MiDNI is a free mobile application designed to complement the Spanish National Identity Card, allowing users to verify their identity digitally. This official app serves as a supplementary identification method, ensuring that users can present their credentials in person. The app features a built-in verifier that checks the authenticity of MiDNI credentials, making it a reliable tool for identity verification.

Before utilizing the app, users must complete a registration process, linking their mobile phone to their identity through various methods, including online certificates or in-person verification at designated locations. It is important to note that the app requires a data connection for identity verification and cannot be used for international travel or online authentication. Additionally, it requests camera access to scan QR codes for credential verification, but does not store personal data on the device.