Quantify page relevance to keyword

I'm looking for a service which can take a keyword and a URL as input, and generate some quantitative score for how relevant that page is to the keyword. I'd imagine this would use some kind of NLP. Would also be good if the tool checked how relevant the entire domain is to the keyword, instead of just the page.

Does something like this exist? I used to work in SEO (2012-2017 or so), and I think I remember us using something, but I'm not sure. Thanks in advance.