Kagi uses Google (and other) indexes.

The main usecase for Kagi is the fact that you can personally uprank/downrank/pin/block sites. And it has a bunch of creature comforts built in like:

- Attempting to detect AI slop, concatenating listicles ("10 best ...") under one search result heade

- Attempting to block translated Reddit results

- Custom lenses that search only coding resources or recipes or whatnot

- Redirects (so x.com > xcancel.com), although I feel this should be a browser feature

- Better translate than Google

There's probably a few things I'm forgetting.

Kagi is abysmal at image search though. Just assume you will have to use Google for that.