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SPECIFICTION
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OpenJar Launcher

github.com

Free plan WindowsmacOSLinux
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Spec score 8.4 #16 of 75 in Minecraft Launchers

What it is

OpenJar Launcher is a Minecraft launcher and modding toolkit for organizing instances, modpacks, mods, configurations, and launches. Each setup is kept in a separate on-disk folder with its own worlds, settings, mods, and metadata. Users can browse and install content from Modrinth, CurseForge, and GitHub, or import Modrinth .mrpack and CurseForge modpack ZIP files, Vanilla Minecraft, and Prism Launcher instances. Lockfile tracking supports version pinning, compatible update checks, and rollback snapshots before updating everything. Creator Studio builds layered modpacks and previews changes before applying them. Run reports and Fix My Instance offer likely causes and reversible recovery actions. Data stays local by default; network activity is for provider, authentication, update, and sync flows the user chooses. Friend Link is designed for small groups, but its first version has no hosted cloud relay or world-save replication. The free plan covers personal and non-commercial use; commercial use requires written permission. Targets include macOS, Linux, and Windows, with the most manual testing on macOS.

Spec sheet

Purpose
OpenJar is a Mac-first Minecraft launcher and modding toolkit for managing instances, modpacks, mods, configs, and launches.Read 11 Oct 2026 · github.com
Free plan
YesRead 22 Sep 2026 · github.com
Support
The README asks users who encounter Windows or Linux issues to open a GitHub issue with OS version, architecture, reproduction steps, and relevant errors or logs.Read 11 Oct 2026 · github.com
Automatic updates
YesRead 22 Sep 2026 · github.com
Built-in modpack catalog
YesRead 22 Sep 2026 · github.com
Creator Studio
Creator Studio builds layered modpacks and previews planned changes before applying them.Read 11 Oct 2026 · github.com
Credential security
Production builds store refresh tokens in OS secure storage, and the project says they do not intentionally fall back to plaintext token storage.Read 11 Oct 2026 · github.com
Friend Link limit
Friend Link is designed for small groups and has no hosted cloud relay or world-save replication in v1.Read 11 Oct 2026 · github.com
Instances
It keeps each Minecraft setup in its own normal on-disk folder with separate mods, configs, worlds, launch settings, and metadata.Read 11 Oct 2026 · github.com
Java runtime management
YesRead 22 Sep 2026 · github.com
License restriction
The source-available license permits personal and non-commercial use but prohibits redistribution or commercial use without written permission.Read 11 Oct 2026 · github.com
Local-first data
Instances, worlds, configs, and saves are not uploaded by default; network use is for provider, authentication, update, and sync flows the user chooses.Read 11 Oct 2026 · github.com
Maintenance
Lockfile tracking supports version pinning, compatible update checks, and rollback snapshots before Update All.Read 11 Oct 2026 · github.com
Modpack import
bothRead 22 Sep 2026 · github.com
Pack imports
It can import Modrinth .mrpack and CurseForge modpack ZIP archives, plus Vanilla Minecraft and Prism Launcher instances.Read 11 Oct 2026 · github.com
Platform support
Build targets include macOS Intel and Apple Silicon, Linux x64, Windows x64, and Windows ARM64; macOS receives the most manual testing.Read 11 Oct 2026 · github.com
Provider integrations
It supports browsing and installing content from Modrinth, CurseForge, and GitHub.Read 11 Oct 2026 · github.com
Separate instances
YesRead 22 Sep 2026 · github.com
Troubleshooting
Run reports and Fix My Instance surface likely causes, recent changes, and reversible recovery actions.Read 11 Oct 2026 · github.com

Plans and prices

OpenJar Launcher Free Personal and non-commercial use; commercial use requires written permission Read 11 Oct 2026 · github.com

Every OpenJar Launcher plan and price →

Strong points and limits

Strong points

  • Separate folders for each Minecraft setup
  • Imports several modpack and instance formats
  • Rollback snapshots before Update All
  • Local data is not uploaded by default
  • Builds for macOS, Linux, and Windows

Limits

  • Friend Link lacks hosted relay and save replication
  • Commercial use requires written permission
  • macOS receives the most manual testing

Who it suits

It suits Minecraft players who want distinct, locally stored setups and tools for importing or maintaining modpacks. Its license is limited to personal and non-commercial use unless written permission is obtained for commercial use.

Verdict

OpenJar combines instance management, pack imports, update tracking, and troubleshooting tools in a free launcher. Check the license terms and Friend Link limits if commercial use or shared-world hosting matters.

Where Specifiction places it

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