Código Tributário Nacional by O Professor is a mobile application designed to provide the latest version of the Brazilian Tax Code (Lei nº 5.172, de 25 de Outubro deto those interested in taking public or private exams. The app offers a practical and objective way for users to organize their studies and improve their performance in the exams.

The app features a collection of reviewed questions based on the latest updates of the Tax Code, allowing users to test their knowledge and track their progress. Código Tributário Nacional is a free app available for Android devices, making it accessible to a wide range of users.