Android has had this built-in for a few releases now.
this post was submitted on 22 Oct 2024
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@Tucumano88 Settings > Display > scroll all the way to "color"
Might be heavily dependent on OEM and Android version.
On Samsung, it's called Eye Comfort Shield, for example.
I just manually turn on "Night light" if I need it before it automatically kicks in. I think that's available in stock, but I only have LineageOS on my devices.
I use it, but I don't notice any difference in my sleep quality
That is a blue light filter, so you shouldn't need a third party filter. The science just isn't out there to show whether or not it helps with sleep, though. It might help, but other things like not using screens within a couple hours to bed and not using phones in bed has better outcomes.
Maybe because the whole "blue light in displays" has no real effect on our sleep
I can't say I notice any difference, either**, but it does seem like it reduces headaches for me and makes it easier on my eyes in low light.
** I'm an insomniac, so "better sleep" is often "any sleep I can get" lol.
Twilight works pretty well