Tech Radar provides a comparison of phonics apps worth checking out at:
Phonics is the primary way in which children learn basic literacy at schools and you can help them learn with these great iOS apps.
Comparisions of phonics apps for iPad at TechRadar: http://www.techradar.com/news/mobile-computing/tablets/6-best-phonics-apps-for-ipad-teach-kids-to-read-write-and-spell-1143996
Which one did they rate for best for content and usage?
See on www.techradar.com