This app trying to charge you what iPhone offers for free
Go to your “brightness” setting from up top of your screen. Tap and hold the ‘brightness’ sun icon and you will have options to turn on blue light blocker. These people trying to charge naive people to make extra bucks. Google it to figure it out how to set up to block blue light for free from your iPhone as it is built-in to your phone. Shame on you this app developer. Plus this app is so bad that it only works when you are using their app to surf the web but other apps does not even work and they try to charge you money 🤨