UltimMC is a free, open-source custom Minecraft launcher for managing separate game instances and using offline accounts while staying close to the original launcher. It is a fork of MultiMC and runs on Linux, macOS, and Windows. Windows downloads cover 32-bit and 64-bit systems. Linux users can use a 64-bit download, Debian or Ubuntu .deb packages, or an AUR package. The macOS build supports version 10.14 and newer. Setup allows a local account with a chosen username or an Ely.by account using email and password. The project says an MSA API key for Microsoft authentication is included and asks forks to replace or remove it. Builds come directly from GitHub Actions. Updating currently means replacing designated files and folders with newer downloads; a better updater is in development. The software has no warranty. Problems specific to UltimMC can be reported through its repository issue tracker.
Who it is for
UltimMC suits Minecraft players who want separate instances, offline-account options, and a launcher for Linux, macOS, or Windows. It also fits users comfortable with manual updates and repository-based support.
What is good
- Free and open source
- Manages multiple separate instances
- Supports offline accounts
- Runs on Linux, macOS, and Windows
- Offers several Linux package formats
What to know first
- Automatic updates are unavailable
- Updates require replacing files and folders
- Provided without warranty
- macOS requires version 10.14 or newer
Verdict
UltimMC provides a no-cost launcher with broad desktop support and separate-instance management. Manual updating and repository issue support are important parts of its current use.
UltimMC plans and pricing
All plansCompared on Minecraft launchers
- Separate instances
- Yes
- Automatic updates
- No
