What is this?

Additive is a simple, modern, open-source alternative to OptiFine. It has basically every feature from OptiFine, including:

• A very high improvement in performance, faster than OptiFine
• Shader pack support
• Extra resource pack features
• Zooming
• Dynamic lighting
• Better grass and snow
• OptiFine donator capes (and free capes)
• Many other key OptiFine features

There are also these other features:

• Free, simple world hosting
  • Simply click “Open Externally” in the menu of your world, and you’ll get a shareable IP
• Modularity
  • This allows you to disable features that are incompatible with other mods, or features you don’t like, it also allows Additive to get partial releases faster than OptiFine
• Fast updates

For more information, read through the Modrinth page.

How do I get it?

For installation and downloads, see this page. It provides an installer for the Mojang launcher, and also instructions for third-party launchers.