Quantum Client

A sleek, lightweight Minecraft utility client for Fabric 1.21.9 – 1.21.11.

Quantum replaces the default Minecraft main menu with a fully custom animated dark UI and brings a suite of quality-of-life modules accessible anywhere in-game through a single keybind. It ships with a custom high-quality font, a themeable accent-color system, a drag-and-drop HUD editor, and a pixel-perfect crosshair designer.

Internally the project is still named zenithclient (package, class names, and config folder), but everything you see in-game is branded Quantum Client.

Features

Main Menu

• Fully custom animated main menu that replaces the vanilla panorama.
• Interactive parallax starfield background that reacts to your cursor, with a theme-tinted glow.
• Animated "QUANTUM" wordmark, smooth frame-rate-independent transitions, and a decorative orbit/altitude widget that tracks the hovered menu item.
• Smooth hover slides and color cross-fades on every menu row.
• The interactive background carries over to the vanilla menu screens too (world select, options, multiplayer), replacing their panorama.

Themes

• 16 built-in accent themes: Lava, Arctic, Jade, Neon, Gold, Mint, Void, Ember, Frost, Rose, Ocean, Sunset, Matrix, Cobalt, Sakura, and Ash.
• Every HUD element, menu accent, and toggle recolors to the active theme instantly.

In-Game Overlay (toggle with Right Shift)

A draggable settings panel opens over the game, main menu, or any screen. Right-click a module to open its settings sub-panel.

Movement

• AutoSprint - sprints automatically; options for omni-directional sprint and sprinting in water.

Visual

• Fullbright - removes all darkness (works in every biome and dimension) with an adjustable brightness level and optional night-vision boost.
• Zoom - hold a key to smoothly zoom in like a spyglass. Configurable magnification, smooth easing, scroll-to-adjust, and a rebindable zoom key.
• Crosshair - draw your own 15×15 crosshair in a built-in pixel editor. Choose theme-accent color, or leave it off for the true vanilla color-inversion look that adapts to whatever's behind it. Adjustable pixel scale.
• Time Changer - override the visual time of day with a slider across the full Minecraft day (client-side only, doesn't touch the server).
• Particles - a themed drifting particle overlay shown behind the settings screen, with density, speed, and theme-color options.
• Custom Font - toggle the Quantum font on/off globally, with a text-shadow option.

HUD

• Coordinates - X Y Z position, with optional facing direction, biome name, background, scale, and screen position.
• FPS Display - live frames-per-second counter, color-coded by performance, with an optional ms readout.
• Armor HUD - equipped armor next to the hotbar with durability, theme-colored borders, and a low-durability warning threshold.
• Ping Display - current server ping in milliseconds, color-coded by latency.
• Keystrokes - live WASD / mouse / space key display with adjustable opacity and scale.

HUD Editor

• A dedicated drag-and-drop editor to freely reposition every enabled HUD element.
• Elements that share a default corner auto-stack so they never overlap.
• Double-click to reset an element, or reset everything at once. A grey safe-zone border shows the screen bounds.

Settings & Config

• Every module state and setting saves automatically to config files under config/zenithclient/.
• Per-module settings panels with animated toggles, sliders, dropdowns, keybind capture, and buttons.
• Accessible from anywhere - main menu, singleplayer, or multiplayer - via Right Shift.

Installation

1. Install Fabric Loader for your Minecraft version (1.21.9–1.21.11).
2. Drop Fabric API into your mods folder.
3. Drop the Quantum Client .jar into your mods folder.
4. Launch the game - the custom main menu appears automatically. Press Right Shift in-game to open settings.

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Quantum is in early alpha - more modules and features are on the way.