Atlas

Keep your friends on the same mods. Atlas is a Windows companion app for Minecraft: Java Edition that keeps a modpack in sync between friends, alongside the launcher you already use (Prism Launcher, Modrinth App, CurseForge, the Minecraft Launcher).

Atlas isn't a launcher. Your launcher still installs and runs the game; Atlas keeps the mods and configs in your instances the same as your friends'.

How it works

1. Atlas finds the instances your launchers already have.
2. Share one with friends or a group.
3. They accept the invite and pick a launcher. It installs the game, and Atlas fills in the mods and configs.
4. When you change the pack and publish, everyone gets the update.

Features

• Required, optional or only me. Choose per file what friends get. Optional mods are theirs to take or leave.
• Safe updates. Atlas waits for the game to close, backs up what it replaces, and never touches your worlds or your own extras.
• Undo. Roll an instance back to any of its last three backups.
• Mods from Modrinth and CurseForge, downloaded from the source. Files on neither can be uploaded, with your permission.
• Friends and groups. Add friends by their Minecraft name or with a friend link, and see who's online.
• Works signed out. Sign in with Minecraft only for sharing.
• Plays well with Tandem. Same account and friends, so your group can play the world together too.

Download

Download from the releases page, or from KeplerSync. Atlas updates itself.

Building from source

You need Node.js, pnpm and Rust.

pnpm install
pnpm tauri dev     # run with hot reload
pnpm tauri build   # build an installer

Show your support

Please consider supporting the project by starring the repository, or by donating via Ko-fi!

Support

Ask for help or questions in the KeplerSync Discord, and report bugs in GitHub issues. For anything private, email support@keplersync.app.

License

The code is licensed under GPL-3.0.

The Atlas and KeplerSync names and logos (static/atlas-icon.svg, static/atlas-logo.svg, static/atlas-mark.svg, the favicons in static/ and the app icons in src-tauri/icons/) aren't covered by that license and may not be used without permission.

Not an official Minecraft product. Not approved by or associated with Mojang or Microsoft.