SpellingCity has just released a free iOS app that goes hand in hand w/ their educational website. This app allows students to play 7 of SC's most popular games. Also, these games can incorporate vocab and word lists from their teachers/parents (members) of SpellingCity. This is a great mobile tool to increase vocab and spelling w/ the ability to integrate word lists from SpellingCity's website.
I highly recommend checking out SpellingCity by clicking here!!!