This application offers a calculator that allows you to convert numbers between number systems such as binary, decimal, octal and hexadecimal. The keyboard automatically adapts according to the selected system; For example, when you choose hexadecimal, you will only see valid digits for that system. In addition, it includes a questionnaire section to test your knowledge, with a maximum of 30 questions and the option to select the system to practice. It also has a theoretical screen with sections for binary, octal and hexadecimal, where you can enter numbers and see the conversion process step by step, facilitating the learning and mastery of numerical bases.