Please read the following
Hey! I'm Capy, the developer of Better Standby! 😄 I made it for people who want to use things like Apple's StandBy feature but don't have a phone that fully supports it, since most phones (including non-pro iPhones) don't have always-on displays. Better Standby features screen burn protection, however to take the best possible care of your screen, I recommend switching, views, colours, or closing the app occasionally. Screen burn is not unique to Better Standby, any app/website can contribute to display wear over prolonged use. Enjoy!