I’m a music teacher of private and group lessons in several instruments, and direct adult and children’s voice, chime, and bell choirs, and highly recommend this app! I wish I had discovered it sooner. I teach Solfege in everything I do, and this is a great way to help train the ear to recognize intervals. I love the cat theme, but even more love the accuracy of the pitches and the increasing difficulty as the levels climb, which presents a fun challenge, even for those of us skilled in recognizing and identifying interval steps, skips, and leaps! I ended up purchasing the whole set of these apps, and will use them with my students. Thank you and keep making more of these!!