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Introduction to Prism Launcher

Prism Launcher is a custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once. This is a fork of the MultiMC Launcher and is not endorsed by it.
Prism Launcher is free and open-source software licensed under GPL-3.0-only, ensuring transparency and community-driven development.

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What is Prism Launcher?

Prism Launcher provides a flexible, powerful interface for managing your Minecraft instances. Each instance is a separate, isolated installation of Minecraft with its own:
  • Game version
  • Mod loaders (Forge, Fabric, Quilt, NeoForge)
  • Resource packs and shader packs
  • Configuration files
  • Save data
  • Screenshots and logs
This separation means you can maintain different modded setups, vanilla versions, or modpacks simultaneously without conflicts.

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Key Features

Multiple Instances

Create and manage unlimited Minecraft installations, each with its own configuration, mods, and game version.

Mod Platform Integration

Direct integration with CurseForge and Modrinth for easy mod downloading and modpack installation.

Java Management

Built-in Java downloader and version manager to ensure you have the right Java version for each Minecraft release.

Account Management

Support for multiple Microsoft accounts with secure authentication through Microsoft Identity Platform.

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Advanced Features

  • Mod Loader Support: First-class support for Forge, Fabric, Quilt, and NeoForge
  • Resource Management: Easy installation and management of resource packs, shader packs, and data packs
  • Export/Import: Package and share your instances as .mrpack files
  • Screenshot Management: Built-in screenshot viewer and organizer
  • Log Viewer: Detailed game logs with syntax highlighting for debugging
  • Custom Commands: Run pre-launch and post-exit commands
  • Memory Management: Per-instance memory allocation settings
  • Java Arguments: Customize JVM arguments for optimal performance

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Why Use Prism Launcher?

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Compared to the Official Minecraft Launcher

Better Organization

Unlike the official launcher’s flat profile system, Prism Launcher provides true instance isolation with organized folders.

Modding Made Easy

No manual file copying - install mods and modpacks with a few clicks through integrated platforms.

Performance Control

Fine-tune memory allocation and JVM arguments per instance for optimal performance.

Open Source

Fully transparent, community-driven development with no telemetry or data collection.

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Perfect For

  • Modpack Players: Test and play multiple modpacks without conflicts
  • Mod Developers: Maintain separate testing environments for different mod loaders
  • Server Administrators: Match your local setup to different server configurations
  • Casual Players: Switch between vanilla versions and modded setups effortlessly
  • Content Creators: Manage different recording setups with optimized settings

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Technical Highlights

Prism Launcher is built with modern technologies: 
// Built with C++20 and Qt 6
set(CMAKE_CXX_STANDARD 20)
find_package(Qt6 6.4 REQUIRED COMPONENTS 
    Core Widgets Concurrent Network Test Xml NetworkAuth OpenGL)
Current Version: 11.0.0 (as defined in CMakeLists.txt:176-178)

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Cross-Platform Support

Prism Launcher runs on:
  • Windows (7 and later)
  • Linux (all major distributions)
  • macOS (Intel and Apple Silicon)
With native packaging available through:
  • Flatpak
  • AppImage
  • Snap
  • Homebrew (macOS)
  • Distribution repositories (Arch AUR, Fedora, Debian, etc.)

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Community & Support

Prism Launcher has a vibrant, helpful community:
  • Discord: Join thousands of users and get real-time help
  • Matrix Space: Open-source alternative to Discord
  • Reddit: r/PrismLauncher for discussions and news
  • GitHub: Report issues, request features, and contribute
Prism Launcher is not affiliated with Mojang Studios or Microsoft. It is an independent, community-driven project.

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Getting Started

Ready to get started? Follow these steps:
1

Install Prism Launcher

Download the appropriate installer for your operating system from the official website.
2

Add Your Account

Sign in with your Microsoft account to access Minecraft.
3

Create an Instance

Set up your first Minecraft instance with your preferred version and mod loader.
4

Launch and Play

Start the game and enjoy your customized Minecraft experience!

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License

All launcher code is available under the GPL-3.0-only license, ensuring it remains free and open-source. The logo and related assets are under the CC BY-SA 4.0 license.
When building from source, you must either use your own API keys or set them to empty strings for Microsoft authentication and CurseForge integration (see CMakeLists.txt:254-260).
Next Steps: Check out the Installation Guide to get Prism Launcher set up on your system, or jump to the Quick Start Guide to create your first instance.