The free version is a book companion and is recommended to use with the book "I Ching Life Coaching by Susan Bernat". It contains no descriptions or definitions of the hexagrams. You can define a question and simulate the classic three coins method to draw the hexagram and the changing lines but gives you no explanation on the result.
UPGRADED VERSION ($0.99)
After downloading the free version you'll be able to upgrade the app with an in-app purchase for only $0.99. The upgraded app includes full description of all hexagrams and changing lines, governing lines and constituent lines. Once downloaded, definitions are available offline and you can use the application any time you need, even when you have no Internet connection.