Biển Số Xe - Tra bien so xe is a free Android app developed by HApplications that allows users to search and obtain information about license plates in Vietnam. The app provides basic information about license plates in different provinces and cities, which can be accessed offline, making it convenient for users who have limited internet access.

One of the key features of the app is its easy-to-use search function. Users can search for license plates by either the license plate number or the name of the province or city, with options for searching in both Vietnamese with and without diacritics. With a file size of only 4MB, the app is lightweight and does not take up too much storage space on your device.