Question: I've tried searching for the answer but couldn't find it. Do the notes stored in Google Keep use space from the Google storage? Or is it free and unlimited like a Google doc in Google Drive?

EDIT: that's too good to believe they would give unlimited storage for pictures and audio recordings.

Any update?

Answer: 
It seems there is no limit for Google Keep storage according to [this article](http://www.techradar.com/news/internet/web/google-keep-vs-evernote-vs-apple-notes-1139656).
There is a limit for the number of items in a Google Keep list. By my estimate, that limit is 1,000.

[![Google Keep list items left](https://i.stack.imgur.com/mJyma.png)](https://i.stack.imgur.com/mJyma.png)