Most people, even musicians, don't know that this talent exists. When I was in high school, there was someone who has this skill. He had started music when he was a very little. Most perfect pitch persons starts their music in their early ages. This person in my school "senses" pitches (I think it's similar to how we see colors.)
THERE'S NO KNOWN CASES OF ANY ADULT DEVELOPING PERFECT PITCH. There's a number of studies saying it cannot be developed as an adult.
However, I'm doing research for a few months and trying to develop perfect pitch myself (I have a fine relative pitch). None has worked for now. I strongly believe there must be a way for adults to develop this.
My thoughts on this app: It may help to improve something called "tone identification", but that instinct of having perfect pitch is completely different.
By the way, anyone here have perfect pitch (possibility is 1/10000)?
(For any one interested, search Youtube for perfect pitch. There's a lot of fascinating stories)