1.9.0-neo-beta-1 is a beta file of the Minecraft mod Spectrum for NeoForge, made for Minecraft 1.21.1. It was published on March 4, 2026 and is 85.6 MB in size. Pre-release builds can contain bugs — back up your world before installing. For the full description, screenshots and every other version, visit the Spectrum mod page.
How to install: Put the .jar into the mods folder (.minecraft/mods) and start Minecraft with the matching mod loader profile.
