Snobify was created by and is maintained by me, Noah Mushkin. I created the app after I realized how much my brother and I wondered if we showed each other artists / songs or who found them first. Although music shouldn't be about competition, sometimes you just want to know these things. If you find anything wrong with the app, or have any questions about it, send me an email: noahmushkin at gmail.com.
One thing to note: Snobify estimates when you find an artist / track based on when you first saved that artist / track or added them to a playlist. It takes the minimum if you've added the track to more than one place. Even though this isn't perfect, I've found it's a good proxy for discovery if you save most of the music you enjoy, which is probably the music you want to compare anyways.