Umbalena is a leading interactive reading app for kids aged 2-10 in Vietnam. It is an app that offers an extensive collection of quality books, enabling children to develop a reading habit naturally. The app is developed by VOOC Technology, and it aims to build a generation of Vietnamese children who love to read. Umbalena features a vast library of nearly 1,000 books, including a collection of 3D storybooks produced in collaboration with UNICEF Vietnam. The app's contents are divided into nine levels, equivalent to nine islands that need exploring, and each level comes with rewards and medals.

Umbalena offers a rich and engaging content, with over 70 themes ranging from familiar to new, such as friendship, family, science, and daily life. The contents are presented in a humorous, fun, and lively way, with illustrations that match the age and interests of the children. Moreover, Umbalena offers a read-aloud feature with various accents to enhance the reading experience.