Music Speed Changer on iOS

Hi! I'm Ellis Cho who had been using your music speed changer on android for very long time until changing to iPhone. Your app was really useful for music tuning, and it's still my favorite app more than any other ones on android :-)
Wish to have the same one on iOS, but I'm still wondering why you guys haven't released this incredible app on iOS yet, and I feel bad I won't be able to use it anymore...
Please let me know (ellisjoe611@gmail.com) and have a good day!^^