Interval Runner, developed by J Squared Multimedia, is an upcoming app that aims to improve users' musical skills by providing ear training exercises. The app is designed to help users enhance their ability to recognize and reproduce musical intervals accurately. By putting a music teacher in users' pockets, Interval Runner offers a convenient and accessible way for individuals to practice and improve their singing or playing skills. With its user-friendly interface and comprehensive exercises, the app is set to become a valuable tool for musicians and music enthusiasts looking to enhance their musical abilities.