Robrix is a fast, powerful Matrix chat client written from scratch in Rust.

It brings some cool new features to the world of Matrix, like our signature "dockable tabs" layout that lets you view and interact with multiple rooms or threads simultaneously. This works just like your favorite multi-tab IDE or web browser, letting you keep tabs on as many conversations as you want.

Robrix stays sleek and smooth even under heavy usage. We designed it to be fast and light (but also feature-rich), as it's fully native on every platform: no Electron, no underlying web engine, no JavaScript, and no cruft. Scrolling through many rooms at once with millions of messages each is no problem. Native sliding sync logs you in quickly, and your rooms list fully syncs without a long wait. We also went to great lengths to ensure that Robrix's room timeline view is consistent and predictable; it won't unexpectedly jump around while loading messages, images, or other room content. We've always found this to be annoying in other chat apps.

Robrix is the flagship app of Project Robius, a framework for multi-platform application development in Rust, and is written atop the Makepad UI toolkit, which we also contribute to significantly.

Check out our most recent talks and presentations for more info:

• Robrix: a complex, multi-platform app in Rust for secure chat using Matrix (Rust China Conf 2025)
  • Videos: YouTube link, BiliBili Link
  • Slides: PowerPoint (13MB), PDF version (13MB)
• Robrix: a pure Rust multi-platform app for chat and beyond (GOSIM China 2024)
  • Videos: YouTube link, BiliBili link
  • Slides: PowerPoint (25MB), PDF version (6MB)
• An interview about Robrix on Matrix Live!
• Robrix: a Matrix chat client and more (GOSIM Europe 2024)
  • Videos: YouTube link, BiliBili link
  • Slides: PowerPoint (22MB), PDF version (16MB)

The following table shows which host systems can currently be used to build Robrix for which target platforms.

• Matrix-specific links (https://matrix.to/...) aren't fully handled in-app yet.
• Ignoring/unignoring a user clears all timelines (see: matrix-org/matrix-rust-sdk#1703); the timeline will be re-filled gradually via back pagination, but the viewport position is not maintained.

1. First, install Rust.

2. Install cmake, which is required for some Matrix SDK dependencies.

   • macOS: brew install cmake
   • Windows: choco install cmake (or install cmake using Visual Studio)
   • Linux: see step 3 below.

3. If you're building on Linux or WSL on Windows, install the required dependencies. Otherwise, proceed to step 4.

   • openssl, clang/libclang, cmake, binfmt, Xcursor/X11, asound/pulse.

   On a Debian-like Linux distro (e.g., Ubuntu), run the following:

   sudo apt-get update
   sudo apt-get install libssl-dev cmake llvm clang libclang-dev libsqlite3-dev pkg-config binfmt-support libxcursor-dev libx11-dev libasound2-dev libpulse-dev libwayland-dev libxkbcommon-dev

4. Then, build and run Robrix.

   cargo run --release

CC=clang CXX=clang++ cargo run --release

1. Install the cargo-makepad build tool:

   cargo install --force --git https://github.com/makepad/makepad.git --branch dev cargo-makepad

2. Use cargo-makepad to install the Android toolchain with the full NDK included:

   cargo makepad android install-toolchain --full-ndk

3. Build and run Robrix using cargo-makepad:

   cargo makepad android run -p robrix --release

   • You'll need to connect a physical Android device with developer options enabled, or start up an emulator using Android Studio.
     • API version 33 or higher is required, which is Android 13 and up.

2. Use cargo-makepad to install the iOS toolchain:

   rustup toolchain install nightly
   cargo makepad apple ios install-toolchain

3. Perform the following one-time setup steps:

   1. If running on a real iOS device, enable Developer Mode on your device: Settings → Privacy & Security → Developer Mode → turn on Developer Mode and reboot.
   2. Ensure your Apple Developer account is properly set up on your Mac.
   3. Create an empty "dummy" project in Xcode:
      • File → New → Project to create a new "App"
      • Set the Product Name as robrix. (used in the --org argument later)
      • Set the Organization Identifier to a value of your choice, e.g., rs.robius. (used in the --app argument later)
      • For Project Signing & Capabilities, select the proper Apple Developer team account.
   4. In Xcode, Build/Run this project once to install and run the app on the simulator (or device).
   5. Once the simulator or device has the empty "dummy" app installed and running properly, then you're ready to build the actual Robrix application below.

4. If you're using an iOS simulator, do the following:

   cargo makepad apple ios \
     --org=rs.robius \
     --app=robrix \
     run-sim -p robrix --release

xcodebuild -downloadPlatform iOS

4. Run the following command to show all provisioning profiles, signing identities, and device identifiers on your Mac.

   cargo makepad apple list

   • You must select which values you need to use for each of the 3 above items.
   • If you get an error from the above command, then please ensure you performed the full iOS setup instructions above, and that you have a valid Apple Developer account with certificates installed on your Mac.

5. Run the following command, filling in the unique starting characters chosen above.

   cargo makepad apple ios \
     --profile=<unique-starting-hex-string> \
     --cert=<UNIQUE_STARTING_HEX_STRING> \
     --device=<UNIQUE-STARTING-HEX-STRING> \
     --org=rs.robius \
     --app=robrix \
     run-device -p robrix –release

These are generally sorted in order of priority. If you're interested in helping out with anything here, please reach out via a GitHub issue or on our Robius matrix channel.

• View list of joined rooms
• View timeline of events in a single room
• Fetch and display room avatars
• Fetch user profiles (displayable names)
• Cache user profiles and avatars
• Cache fetched media on a per-room basis
• Fetch and display user profile avatars
• Backwards pagination to view a room's older history
• Dynamic backwards pagination based on scroll position/movement: #109
• Loading animation while waiting for pagination request: #109
• Stable vertical position of events during timeline update
• Display simple plaintext messages
• Display image messages (PNG, JPEG)
• HTML (rich text) formatting for message bodies
• Display reactions (annotations)
• Handle opening links on click
• Linkify plaintext hyperlinks
• Show reply previews above messages: #82
• Send standalone messages
• Interactive reaction button, send reactions: #115
• Show reply button, send reply: #83
• Edit existing messages
• E2EE device verification, decrypt message content: #116
• Re-spawn timeline as focused on an old event after a full timeline clear: #103

• Persistence of app session to disk: #112
• Username/password login screen: #113
• SSO, other 3rd-party auth providers login screen: #114
• Client logout, with server-side logout and app state reset: #432
• Side panel showing detailed user profile info (click on their Avatar)
• Ignore and unignore users (see known issues)
• Display read receipts besides messages: #162
• Mention users within a room (or the whole @room): #452
• Dedicated view of direct messages (DMs): #139
• Keyword filters for the list of all rooms: #123
• Collapsible/expandable view of contiguous "small" events: #118
• Display multimedia (audio/video/gif) message events: #120
• User settings screen
• Dedicated view of spaces: #636
• Link previews beneath messages: #81, #585
• Search messages within a room: #122
• Room browser, search for public rooms
• Accept/reject room invites
• Join room by accepting invite
• Join room by searching for room alias, room ID, or via a Matrix link
• Knock on room (request to join)
• Leave joined and invited rooms
• Room settings/info screen
• Room members pane
• Administrative abilities: ban, kick, etc
• Offline mode with persistent event cache: #445

1. Install cargo-packager:

rustup update stable  ## Rust version 1.79 or higher is required
cargo +stable install --force --locked cargo-packager

For posterity, these instructions have been tested on cargo-packager version 0.10.1, which requires Rust v1.79.

2. Install the robius-packaging-commands crate with the makepad feature enabled:

cargo install --locked --git https://github.com/project-robius/robius-packaging-commands.git

3. Then run the packaging command, which must build in release mode:

cargo packager --release ## --verbose is optional

• On Windows, the cmd prompt console is hidden automatically for packaged builds only. See the hide_windows_console cargo feature in our Cargo.toml.

Note that due to platform restrictions, you can currently only build:

• Linux packages on a Linux OS machine
• Windows installer executables on a Windows OS machine
• macOS disk images / app bundles on a macOS machine
• iOS apps on a macOS machine.
• Android, on a machine with any OS!

There are some additional considerations when packaging Robrix for macOS:

ERROR cargo_packager::cli: Error running create-dmg script: File exists (os error 17)

Creating disk image...
hdiutil: create failed - Operation not permitted
could not access /Volumes/Robrix/Robrix.app - Operation not permitted

After the command completes, you should see both the Robrix.app and the .dmg in the dist/ directory. You can immediately double-click the Robrix.app bundle to run it, or you can double-click the .dmg file to

Note that the .dmg is what should be distributed for installation on other machines, not the .app.

If you'd like to modify the .dmg background, here is the Google Drawings file used to generate the MacOS .dmg background image.

• X logo: https://www.vecteezy.com/png/42148611-new-twitter-x-logo-twitter-icon-x-social-media-icon (shobumiah)