# PolyMC/PolyMC

A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)

Repository: https://github.com/PolyMC/PolyMC
Canonical: https://ross.abutalabs.com/products/polymc
Homepage: https://polymc.org/
Language: C++
License: GPL-3.0
License Family: copyleft
Topics: minecraft, minecraft-launcher, polymc, cpp, linux, fabricmc, forge, modrinth, qt, qt6, quiltmc
Last push: 2026-08-25T21:44:30+00:00

## Health v2 (maintenance only)
Score: 87/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 99, release rhythm 63, longevity 100
- inputs: {"age_days": 1720, "days_push": 8, "days_rel": 34, "gap_med": 531, "n_releases_24m": 2}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2074, forks 297 (observed 2026-08-28T04:06:10.711431+00:00)

## What it is
PolyMC is an open-source custom launcher for Minecraft, forked from MultiMC, that lets users create and manage multiple isolated Minecraft instances with separate mods, resource packs, and settings. Built with Qt, it supports installing modloaders (Forge, Fabric, Quilt, LiteLoader) and downloading mods and modpacks from Modrinth, CurseForge, Technic, and FTB.

## Use cases
- manage multiple minecraft installations with separate mods and settings
- install forge or fabric modloaders easily
- download and update mods from modrinth and curseforge
- install modpacks without manual setup
- keep old minecraft worlds safe from version mismatches
- kill frozen minecraft and view game logs quickly
- run a lightweight open-source minecraft launcher on linux

## When to choose
- you play multiple Minecraft versions or modpacks and need isolated instances
- you want a lightweight, free, redistributable launcher without an embedded web browser
- you need one-click mod and modpack installation from Modrinth or CurseForge

## When to avoid
- you only ever play one vanilla Minecraft version and the official launcher suffices
- you need features from launchers with built-in social or marketplace features
- you require a launcher officially endorsed by MultiMC

## Facets
- artifact type: application
- maturity: active
- function: gui, developer-tools
- domain: gaming-tools, cross-platform
- platform: windows, cpp
- tags: minecraft-launcher, mod-management, qt6, multi-instance, modrinth, curseforge, forge, fabric, quilt, multimc-fork, linux, macos, desktop

## Member repositories
- PolyMC/PolyMC (main) score 87

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:10.711431+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-30T02:56:20.587880+00:00, confidence not recorded.
  - readme: https://github.com/PolyMC/PolyMC (fetched 2026-08-28T04:06:10.711431+00:00, sha bb11674c8cad)
  - homepage: https://polymc.org/ (fetched 2026-08-29T10:36:32.784768+00:00, sha c42520e6d523)
  - site_page: https://polymc.org/about (fetched 2026-08-29T10:36:32.787872+00:00, sha d1ec7d677336)
- Data as of 2026-08-30T08:39:29.467469+00:00.