Last updated 12 October 2026

Privacy Policy

Short version: Shulker keeps your data on your own computer. It has no analytics, no tracking and no Shulker servers that receive information about you.

What the launcher stores on your computer

The launcher keeps its files in a folder on your computer (~/.local/share/shulker on Linux, %APPDATA%\shulker on Windows):

Accounts: your Minecraft username and UUID, and for Microsoft accounts the sign-in tokens that keep you signed in. These tokens are stored in a file on your computer, so treat that folder as private.
Profiles and settings: your profiles, Minecraft versions, mod lists and launcher settings.
Game files: Minecraft, Java runtimes, mods, worlds, logs and the Shulker client mod's settings (config/shulker.json).

None of this is sent to the Shulker developers. You can delete it by removing accounts in the launcher or by deleting the folder.

Who the launcher talks to

To do its job, the launcher connects directly to these services. Each one handles data under its own privacy policy:

Microsoft, Xbox Live and Minecraft services (login.microsoftonline.com, xboxlive.com, minecraftservices.com): to sign you in, check that your account owns Minecraft: Java Edition and get your Minecraft profile. You sign in on Microsoft's own page; Shulker never sees your password. Microsoft Privacy Statement.
Mojang (mojang.com, minecraft.net): to download Minecraft game files.
Eclipse Adoptium (adoptium.net): to download the Java runtime Minecraft needs.
Fabric and Forge (fabricmc.net, minecraftforge.net): to install mod loaders.
Modrinth (modrinth.com): when you search for, install or update mods, including the performance pack.
mc-heads.net: to show account avatars, using your account's public UUID.

Discord

If Discord is running, Shulker tells the Discord app on your computer what you're doing, and Discord shows it on your profile. The launcher and the in-game client never show it at the same time: while the game shows its status, the launcher's stays off.

The launcher shares your Minecraft version and loader, the server address or "Singleplayer", and how long you've been playing.
The in-game client (Fabric 1.21.4 and 1.21.11) can also share the world name, dimension, game mode, the server's player count, whether you're paused or away, and your skin's head. To show the head, your Minecraft username is put in an image link to mc-heads.net, which Discord loads and shows to people who view your profile.

Shulker sends this only to the Discord app on your computer, and Discord shows it under its own policy. You can turn off each item (server address, world name, dimension and game mode, player count, skin head) in the Discord RPC mod's settings, hide the server address or turn the launcher's status off in Settings, or switch the feature off completely. Discord Privacy Policy.

The in-game client

The Shulker client mod runs inside Minecraft and saves its settings locally. It connects to Minecraft services (api.minecraftservices.com) only when you view or change your skin or cape from its skin screen, using the sign-in Minecraft already has. Apart from that and the local Discord connection above, it makes no network connections of its own.

This website

This site uses no cookies, no analytics and no third-party scripts or fonts. Like most websites, the server that hosts it may keep standard access logs (IP address, browser type, the page requested and the time) for security and to keep the site running. These logs are not used to track you and are deleted after a limited period.

Children

Shulker doesn't collect personal information from anyone, including children. Sign-in for younger players is subject to Microsoft's family and child-account settings.

Changes

If what Shulker does with data changes, we will update this policy and the date at the top.

Contact

Privacy questions: safwat@arioron.com.