Version 1.6.11· Windows & Linux

Minecraft,
without the launcher bloat.

A fast, open-source launcher built with React and Electron. Featuring in-engine telemetry via Onyx Probe, zero-overhead Ghost Mode, native Modrinth browsing, and safe world backups.

Download for WindowsGet AppImage (Linux)

MIT licensed · SHA-256 verified · 54 test suites · 100% Free & Open Source

ONYX LAUNCHER1.6.11
Onyx Launcher showing the modern control center dashboard
LOADERSFabric · NeoForge · ForgeQuilt · Vanilla
✓
TELEMETRYOnyx Probe Ready
5game loaders
0 MBRAM in Ghost Mode
54automated test suites
MITopen-source license

BUILT FOR REAL PERFORMANCE

Advanced diagnostics. Zero runtime overhead.

Onyx is engineered to give you complete visibility into game performance and mod stability without slowing down your system.

01

Onyx Probe: In-Engine FPS & 1% Lows

A built-in Java agent hooks LWJGL/GLFW directly at bytecode level. Collects nanosecond-accurate frame times, average FPS, and stutters without external overlays or tools on macOS, Windows, and Linux.

02

Ghost Mode: Zero Gaming Overhead

When Minecraft launches, Onyx releases its window, renderer, and GPU process from RAM. Zero unnecessary memory or CPU cycles consumed while you play.

03

Real-time Downloads with Speed & ETA

Smooth download progress, moving-average transfer rate in MB/s, and accurate completion estimates for large modpacks, assets, and runtimes.

04

Modrinth Catalog & 5 Loaders

Browse, install, and update modpacks and mods with one click. Native isolated support for Fabric, NeoForge, Forge, Quilt, and Vanilla.

05

Flight Recorder & Crash Diagnostics

Automatic log analysis, memory tracking, GC pause detection, and Crash Bisect to identify conflicting mods across controlled launches.

06

World Guard & Safe Rollbacks

Automatic safety snapshots before dangerous operations, OS trash integration, and transactional mod profile rollbacks to keep saves safe.

A CLEAN INTERFACE

Everything for your game. Nothing in the way.

Compact, fast, and responsive: instances, modpacks, performance curves, and instance recovery are always one click away.

Onyx Launcher instance management screen
PERFORMANCE & TELEMETRYIn-engine FPS curves, 1% lows, and Flight Recorder metrics.
Onyx Launcher Control Center dashboard
CONTROL CENTERQuick launch, active profiles, and session analytics.
Onyx Launcher Modrinth discovery catalog
DISCOVERBrowse and install Modrinth modpacks and mods directly.
Onyx Launcher content library
LIBRARYSeparate tabs for Fabric, NeoForge, Quilt, and Forge.
Onyx Launcher settings screen
SETTINGSStreamlined configuration without marketing clutter.

DIAGNOSTICS, NOT GUESSWORK

When a modpack breaks, find the exact cause.

Onyx continuously monitors JVM health and presentation timing. Identify memory leaks, micro-stutters, and conflicting mod IDs in seconds.

  • ↳ In-engine FPS & 1% low capture via Onyx Probe JVM agent
  • ↳ Crash Bisect across controlled binary search launches
  • ↳ Flight Recorder for CPU load, memory RSS, and GC pause spikes
  • ↳ Redacted support bundles for safe troubleshooting
ONYX / PREFLIGHTPASS
instance       Better Adventures
minecraft      1.21.1
loader         Fabric 0.16.10
java           Temurin 21.0.7
probe          Onyx Probe (GLFW hooked)
memory         6144 MB
world guard    snapshot ready
mod scan       148 checked

✓ no blocking conflicts found
→ ready to launch (Ghost Mode armed)

BEFORE YOU DOWNLOAD

Clear answers, no marketing fluff.

Platform support, Java, licensing, integrity, and storage explained upfront.

How does Onyx record FPS and frame times?

Onyx bundles an in-house lightweight Java agent called Onyx Probe. When FPS capture is enabled, it instruments GLFW and LWJGL frame swaps at runtime, measuring nanosecond-precise frame intervals without requiring external software like PresentMon or MangoHud.

What is Ghost Mode?

When Minecraft launches, Ghost Mode automatically unloads the Onyx window, WebContents, and GPU processes from system memory. This ensures 100% of your RAM and GPU headroom remains available for Minecraft shaders and heavy modpacks.

Do I need to install Java manually?

No. Onyx automatically detects, downloads, and isolates the appropriate Eclipse Temurin runtime (Java 8, 17, or 21) required for your specific Minecraft version and mod loader.

How do I run the Linux AppImage?

Download the AppImage, make it executable, and run it. Alternatively, download the .deb or .rpm package for your Linux distribution.

chmod +x Onyx-Launcher-1.6.11-x86_64.AppImage && ./Onyx-Launcher-1.6.11-x86_64.AppImage
Does Onyx require an official Minecraft account?

You can sign in securely with your Microsoft account via OAuth Device Flow (Onyx never handles your password). Offline mode with custom skin support is also available for offline play.

Can I verify the binary downloads?

Yes. Every GitHub Release publishes SHA-256 checksums alongside every binary, and all builds are compiled transparently through public GitHub Actions CI.

DOWNLOAD ONYX 1.6.11

Pick your platform. Play without bloat.

Windows builds are currently unsigned, so SmartScreen may show a warning. Verify the published SHA-256 checksum before running.