OpenJar Launcher
OpenJar Launcher is a free, Mac-first Minecraft launcher and modding toolkit for organizing instances, modpacks, mods, configs, and launches.
What OpenJar Launcher is
OpenJar Launcher is a free, Mac-first Minecraft launcher and modding toolkit for organizing instances, modpacks, mods, configs, and launches. Each instance keeps its own mods, configs, worlds, launch settings, and metadata in a separate on-disk folder. Users can browse and install content from Modrinth, CurseForge, and GitHub, or import Modrinth .mrpack and CurseForge ZIP modpacks, Vanilla Minecraft, and Prism Launcher instances.
Lockfile tracking supports version pinning, compatible update checks, and rollback snapshots before Update All. Creator Studio assembles layered modpacks and previews planned changes; run reports and Fix My Instance offer likely causes and reversible recovery actions. Friend Link is aimed at small groups, but version one has no hosted cloud relay or world-save replication. Instances and saves stay local by default. Build targets cover macOS Intel and Apple Silicon, Linux x64, Windows x64, and Windows ARM64, with the most manual testing on macOS. The license permits personal and non-commercial use; commercial use requires written permission.
Good
- Keeps instance files in separate folders.
- Imports Modrinth and CurseForge modpacks.
- Supports version pinning and rollback snapshots.
- Offers reports and reversible recovery actions.
Watch out
- Friend Link has no hosted cloud relay.
- Friend Link does not replicate world saves.
- Commercial use requires written permission.
- macOS receives the most manual testing.
Who it suits
OpenJar Launcher suits Minecraft players who want separate instances, modpack imports, and tools for updating or troubleshooting setups. It also fits users comfortable with a Mac-first project or with the listed Windows and Linux build targets.
Verdict
OpenJar Launcher combines instance management, content imports, and update controls. Check the Friend Link limits and the non-commercial license terms if those matter to your setup.
Plans and prices
From OpenJar Launcher's own pricing page, checked 11 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| OpenJar Launcher | Free | Personal and non-commercial use; commercial use requires written permission |
The facts
Each one read from OpenJar Launcher's own pages, with the date it was checked.
What it does
- Automatic updates
- Yeschecked 22 Sep 2026
- Built-in modpack catalog
- Yeschecked 22 Sep 2026
- Creator Studio
- Creator Studio builds layered modpacks and previews planned changes before applying them.checked 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.checked 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.checked 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.checked 11 Oct 2026
- Java runtime management
- Yeschecked 22 Sep 2026
- License restriction
- The source-available license permits personal and non-commercial use but prohibits redistribution or commercial use without written permission.checked 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.checked 11 Oct 2026
- Maintenance
- Lockfile tracking supports version pinning, compatible update checks, and rollback snapshots before Update All.checked 11 Oct 2026
- Modpack import
- bothchecked 22 Sep 2026
- Pack imports
- It can import Modrinth .mrpack and CurseForge modpack ZIP archives, plus Vanilla Minecraft and Prism Launcher instances.checked 11 Oct 2026
- Provider integrations
- It supports browsing and installing content from Modrinth, CurseForge, and GitHub.checked 11 Oct 2026
- Purpose
- OpenJar is a Mac-first Minecraft launcher and modding toolkit for managing instances, modpacks, mods, configs, and launches.checked 11 Oct 2026
- Separate instances
- Yeschecked 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.checked 11 Oct 2026
- Troubleshooting
- Run reports and Fix My Instance surface likely causes, recent changes, and reversible recovery actions.checked 11 Oct 2026
Money
- Free plan
- Yeschecked 22 Sep 2026
Where it runs
- Platform support
- Build targets include macOS Intel and Apple Silicon, Linux x64, Windows x64, and Windows ARM64; macOS receives the most manual testing.checked 11 Oct 2026
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