It’s a tool that hooks into Vulkan applications and allows for postprocessing effects (shaders) to be implemented on top. For me; I use it to enable FXAA, smaa, and FidelityFX Contrast Adaptive Sharpening on games which don’t support those features for whatever reason. (As an example, I’m using DXVK with GTA IV, then vkBasalt on top of that to add antialiasing and sharpening)

It’s a bit annoying to use as you have to add a vkBasalt.conf file to the directory of the game you want to use it with, or edit the system vkBasalt.conf file to reflect what you want to apply system wide.

It is comparable to what Reshade does for DirectX applications.

It’s basically filters for games that use the Vulkan graphics API. You can inject antialiasing methods or sharpening filters directly into the game using the vkBasalt tool.

Here is a comparison video showing how you could configure it to look.