Frequently asked questions

What is Blue Client?

Blue Client is a Minecraft 1.8.9 client focused on 1.8 PvP. It adds HUD customization, quality-of-life mods, and cosmetics on top of a 1.8 base.

Unlike most custom clients (Lunar, Badlion), Blue Client is not a Java mod loaded on top of the Minecraft jar. The underlying engine is written in Rust from scratch.

Why 1.8.9 only?

1.8 combat is the PvP community standard. We're focusing on that. Other versions are not on the roadmap right now.

Is it free?

The beta is free for invited testers. Pricing for the public release hasn't been decided. If that changes, it'll be announced in the Discord first.

Is this a cheat client / ghost client?

No. Blue Client has no combat assistance, aim bots, reach hacks, or similar features. It's a cosmetic / HUD / QoL client in the same category as Lunar or Badlion.

There is currently a known compatibility issue with Grim AC that causes false positives during PvP block-hit. This is a bug we're tracking, not a feature. See the known issues on the home page.

How do I get beta access?

Join the Discord and follow the access instructions there. Invites are handled manually while the beta is small.

Can I share the build with friends?

No. Beta builds are invite-only and not for redistribution. If a friend is interested, send them to the Discord.

Can my account get banned for using this?

Blue Client doesn't include any features that break Minecraft's EULA or a typical server's rules. We treat it like any cosmetic / HUD client.

That said, servers decide their own rules. If a server bans all third-party clients, or if the ongoing Grim AC false-positive affects you, that's a risk you take by using a beta build. We don't take responsibility for bans.

Why Rust? Is the .exe going to be flagged as a virus?

Rust is the language the engine is written in. The build is a normal compiled binary — no scripts, no obfuscation, no DLL injection.

Because we're not a large signed publisher yet, Windows SmartScreen may show a warning on first run (it does this for most small-dev binaries). If that makes you uncomfortable, don't install.

Does it run on macOS / Linux?

The engine targets Windows, macOS, and Linux. During beta we're prioritizing Windows because that's where most testers are. Other platforms are built but tested less often.

System requirements?

Lower than Java clients in most cases. A GPU that supports Vulkan / Metal / DX12 (any laptop from the last ~8 years) and roughly 1 GB of RAM available. No exact numbers yet.

Can I use Forge / OptiFine mods?

No. Blue Client isn't a Java mod, so Java-ecosystem mods (Forge, Fabric, OptiFine) don't apply. Features from those ecosystems will be built natively as first-party mods, or not at all.

Does it support single-player / LAN?

No. There's no world generation and no integrated server. Blue Client is multiplayer-only. This is a scope decision, not a bug.

Does it support Microsoft / Mojang accounts?

Microsoft accounts only (standard OAuth Device Code Flow). Mojang accounts have been migrated by Microsoft since 2023.

Which servers does it work on?

Any vanilla-compatible 1.8 (protocol 47) server. ViaVersion-backed servers work in principle but are not a primary test target.

Servers running Grim AC with strict thresholds may show Simulation false positives — see the known issues.

Is it open source?

No. Blue Client is closed source.

Can I request a mod / feature?

Yes — the Discord has a channel for feature requests. Priority goes to things with broad PvP utility first.

I found a bug. Where do I report it?

The #bugs (or equivalent) channel in the Discord. Include: what you were doing, what happened, the server you were on, and the build version. Screenshots / video help a lot.

When will 1.0 / public release happen?

No ETA. We'd rather ship when it's actually stable than promise a date.

Is this affiliated with Mojang or Microsoft?

No. Blue Client is an independent project. Minecraft is a trademark of Mojang Studios.