- Home
- Minecraft Launchers
- OpenJar Launcher
OpenJar Launcher
What it is
OpenJar Launcher is a Mac-first Minecraft launcher and modding toolkit for managing instances, modpacks, mods, configurations, and launches. Each setup stays in its own on-disk folder, keeping its mods, configs, worlds, launch settings, and metadata separate. Users can browse and install content from Modrinth, CurseForge, and GitHub, or import Modrinth .mrpack and CurseForge ZIP archives, Vanilla Minecraft, and Prism Launcher instances. Lockfile tracking supports version pinning, compatible update checks, and rollback snapshots before Update All. Creator Studio builds layered modpacks and previews proposed changes before applying them. Run reports and Fix My Instance surface likely causes and reversible recovery actions. Friend Link is designed for small groups, but its first version has no hosted cloud relay or world-save replication. Instances, worlds, configs, and saves are not uploaded by default. The launcher is free for personal and non-commercial use; commercial use requires written permission.
For and against
For
- Separate folders keep instance settings and worlds apart.
- Supports content from Modrinth, CurseForge, and GitHub.
- Imports modpacks and existing Vanilla or Prism instances.
- Lockfiles support pinning, update checks, and rollback snapshots.
- Production builds store refresh tokens in OS secure storage.
Against
- Friend Link has no hosted cloud relay in version one.
- Friend Link does not replicate world saves.
- Commercial use requires written permission.
- macOS receives the most manual testing.
The verdict
OpenJar combines instance management, content imports, update controls, and troubleshooting tools while keeping data local by default. Note the Friend Link limits and the license restriction if you need group hosting or commercial use.
Who it suits
It suits Minecraft players who want separate local instances, modpack imports, and tools for managing updates. The license permits personal and non-commercial use; commercial use requires written permission.
Plans and prices
OpenJar Launcher
Personal and non-commercial use; commercial use requires written permission
Read 11 Oct 2026 · github.com
On the record
- Automatic updates
- Yesgithub.com · read 22 Sep 2026
- Built-in modpack catalog
- Yesgithub.com · read 22 Sep 2026
- Creator Studio
- Creator Studio builds layered modpacks and previews planned changes before applying them.github.com · read 11 Oct 2026
- 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.github.com · read 11 Oct 2026
- Friend Link limit
- Friend Link is designed for small groups and has no hosted cloud relay or world-save replication in v1.github.com · read 11 Oct 2026
- Instances
- It keeps each Minecraft setup in its own normal on-disk folder with separate mods, configs, worlds, launch settings, and metadata.github.com · read 11 Oct 2026
- Java runtime management
- Yesgithub.com · read 22 Sep 2026
- License restriction
- The source-available license permits personal and non-commercial use but prohibits redistribution or commercial use without written permission.github.com · read 11 Oct 2026
- 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.github.com · read 11 Oct 2026
- Maintenance
- Lockfile tracking supports version pinning, compatible update checks, and rollback snapshots before Update All.github.com · read 11 Oct 2026
- Modpack import
- bothgithub.com · read 22 Sep 2026
- Pack imports
- It can import Modrinth .mrpack and CurseForge modpack ZIP archives, plus Vanilla Minecraft and Prism Launcher instances.github.com · read 11 Oct 2026
- Platform support
- Build targets include macOS Intel and Apple Silicon, Linux x64, Windows x64, and Windows ARM64; macOS receives the most manual testing.github.com · read 11 Oct 2026
- Provider integrations
- It supports browsing and installing content from Modrinth, CurseForge, and GitHub.github.com · read 11 Oct 2026
- Purpose
- OpenJar is a Mac-first Minecraft launcher and modding toolkit for managing instances, modpacks, mods, configs, and launches.github.com · read 11 Oct 2026
- Separate instances
- Yesgithub.com · read 22 Sep 2026
- 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.github.com · read 11 Oct 2026
- Troubleshooting
- Run reports and Fix My Instance surface likely causes, recent changes, and reversible recovery actions.github.com · read 11 Oct 2026
