Extera

A FluffyChat fork on steroids, aimed at adding more features.

Features

Core messaging

• Send/receive all kinds of messages: text, images, videos, voice, files, polls...
• Geolocation sharing with in-app map preview
• Push notifications
• Room moderation
• Custom emotes and stickers
• Spaces
• 1-to-1 voice/video calls
• Group calls compatible with Element Call (powered by LiveKit)

Security and privacy

• E2EE encryption using Matrix's libvodozemac
• Encrypted key backup
• Emoji verification and cross-signing

UI and design

• Dark mode
• AMOLED (pitch black) mode
• Customisable seed color & color scheme
• Material You design, partially inspired by Material 3 Expressive

Moderation

• Feature-rich group moderation (all Matrix features)
• Redacted message recovery (for Synapse admins)

Extera Exclusives

• Built-in message translation (toggleable)
• Built-in image editor
• More expressive profiles: "About", banner, Rich Presence (MSC4320)

Supported languages

Warning

We use LLMs for translating the app. Exceptions are English and Russian.

• English
• Russian
• Japanese
• German
• Spanish
• Korean
• Dutch

Other locales are not updated.

Building

Prerequisites

Before building, you should have:

1. Flutter SDK installed
2. matrix-dart-sdk in the same directory as Extera

Setup

The matrix dependency can be configured in two ways:

Way 1: Directory-based (recommended when developing both app & sdk) Make sure that you have matrix-dart-sdk cloned in the same parent directory.

$ ls
Extera    matrix-dart-sdk

Option 2: Git reference Make sure that pubspec.yaml has a Git reference like this:

matrix:
  git:
    url: https://github.com/ExteraApp/matrix-dart-sdk.git
    ref: main

Build Commands

Platform-specific build scripts are available in the scripts/ directory:

• ./scripts/build-appimage.sh - AppImage (Linux)
• ./scripts/build-linux.sh - Linux (Run only after build-appimage.sh)
• .\scripts\build-windows.ps1 - Windows

Prerequisites

Windows

Before building on Windows, install the following:

• Visual Studio Build Tools 2026 (or newer) with the "Desktop development with C++" workload — provides MSVC compiler and Windows SDK.
• CMake
• Rust (rustup)
• NASM
• OpenSSL
• Flutter SDK

Important

1. Make sure to run build as admin.
2. If you are in Russia, you won't be able to download some dependencies, what will result in build failure. Use helper programs which 'alter your internet traffic'.

License

This project is licensed under the AGPL-3.0 License. See the LICENSE file for details.

Resources

• Matrix room - Support room for Extera
• Matrix.org - The Matrix protocol specification
• FluffyChat - The original FluffyChat project
• matrix-dart-sdk - Dart SDK for Matrix (a fork of famedly/matrix-dart-sdk)