This app is fairly useless for kids above the age of 3. It doesnt teach anything phonetically which is essential to learning at that age. My 3 year old was easily able to finish but when I wrote the same words on a board, she couldnt say it. The use of pictures puts the emphasis more on identifying than actual reading. The bobs scholastic books were much more useful and so was Kumon.
SidU2010 about Kids Learning to Read - Little Reader CVC Words