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Tech riderRev. 12 Oct 2026

UltimMC

Ch 685.8of 74Minecraft Launchers
  1. 1Runs onLinux, Mac, Windows
  2. 2CostsFree plan
  3. 3Separate instancesYes
  4. 4Automatic updatesNo
4 lines stated Written from the maker's own pages: github.com
Visit site Alternatives
The UltimMC homepage

Overview

UltimMC is ranked #68 of 74 in Minecraft launchers on Specifiction. It runs on Linux, macOS, Windows. There is a free plan.

UltimMC plans and pricing

All plans
UltimMC Free No paid plans or usage limits stated github.com · 12 Oct 2026

Compared on Minecraft launchers

Separate instances
Yesgithub.com
Automatic updates
Nogithub.com

Facts

Purpose
UltimMC is a custom Minecraft launcher for managing multiple instances and using offline accounts while keeping as close as possible to the original.github.com · 12 Oct 2026
Project origin
The project is a fork of MultiMC.github.com · 12 Oct 2026
Windows support
Direct downloads are available for 32-bit and 64-bit Windows.github.com · 12 Oct 2026
Linux support
A 64-bit Linux download is available, along with a .deb package for Debian and Ubuntu and an AUR package.github.com · 12 Oct 2026
macOS support
A macOS download is available for macOS 10.14 and newer.github.com · 12 Oct 2026
Build source
The project says its available builds are taken directly from its GitHub Actions.github.com · 12 Oct 2026
Account options
The setup instructions describe adding a local account with a chosen username or adding an Ely.by account using an email and password.github.com · 12 Oct 2026
Microsoft authentication
The project says it includes an MSA API key for Microsoft authentication and asks forks to remove the key or set their own.github.com · 12 Oct 2026
Update process
Updating currently involves replacing replaceable files and folders with newer downloads; the project says a better update system is in the works.github.com · 12 Oct 2026
Warranty
The software is provided without any warranty.github.com · 12 Oct 2026
Support
Users can create a repository issue for problems specific to UltimMC; the README says not to contact the main MultiMC developers about problems with this launcher.github.com · 12 Oct 2026
Organization
The UltimMC GitHub organization describes itself as dedicated to developing UltimMC and related software.github.com · 12 Oct 2026

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Where it ranks on Specifiction

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Sources