Tử Vi is a free astrology app developed by lasotuvi for Android devices running on version 9.0 or higher. This app generates birth charts and provides automatic interpretations and analysis of the chart. Users can zoom in on each house to view the stars and planets in detail, and the app offers automatic interpretations of each house.

The app also includes annual star charts and allows users to save data and edit saved data. The interface is user-friendly and the app can be used on any screen size. Additionally, the app includes a section with the astrological treatise of Lê Quý Đôn, providing users with a wealth of information about astrology. Overall, Tử Vi is a comprehensive astrology app that offers a range of features for both novice and advanced users.