CustomCross

The crosshair is drawn in four shapes (Classic Cross, Dot, Circle and Square), and each one can be tuned with sliders for length, gap, arm thickness and opacity. A full RGB color picker with brightness and saturation controls sets the color, and the four lines can optionally take separate colors. Players who want a precise aiming point, such as a minimal dot or a scope circle, can build one from these settings or start from a preset.

The mod also changes the crosshair according to what the player is aiming at. Smart target detection recolors it when aiming at mobs, players or blocks, and the colors for each target type are configurable. A rainbow mode with adjustable speed and a pulsing effect, between 15% and 100%, add motion, and transitions between target colors are smoothed with easing. The vanilla crosshair can be hidden while CustomCross is active.

Beyond shapes, a built-in library holds more than 20 presets, including a PvP dot, a scope circle and an animated cat GIF, plus 16 semi-transparent PNG textures such as a heart that work without setup. Custom GIF and PNG crosshairs can also be made with the pixel editor. The mod is client-side only, so the server and other players do not need it. It is released under the MIT License and is open source, with the source code and issue tracker public. It is published for Fabric, for game versions 1.21.4 – 1.21.5.