Vio App is a free utility and tools application available for iPhone users. Developed by Servico Federal de Processamento de Dados SERPRO, this app allows users to read printed Vio QR Codes on compatible documents and view all the original data, including the photo, on their cellphone screens. It provides a convenient way to compare the document with the information displayed on the Vio App and verify its authenticity.

Currently, Vio supports various Brazilian government documents such as driver's licenses (CNH), national identity cards (DNI), vehicle licenses (CRLV), and license plates (Placa Veicular). The Vio QR Code technology, created by SERPRO, is unique and different from other common QR Codes, which is why the Vio App can only read its own QR Codes.

One of the notable features of Vio is that it works offline. Users can read and decode Vio QR Codes without requiring an internet connection. In the future, the app plans to expand its support to include other official government documents.