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: 
As per the Google Product [forum answer](https://productforums.google.com/forum/#!topic/docs/_mgdBX6y53A;context-place=topicsearchin/docs/category$3Akeep$20storage$20space) no data attached to Google Drive account.
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)