NyanPass is an iPhone application designed for easy management of domestic cat information. Users can register their cat's details such as birthday, age, days until the average lifespan, days elapsed from the average lifespan, and even the cat's age in human years. With a simple tap on the cat's name, all the information is readily available. The app supports multiple entries for cat profiles, making it convenient for users with multiple pets.

Moreover, NyanPass includes a feature to set birthday reminders, ensuring that users never forget their beloved cat's special day. Additionally, the app offers a memorial service feature, allowing users to honor and remember their departed feline companions.