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How to install "Additive"

A modern, open-source alternative to OptiFine for Fabric

Author

devin

Downloads

360.3K

Last Updated

May 8, 2026

License

MIT

Mod Loaders

Fabric Quilt

Minecraft Versions

26.1.2 1.21.11 1.20.6 1.19.4 1.18.2 1.17.1
lightweight multiplayer optimization

Quick Install ID

#additive

Install Additive in GDLauncher

Additive runs on Fabric, Quilt. Pick whichever your existing instance uses, or create a new one. GDLauncher installs the correct loader automatically.

Install on Fabric

  1. Open GDLauncher and create a new instance (the + button on the Library page).
  2. Pick the Fabric loader and a Minecraft version that Additive supports (26.1.2, 1.21.11, 1.20.6 are common choices).
  3. Open the new instance, go to the Addons tab, and click Add Addons.
  4. Paste the Quick Install ID #additive, find Additive in the results, and hit Download. GDLauncher pulls dependencies automatically.
  5. Hit Play. That's it.

Install on Quilt

  1. Open GDLauncher and create a new instance (the + button on the Library page).
  2. Pick the Quilt loader and a Minecraft version that Additive supports (26.1.2, 1.21.11, 1.20.6 are common choices).
  3. Open the new instance, go to the Addons tab, and click Add Addons.
  4. Paste the Quick Install ID #additive, find Additive in the results, and hit Download. GDLauncher pulls dependencies automatically.
  5. Hit Play. That's it.

Before you install

Make sure your Minecraft version matches what Additive supports. As of the latest release, 26.1.2, 1.21.11, 1.20.6 are supported. Additive supports multiple loaders (Fabric, Quilt); pick whichever matches your other mods. GDLauncher checks compatibility for you and won't install something incompatible with the instance you've chosen.

Frequently Asked Questions

Is Additive free?

Yes. Additive is free to download and install through GDLauncher. GDLauncher itself is also free and ad-free.

What Minecraft versions does Additive support?

Additive supports Minecraft 26.1.2, 1.21.11, 1.20.6, 1.19.4, 1.18.2, 1.17.1. GDLauncher will automatically pick a compatible version when you install it.

Does Additive require Forge or Fabric?

Additive supports Fabric, Quilt. Pick the loader that matches your other mods, or let GDLauncher set up a fresh instance for you.

How do I install Additive?

Open GDLauncher, go to your instance's Addons tab, click Add Addons, and paste the Quick Install ID #additive. GDLauncher handles dependencies and the right Minecraft version automatically.

Who made Additive?

Additive is made by devin. The full project lives on Modrinth (https://modrinth.com/modpack/additive).

Need help?

Read our troubleshooting guide, check the guides section, or join the GDLauncher Discord community.

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