Hair loss app.

I am 37 and was getting a bit concerned about my hair. I had it medium to long recently and thought it felt a bit thinner. I do the “pull test” and I get like 2 or 3 hairs each pull of roughly 100 hairs. Is this normal? Also I had 2 PRP and PRF treatments which improved my scalp health and hair feels so good. My crown has finer hair but only looks bad under direct bright light. Anyway, are these apps accurate? Was it all in my head (excuse the pun)