Fjord Launcher is a soft fork of Prism Launcher with the goal of adding support for alternative authentication servers such as Drasl, Ely.by, and Blessing Skin. An early version of Fjord Launcher's patchset was proposed to Prism Launcher in PrismLauncher/PrismLauncher#543. It received positive feedback, but the maintainers did not reach agreement about whether it should be merged.

I plan to someday try again to upstream these changes, since I believe most Prism Launcher users and developers agree that alternative authentication servers should be supported, with appropriate safeguards against piracy.

Akin to Prism Launcher, Fjord Launcher requires adding a Microsoft account before adding an offline or authlib-injector account.

See doc/alternative-auth-servers.md for a non-exhaustive list of alternative authentication servers.

Do not open an issue in the Prism Launcher repo, and do not ask about Fjord Launcher in the Prism Launcher Discord server. Instead, ask in #fjord-launcher in our Matrix space, or open an issue, in this repository.

scoop bucket add unmojang https://github.com/unmojang/scoop-unmojang
scoop install unmojang/fjordlauncher

You can get installers or portable builds from the releases section, MSVC builds are recommended over MinGW builds, but there's no real difference.

brew tap unmojang/homebrew-unmojang
brew install --cask fjordlauncher

There are builds for macOS in the releases section.

flatpak remote-add --user --if-not-exists unmojang https://unmojang.github.io/unmojang-flatpak/index.flatpakrepo
flatpak install org.kde.Platform/x86_64/6.10
flatpak install org.unmojang.FjordLauncher

Fjord Launcher is available from the AUR:

paru -S fjordlauncher
paru -S fjordlauncher-git # build latest Git commit from source

fjordlauncher is available in Chaotic-AUR.

The fjordlauncher-bin AUR package is broken; see #20.

This repository contains a Nix flake:

nix run github:unmojang/FjordLauncher

See nix/README.md for details.

Install from the GURU repository:

echo 'games-action/fjordlauncher' >> /etc/portage/package.accept_keywords
emerge -av games-action/fjordlauncher

AppImages are available in the releases section.

To build the launcher yourself, follow the instructions on the Prism Launcher website, but clone this repo instead.

• You can easily use a custom version of Loki or authlib-injector on an instance. Select the instance in the main window, go to the Version tab, delete any Yggdrasil Agents if present, click "Add Agents", and select your Yggdrasil Agent JAR. If your JAR is not correctly identified, make sure the Agent-Class or Premain-Class field in the JAR's MANIFEST.MF matches either moe.yushi.authlibinjector.Premain or org.unmojang.loki.Loki.