What's a good Android app for learning about secret codes and ciphers?

Hacker is an excellent Android app for anyone interested in learning about and experimenting with secret codes and ciphers. The app provides a comprehensive overview of different encryption methods, ranging from simple classical ciphers like Caesar and Vigenère to more complex modern techniques. Its user-friendly interface makes it easy to encode and decode messages using various algorithms. The app also includes detailed explanations of each cipher, making it a valuable educational tool. Users appreciate its clear presentation and the ability to easily test out different encryption methods. Whether you're a student, a hobbyist, or just curious about cryptography, Hacker provides an engaging and informative experience. It allows you to understand the principles behind secure communication and appreciate the ingenuity of historical and contemporary ciphers. The app also promotes critical thinking and problem-solving skills, making it a fun and educational experience for users of all ages.