The I Ching or Book of Changes app is a standalone interactive book app that includes the text of Book I by Richard Wilhelm, translated by Cary F. Baynes, in English. Books II and III are available for additional in-app purchase. Question oracle methods include manual input, quick mode (one tap), 3 Coins and Yarrow Stalks. An integrated journal is included.
The Yi Jing app includes several default English translations and many localized translations, but does not include the Wilhelm text by default. Yi Jing includes all of the oracle methods described above plus 4 Coins, Circle of Protectors and Mandala. Yi Jing also provides a Library, to let you organize and quickly switch between book translations, and a Store to add more book translations for additional in-app purchase. The other two apps provide a Sync mechanism to install their content in the Yi Jing app.