I remember this too so I looked it up. It was Wakie, but it seems that they’ve de-emphasized the wake-up call aspect.
Here’s an article from 2014: https://techcrunch.com/2014/12/10/wakie/
Here’s an article from 2014: https://techcrunch.com/2014/12/10/wakie/
I guess it's one of those ideas that seems fun but has way too much potential for creepiness!