Privacy
What BlueClient sends, what stays on your PC, and how to switch each thing off. This is the whole of it — there is no longer version anywhere else. Last changed 16 September 2026.
The short version
BlueClient is a launcher and a set of additions to Minecraft. It has no account of its own — you sign in with Microsoft, on your PC, and the launcher never sees your password. Four things can leave your PC, each named below; one is on by default and it switches off in one press. Nothing is sold, shown to advertisers, or handed to anyone else.
1. The player count — on by default
So the number of people playing is real, the launcher sends a small ping every five minutes while it is open, once when a game starts and once when it closes: an install id (a code made from your PC’s own id — one way, so it cannot be turned back into anything), the launcher version, which operating system, whether a game is open, and — on a launch — the Minecraft version and which BlueClient features were switched on. Never your name, your account, your servers or your worlds. Our server keeps a scrambled version of the connection’s address (a salted hash) and the country it came from, never the address itself, and adds the ping to daily counts. Switch it off: Settings › About › Count me as a player.
2. Crash reports — off by default
If you switch it on, a game that crashes sends nine things and nothing else: the launcher, mod, Minecraft and loader versions, the kind of crash, the one-line reason, the suspected mod and its version, and the first 200 characters of the error. Never the log, the crash report itself, a file path, a username, an account or the install id. Switch it on or off: Settings › General › Send crash reports.
3. Friends and capes — only if you use them
Friends live in the game’s own menu and work only on a Microsoft account. When you open the list, the game proves to our server that the account is yours the same way it proves it to any server (Mojang’s own signed certificate) and, from then on while you play, sends your Minecraft uuid and name, whether you are online, and where you are — the server address, or the name of your singleplayer world — refreshed every three minutes, so a friend can see it and join you. Friend requests, and messages between friends, go through the same server; a message is kept for at most three days, then deleted whether or not it was read. The cape you wear is a word (“signature”, or your colours) that other BlueClient players are shown beside your uuid. Your play record — hours, level and milestones — never leaves your PC. Not using Friends means none of this is ever sent. An offline account cannot use Friends at all.
4. Playing together — only when you open a world
Opening your singleplayer world to a friend tells our server the world is open and tries to open one port on your router (UPnP) so your friend connects to you directly. If that cannot be done, the game’s traffic goes through BlueClient’s relay, which passes it on and stores none of it. Close the world and everything is forgotten.
Things the launcher asks other people for
Mojang and Microsoft — signing in, your skin, and the game’s files, exactly as the official launcher does. Modrinth — mods and resource packs you add, and the Faithful textures if you switch them on. GitHub — launcher updates. The servers on your list — the same ping the game’s Multiplayer screen sends, and their logo from their own address. Browse skins — typing a player’s name asks Mojang and laby.net for that player’s skins; the skins you are shown are offered to BlueClient’s own skin index as picture hashes only, with nothing about you attached. Wearing a skin uploads it to your Minecraft account through Mojang, because it is then your skin everywhere.
What stays on your PC
Your accounts (the Microsoft token, encrypted by Windows), every setting, your profiles and mods, your play record — hours, streak, level, milestones, capes earned — your waypoints, and your clips. Uninstalling removes the launcher; the folder %APPDATA%\BlueClient holds the rest and is yours to delete.
This website
It sets no cookies, runs no analytics and loads nothing from anyone else — the font is served from here. The Download button goes to GitHub, where the releases are kept; a download counted for a partner (blueclient.net/partner) is a number against that partner’s name and nothing about you.
Under 13
BlueClient does not ask your age. A Minecraft account for someone under 13 is managed by a parent’s Microsoft family, and that is the account the launcher signs into. Nothing above is tied to a name unless you use Friends, and a parent who wants a child’s Friends record — the uuid, its requests and any messages — removed can write to the address below and it will be.
Ask, or have it removed
To ask what is held under your Minecraft uuid, or to have your Friends record deleted, write to hello@blueclient.net. The player count holds nothing that can be traced to you, so there is nothing there to remove. BlueClient is made by one person; what is held sits with Cloudflare, which hosts it.