SUPER WHY is not a free app, and in fact, there is a price difference between the iPad version and the iPhone version. For $3.99 at the most, your child has access to letter sounds, rhyming, spelling and storytelling. This program kept great data on how much even a few episodes improved reading scores. Amazing.
The Electric Company Wordball is a free app that features cool and funky videos, appropriate for older students. The more videos you view, in order, the more access you earn to more videos. The new Electric Company has a done the research to know what strategies work for reluctant readers. This is a must download.