[Google Ngrams](https://books.google.com/ngrams) is a great resource for provenance tracking of words and phrases in published English books. It is essentially a histogram computer for frequency of word use over the date which allows comparison among a number of words/phrases.

That is purely a search on books in Google's scanned catalog. Is there any similar app to do the comparison on words that are on web pages?

I noticed the lack of such a tool when I went to compare two words in order to answer a question. Google ngrams gave zero hits, which surprised me because others were referring to a number of google hits. Then I realize they were using the regular search for that. But there was no way to do a comparison.

I understand that there's a difficulty with -dating- an occurrence of a word, but one could at least return just the number of hits -now- for a set of words/phrases (instead of doing each search separately and recording the number of hits for each one).

So is there a tool like Google Ngrams for the words on web pages?