I like it - fun to compare sites against one another. Perhaps you could define "Best Practices" and "SEO". More insight into how to improve, assume from Lightspeed, would be useful.

I put in my website and the results showed it was nice and speedy. However, at Lightspeed my results have never been close to this good.

Hello, here is the developer of Lightest.app. The app still in development so I really appreciate any feedback, thank you. Do you mean Google Lighthouse on "Lightspeed"?