Use flux if your OS or phone doesn't have a red shift / red filter built in.
https://justgetflux.com/
I use Twilight. I think my phone does have a red filter though but I was already using Twilight so, watevz
My phone isn't rooted, so I don't think that would work. Thanks for the suggestion though.
@Velocio started
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Use flux if your OS or phone doesn't have a red shift / red filter built in.
https://justgetflux.com/