SpellingCity recently launched a free iPad and iPhone app for students. The app gives students access to the same vocabulary lists that they use on the SpellingCity website. SpellingCity’s list of words for students exceeds 42,000. Students and teachers who register for accounts can create custom word lists (Note, new lists have to be made online. Through the app you can only access existing lists). If you don’t register you can simply choose from the many suggested word lists created by SpellingCity.
The SpellingCity app offers six types of practice activities. The activities are Teach Me, Test Me, Match It, Word Unscramble, Hang Mouse, and Which Word. I am particularly fond of the Teach Me activity in which the words and their spellings are read to students. Again, if you are registered and logged into SpellingCity you can create custom lists that are read to your students when they use the Teach Me mode on their iPads.
Disclosure: SpellingCity does help me pay the bills at the Free Technology for Teachers world headquarters.