embedded packaging is recommended for Element Call in widget mode!

🛠️ Self-Hosting

For operating and deploying Element Call on your own server, refer to the Self-Hosting Guide.

🧭 MatrixRTC Backend Discovery and Selection

For proper Element Call operation each site deployment needs a MatrixRTC backend setup as outlined in the Self-Hosting. A typical federated site deployment for three different sites A, B and C is depicted below.

Backend Discovery

MatrixRTC backend (according to MSC4143) is announced by the Matrix site's .well-known/matrix/client file and discovered via the org.matrix.msc4143.rtc_foci key, e.g.:

"org.matrix.msc4143.rtc_foci": [
    {
        "type": "livekit",
        "livekit_service_url": "https://matrix-rtc.example.com/livekit/jwt"
    },
]

where the format for MatrixRTC using LiveKit backend is defined in MSC4195. In the example above Matrix clients do discover a focus of type livekit which points them to a Matrix LiveKit JWT Auth Service via livekit_service_url.

Backend Selection

• Each call participant proposes their discovered MatrixRTC backend from org.matrix.msc4143.rtc_foci in their org.matrix.msc3401.call.member state event.
• For LiveKit MatrixRTC backend (MSC4195), the first participant who joined the call defines via the foci_preferred key in their org.matrix.msc3401.call.member which actual MatrixRTC backend will be used for this call.
• During the actual call join flow, the LiveKit JWT Auth Service provides the client with the LiveKit SFU WebSocket URL and an access JWT token in order to exchange media via WebRTC.

The example below illustrates how backend selection works across Matrix federation, using the setup from sites A, B, and C. It demonstrates backend selection for Matrix rooms 123 and 456, which include users from different homeservers.

🌍 Translation

If you'd like to help translate Element Call, head over to Localazy. You're also encouraged to join the Element Translators space to discuss and coordinate translation efforts.

🛠️ Development

Frontend

To get started clone and set up this project:

git clone https://github.com/element-hq/element-call.git
cd element-call
corepack enable
yarn

To use it, create a local config by, e.g., cp ./config/config.devenv.json ./public/config.json and adapt it if necessary. The config.devenv.json config should work with the backend development environment as outlined in the next section out of box.

Note

Be aware, that this config.devenv.json is exposing a deprecated fallback LiveKit config key. If the homeserver advertises SFU backend via .well-known/matrix/client this has precedence.

You're now ready to launch the development server:

yarn dev

See also:

• Developing with linked packages

Backend

A docker compose file dev-backend-docker-compose.yml is provided to start the whole stack of components which is required for a local development environment:

• Minimum Synapse Setup (servername: synapse.localhost)
• LiveKit JWT Service (Note requires Federation API and hence a TLS reverse proxy)
• Minimum TLS reverse proxy (servername: synapse.localhost) Note certificates are valid for at least 10 years from now
• Minimum LiveKit SFU Setup using dev defaults for config
• Redis db for completeness

These use a test 'secret' published in this repository, so this must be used only for local development and never be exposed to the public Internet.

Run backend components:

yarn backend
# or  for podman-compose
# podman-compose -f dev-backend-docker-compose.yml up

Playwright tests

Our Playwright tests run automatically as part of our CI along with our other tests, on every pull request.

You may need to follow instructions to set up your development environment for running Playwright by following https://playwright.dev/docs/browsers#install-browsers and https://playwright.dev/docs/browsers#install-system-dependencies.

However the Playwright tests are run, an element-call instance must be running on https://localhost:3000 (this is configured in playwright.config.ts) - this is what will be tested.

The local backend environment should be running for the test to work: yarn backend

There are a few different ways to run the tests yourself. The simplest is to run:

yarn run test:playwright

This will run the Playwright tests once, non-interactively.

There is a more user-friendly way to run the tests in interactive mode:

yarn run test:playwright:open

The easiest way to develop new test is to use the codegen feature of Playwright:

npx playwright codegen

This will record your action and write the test code for you. Use the tool bar to test visibility, text content and clicking.

Investigate a failed test from the CI

In the failed action page, click on the failed job, then scroll down to the upload-artifact step. You will find a link to download the zip report, as per:

Artifact playwright-report has been successfully uploaded! Final size is 1360358 bytes. Artifact ID is 2746265841
Artifact download URL: https://github.com/element-hq/element-call/actions/runs/13837660687/artifacts/2746265841

Unzip the report then use this command to open the report in your browser:

npx playwright show-report ~/Downloads/playwright-report/

Under the failed test there is a small icon looking like "3 columns" (next to the test name file name), click on it to see the live screenshots/console output.

Test Coverage

Add a new translation key

To add a new translation key you can do these steps:

1. Add the new key entry to the code where the new key is used: t("some_new_key")

2. Run yarn i18n to extract the new key and update the translation files. This will add a skeleton entry to the locales/en/app.json file:

   {
       ...
       "some_new_key": "",
       ...
   }
   

3. Update the skeleton entry in the locales/en/app.json file with the English translation:

   {
       ...
       "some_new_key": "Some new key",
       ...
   }
   

📖 Documentation

Usage and other technical details about the project can be found here:

Docs

📝 Copyright & License

Copyright 2021-2025 New Vector Ltd

This software is dual-licensed by New Vector Ltd (Element). It can be used either:

(1) for free under the terms of the GNU Affero General Public License (as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version); OR

(2) under the terms of a paid-for Element Commercial License agreement between you and Element (the terms of which may vary depending on what you and Element have agreed to). Unless required by applicable law or agreed to in writing, software distributed under the Licenses is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Licenses for the specific language governing permissions and limitations under the Licenses.