 The study aims to review how cognitive behavioral elements are delivered by anxiety apps and their functionalities to support user engagement and tailoring based on user needs. The results show that cognitive behavioral apps for anxiety incorporate a variety of functionalities, offer several engagement features, and integrate low-intensity CBT exercises. However, the provision of features to support engagement is highly uneven, and support is provided only for low-intensity CBT treatment. Options for personalization are limited and restricted to goal selection upon beginning use or based on self-monitoring entries. The study concludes that engagement and tailoring features can be significantly expanded in existing apps, which make limited use of social features and clinical support and do not use sophisticated features such as personalization based on sensor data. Further research is needed to explore the effectiveness of different types of engagement features and approaches to tailoring therapeutic content. This article was authored by Andreas Baleskas, Steven M. Schuler, Anna Elcox, and others. We are article.tv, links in the description below.