The people who made this video have a great website musicianswithapps.com
It has been very useful for me in finding apps kids love. They review apps for all kinds of instruments and give a rating. They make it easy to find out what the best apps are and even let you know how their kid testers voted and how the teacher voted. You’ve got to check it out! Oh and I use the featured app in my studio – all the kids love it!!!