Launch: Holder – Open-Source Secure Offline Card Vault (apps.apple.com)

Excited to launch Holder - a secure, offline card vault aiming to simplify digital transactions. It’s ideal for regions without Apple Pay, ensuring ease of access and security. Features include iOS Keychain integration, Face/Touch ID security, and a user-friendly interface. Completely open source on Github. Looking forward to your feedback and suggestions!

I don't understand what this is.