Ask HN: WebApp User tracking

a few months ago there was a Show HN for a new service which makes it easy to track user activities on a page by just including a script on the page.

Then you can define events in their application for button clicks or clicks on some #id and analyze this data.

I searched for over an hour at https://hn.algolia.com/ but can't find them or their service.

Does anybody know what I'm talking about?

Thank you!