Which mobile apps would you recommend for 3-4 yr olds on Apple App Store?

My colleague recently downloaded these two apps for her 3.5-year old daughter after reading this article: http://www.geekswithjuniors.com/best-apps-for-3-year-olds/ Mathlandia Super WHY Phonics Fair Shape the Village Her daughter loves these. She would sometimes get her daughter to replay some of the games in Mathlandia as practice. You can consider these and some other apps suggested in the article. :)