So cool – Nano for Reddit Review

I just got my watch and this app seems to be recommended a lot i finally checked it out and i just think it's so cool. But i noticed there are 3 different pro versions one can pay and since we ya so cool ? id like to get one especially if it's a one time purchase but I don't know what I'm getting exactly what's the difference between $2 $3 and $4?
Review by 2BeAFitMom on Nano for Reddit.