The core functionality of Opal's app is to block distracting apps. In order to do this, Opal uses Apple's Screen Time API technology, which you need to give permissions for. There is no other way to do this on iPhone (Apple limitations).
We take privacy very seriously. Unlike most apps, we make sure private browsing data never leaves your device. Whenever possible, we will keep your data on your phone (client) and never store your data on our servers.
Read more: What do you do with my data?