The ShatteredPrism fork of Prism Launcher supports alternative authentication servers.
Open source
24 alternativesFjordLauncher
Launch Minecraft with FjordLauncher, a Prism Launcher fork that supports alternative authentication servers.
About FjordLauncher
FjordLauncher is a soft fork of Prism Launcher that adds support for alternative authentication servers. Its stated goal is to support servers such as Drasl, Ely.by and Blessing Skin, and a non-exhaustive list is kept in doc/alternative-auth-servers.md. An earlier patchset was proposed to Prism Launcher but was not merged.
Key features
- Soft fork of Prism Launcher with alternative authentication server support
- Names Drasl, Ely.by and Blessing Skin as supported auth servers
- Microsoft account required before adding offline or authlib-injector accounts
- Per-instance custom Loki or authlib-injector agent JARs
- Packaged for Windows, macOS, Linux, Flatpak and Nix
- GPL-3.0 licensed repository with source and build instructions
Best for: Minecraft players who want Prism Launcher's feature set while signing in through alternative authentication servers.
Good for
- Open source under GPL-3.0 with the full source in the repository
- Install options across Windows, macOS, Linux, Flatpak and Nix
- Documents supported alternative authentication servers and agent setup
Watch out for
- The fjordlauncher-bin AUR package is broken according to the readme
- A Microsoft account must be added before an offline or authlib-injector account
- Support is not provided through the Prism Launcher repo or Discord server
FjordLauncher at a glance
- Category
- Gaming › Game Guides, Wikis & Tools
- Type
- Open-source project
- Pricing
- Not confirmed. Check the site
- Open source
- Yes · Source code
- Language
- English
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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FjordLauncher FAQ
How do I add an offline or authlib-injector account?
As with Prism Launcher, you must add a Microsoft account before adding an offline or authlib-injector account.
Where should I ask for help with FjordLauncher?
Ask in the #fjord-launcher channel of the project's Matrix space or open an issue in this repository, rather than using the Prism Launcher repo or Discord.
How do I use a custom Loki or authlib-injector version on an instance?
Select the instance, open the Version tab, delete any Yggdrasil Agents, click Add Agents and pick your Yggdrasil Agent JAR. The JAR's manifest must name moe.yushi.authlibinjector.Premain or org.unmojang.loki.Loki in Agent-Class or Premain-Class.
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