An IPA is the file format used for iOS apps. A "Premium IPA" is a version of the official Crunchyroll app that has been modified (or "cracked") by third-party developers. These files are usually "sideloaded" onto an iPhone or iPad using tools like AltStore or TrollStore to bypass the official App Store. The Catch: Why "Free" Isn't Always Free
: Guaranteed free of malware and verified by Apple’s App Store security. crunchyroll premium ipa free