Overview
This page explains what data the Cipher Client software sends while you play, and what data may be processed when you visit cipherclient.net. The website is designed to operate without user registration or a database.
Cipher Client usage report (telemetry)
Cipher Client sends a small usage report so the team can see how many people use which version. The report is on by default and can be switched off at any time under Settings → Telemetry → Report Usage in the Cipher Client menu.
What is sent: two messages per game session, one when you start and one when you close the game, to the Cipher Client server at api.cipherclient.net. Each message contains your Minecraft username, the Cipher Client version and Minecraft version, a random session ID (so start and stop can be paired) and a timestamp.
Account check: when the game starts, Cipher Client performs the standard Minecraft session check with Mojang, the same one used when you join a server. The Cipher Client server then asks Mojang whether that check happened. This proves a session comes from a real account and stops people from faking reports. Your login token is only ever sent to Mojang, never to Cipher Client.
What is never sent: your IP address as part of the report, which servers you play on, your UUID, chat, coordinates or anything else.
Storage: session data is kept for at most 90 days. The server logs only shortened (anonymised) IP addresses.
Update check: since version 1.0.1, Cipher Client also downloads the public file cipherclient.net/version.json once per launch to see whether a newer version exists for your Minecraft version. This request contains no account or game data; like any web request, it reaches the web server with your IP address and a user agent that names the Cipher Client version. The check is separate from the usage report and can be switched off under Settings → Updates & Community → Check for Updates.
Local client features
Crash Guard, configs, profiles, favourites, keybinds, friends lists, notebooks and other module data are processed and stored locally on your own computer. Chat commands that start with a dot are handled by your client and are not sent to the server you play on. Modules that interact with a Minecraft server, such as chat or command-based modules, send data to that server like any other Minecraft action; that server's own privacy terms apply.
A few optional modules contact other services, and only when you use them: Cape Manager reads and switches your capes through Mojang's official Minecraft services API; DiscordPresence shares your game status with the Discord app on your computer; and the SeedCracker module downloads the public SeedcrackerX community seed list from Google Sheets the first time you enable it. Submitting cracked seeds to that community database is off by default. The .uuid chat command (since 1.2.0) looks up the player names and UUIDs you ask for with Mojang's public profile API, and .server plugins expanded sends the server one tab-completion request, the same as pressing Tab.
The Privacy modules added in version 1.1.0 work locally. If you allow Streamer Mode to start by itself, it checks on your own computer whether OBS or Streamlabs is running; nothing about this is sent anywhere. Telemetry Blocker, on by default, stops the vanilla telemetry that Minecraft itself sends to Mojang. Cipher Client's own usage report is controlled separately under Settings → Telemetry.
Website accounts and personal profiles
The website does not offer account registration and does not create personal user profiles. It does not ask visitors to submit personal information through forms.
Technical server logs
The web server or hosting provider may process necessary technical logs, such as IP addresses, request times, requested pages and browser information. These logs may be used for security, abuse prevention, troubleshooting and service reliability. Retention and processing can depend on the hosting provider and server configuration.
External services and downloads
Links to Discord lead to an external service. Discord processes data under its own privacy terms and policies. Cipher Client does not control how external websites or services handle your information.
When an official Cipher Client or standalone mod download begins, the website sends a private operational notification to the Cipher Client staff Discord channel. This notification contains the selected product, its version, the Minecraft version, Fabric loader, filename and time. The website also maintains anonymous aggregate counters per mod, version and calendar day for daily download summaries. These counters cannot be linked to individual visitors. Cipher Client does not include or store the visitor's IP address, Discord account, cookies, referrer or browser information for this feature.
Contact
Questions about this privacy information can currently be directed to the staff team through the official Cipher Client Discord server.
Open the official Discord