Night shift (blue light filter) app alternatives for older iPads (e.g. iPad 4)
There is [this code repo on GitHub that has a f.lux app](https://github.com/jefferyleo/f.lux) (which is no longer available on App Store). I’ve managed to deploy it on my device via Xcode, but after about a week any app deployed via XCode wouldn’t launch, unless I pay $100 annually for iOS Developer License, or create a new signing certificate and re-deploy the app to the device on a weekly basis.
Since I still have the device working fine and plan on keeping it for reading (and especially – for night-time reading), I wanted to find out what else I could do to minimize my exposure to blue light from the screen?