This works perfectly fine on my iOS 11 iPad- I am unsure if it would be compatible if I updated to the latest iOS but impressed this runs so well, considering how long it has been since it was updated. I would like to see a more recent update just to make sure this app is being supported. I would feel more comfortable recommending it to others that way. Anyhow it is an educationally sound game/spelling activity, supported in a handful of different languages, which is great!