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Might be heavily dependent on OEM and Android version.
On Samsung, it's called Eye Comfort Shield, for example.
@Midnitte right. I didn't think about this, sorry 😁 however, modern Android versions have this option built-in. I used Twilight as well in the past, however, I no longer feel like I need it.
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
Maybe because the whole "blue light in displays" has no real effect on our sleep
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.
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.
If you really want better sleep quality probably a better way is stop using stuff with screens like an hour or so before bed. It's not really the blue light that is the issue, it's the endless content keeping our mind active.
Give your brain time to rest and relax!
Twilight works pretty well
Android has had this built-in for a few releases now.
I would recommend turning the brightness down to near zero. Combine this with Dark Reader for websites (Firefox) and using a white or grey on black night reader mode in ebook reader apps. At first, the display will appear almost unreadable, but your eyes will quickly adjust.
Thanks to all