Luồng Xanh - Sổ tay bác tài is a free Android application developed by An Vui JSC that serves as the ultimate travel companion for drivers. It helps drivers in managing their travel documents and provides them with access to various services related to their vehicles.

The app comes with four main features. The first feature, QR Của Tôi, allows drivers to store all their Luồng Xanh QR codes, travel QR codes, and card QR codes in one place for easy access. The second feature, Nhật ký, helps drivers keep track of their travel history, including the locations where they stopped and the services they used. The third feature, An Toan, provides drivers access to various driver care services, including vehicle maintenance and insurance. Finally, the fourth feature, Tài khoản, stores all the driver's information, including licenses, registration, and inspection documents, and sends reminders for renewal dates.

Overall, Luồng Xanh - Sổ tay bác tài is a must-have app for drivers, especially those who travel long distances. An Vui JSC has been continuously adding new features to the app to make it more convenient for drivers.