The core activity of Yi Jing GmbH is the digitization and publication of editions of the Chinese classic 'I Ching' (also known as 'Yi Jing' or 'Book of Changes') in the form of an app called 'I Ching - Yi Jing Library'. The company digitizes various translations and commentaries of the I Ching and makes them available in a user-friendly format. The app offers features such as determining answers to questions, displaying hexagrams and trigrams, and providing commentary from the perspective of Western systems theory.