Uses Apple’s "Developer Certificate" system to sideload .ipa files. It works on standard iOS devices but is subject to "revokes" by Apple. Troubleshooting Scarlet Repos Handling Revokes
It is important to understand that Scarlet . Cydia Repo For Scarlet
You are using Scarlet to install the exact same modified apps that Cydia users enjoy. Uses Apple’s "Developer Certificate" system to sideload