Prism Launcher (1.21.5, 1.20.1) – Lightweight Launcher with Mod Support

Prism Launcher is a free, open-source Minecraft launcher designed for users who need power, flexibility, and stability. Forked from the popular MultiMC project, Prism allows you to manage multiple Minecraft accounts and instances, each fully customizable with separate mods, saves, resource packs, and configuration files.

While it retains the core functionality of MultiMC, Prism Launcher expands on it with a focus on user freedom, modern design, and the addition of new, useful features. It aims to provide a smoother and more predictable experience for players and modders alike. Note: Prism is an independent project and is not officially affiliated with or endorsed by MultiMC.

Key Features

• Multi-instance management: Run and organize multiple Minecraft environments, each isolated to avoid mod conflicts.

• Built-in mod support: Quickly install and manage mod loaders such as Fabric, Forge, and Quilt from within the launcher.

• Java runtime control: Fine-tune Java settings, memory allocation, and launch arguments per instance.

• World and resource pack management: Access and organize your worlds, resource packs, and screenshots from one interface.

• Crash handling: Terminate unresponsive Minecraft processes directly from the launcher.

• Detailed logging: View logs, console output, and mod load errors for easy debugging.

• Mod installation and updates: Add or update mods right inside the launcher—no need to drag files manually.

• Open-source and community-driven: Built transparently with active development and community contributions.

Screenshots:

If you’re looking for a lightweight, modern, and customizable Minecraft launcher that builds on the strengths of MultiMC, Prism Launcher is a powerful alternative worth trying.

Requires:

Java

Java Runtime Environment