Saturn Client is a free, source-available Minecraft client designed to enhance the gameplay experience while staying lightweight and customizable. Our goal is to build a clean, optimized client that the community can contribute to and improve together.

Saturn runs on Fabric and supports Minecraft 1.21.4 to 1.21.11 and 26.1 to 26.3, with one build per version (the 26.1 build also runs on 26.1.1 and 26.1.2). If something doesn't work on your version, please open an issue.

Features

Free cosmetics that don't require real money: cloaks, including animated ones, and hats
18 built-in mods: Armor Display, Auto Sprint, Clock, Coordinates, Crosshair, Day Counter, FPS Display, Freelook, Fullbright, Health Display, Keystrokes, Nametags, No Fog, Ping Display, Speedometer, Status Effects, TPS Display and Zoom
Clean and modern UI with animations
Ongoing performance improvements
Source-available and open to community contributions

Installation

Install Fabric Loader and Fabric API for your Minecraft version.
Download the Saturn Client jar for the same version from Modrinth or the releases page.
Put it in your mods folder.

Network use

For cosmetics, Saturn Client connects to the Saturn server (saturn-server.selimaj.dev). You're signed in the same way as on an online-mode Minecraft server: your client proves who you are to Mojang's session server, and the Saturn server asks Mojang to confirm it. Your Minecraft access token is only ever sent to Mojang, never to the Saturn server.

Building from source

The version-independent code lives in the common submodule, so clone with submodules:

git clone --recurse-submodules https://git.selimaj.dev/saturnclientmc/saturnclient.git
cd saturnclient

./gradlew buildAll                    # every version → build/allJars/
./gradlew :1.21.11:build              # a single version
./gradlew :1.21.11:runClient          # launch a development client

Building needs Java 21. The 26.x versions compile with Java 25, which Gradle downloads when it isn't installed.

Contributing

We welcome contributions of all kinds:

Code improvements
Bug fixes
UI enhancements
Cosmetic designs
Suggestions and feedback

If you're an artist or designer interested in helping with cosmetics or visual assets, we'd love to collaborate.

Most features belong in common, which every Minecraft version shares. For code that differs between versions, see the version guide: it covers how the versions share one copy of the code with Stonecutter, writing version-specific code, and adding a new Minecraft version. Every pull request is compiled for all versions automatically.

Credits

Cloak Rendering: IIpho3nix & Saturn
Who Am I: FokshaWasTaken
Emotes: modified versions of community Emotecraft emotes, credited to their authors
Black hole cloaks: variations of NASA imagery from Wikimedia Commons
Menu panorama: captured on the Mountain Village!! map with the Complementary Reimagined shader
Cape creation tool: ko-fi.com/s/ce84afe094

If any code or assets belong to you and you would like them removed, please open an issue. We aim to properly credit all contributors and respect original creators of their respective art.

License

The source code is publicly available to read, and contributions are welcome: you are free to fork the repository and open issues and pull requests to contribute. Beyond that, this software may not be copied, modified, or redistributed without explicit written permission from the copyright holders. By submitting a contribution, you agree that it becomes part of Saturn Client under these same terms. Third-party components keep their own licenses; see NOTICES.md.

Saturn Client is not an official Minecraft product. It is not approved by or associated with Mojang or Microsoft.

Made with ❤️ by the Saturn Client team