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Auto brightness and True Tone have two completely different goals. Same with night shift.

Night shift is basically a accessibility feature. Helps to limit blue light exposure. True Tone changes the white point to look more natural in the room it’s in. Like how a white piece of paper looks different depending on the lighting. Don’t think I need to explain auto brightness.

True Tone doesn’t just make the screen yellow/warm. It will even go slightly blue with the correct lighting.

Because I got a new phone and lost data in the process, let's say I've done a lot of backups in the last few days...

With that said during the setup process when Apple ask if you want to keep true tone on (but it really isn't an option to turn off during the setup). It's blatantly obvious that Apple wants you to use true tone; because when you hit the button to see what the screen would look like with it off, it's hilariously more blue/cool than it ever is with the phone fully setup and true tone shut off. I never questioned what night shift did, but what I'm saying about true tone is that the screen looks a lot less vibrant with it on, and auto-brightness does a more than adequate enough job to balance your screen out depending on your lighting conditions.

So, again if my screen is more vibrant with true tone off and auto-brightness makes the necessary lighting transitions for me... Again, what is the point of True Tone!? IMHO, it's Apple trying to make the screen as LCD'ish as possible and not let OLED shine to its fullest potential.

I maintain that True Tone is trash!!!
 
I use True Tone and auto-brightness on my MacBook and iPad and it's great. I don't use either on my XS however as it makes the screen too warm for my taste and in dim lighting I can barely read the screen.
 
Because I got a new phone and lost data in the process, let's say I've done a lot of backups in the last few days...

With that said during the setup process when Apple ask if you want to keep true tone on (but it really isn't an option to turn off during the setup). It's blatantly obvious that Apple wants you to use true tone; because when you hit the button to see what the screen would look like with it off, it's hilariously more blue/cool than it ever is with the phone fully setup and true tone shut off. I never questioned what night shift did, but what I'm saying about true tone is that the screen looks a lot less vibrant with it on, and auto-brightness does a more than adequate enough job to balance your screen out depending on your lighting conditions.

So, again if my screen is more vibrant with true tone off and auto-brightness makes the necessary lighting transitions for me... Again, what is the point of True Tone!? IMHO, it's Apple trying to make the screen as LCD'ish as possible and not let OLED shine to its fullest potential.

I maintain that True Tone is trash!!!

Let me break it down easily for you:

Auto-Brightness, just automatically changes the intensity of the backlight (or in this case, the OLED pixels) to compensate for the amount of light in your environment. Ok,

TRUE TONE, is used to give you a neutral white in *ALL* environments when you're using your phone. If you're in a very dim yellow environment for example, (like a fancy dinner), True Tone will compensate and give you a neutral white in that yellow setting to match, so it makes it more of a warmer tone. Because if you had it off, you'd get a hilariously blue screen in that environment. If you're outside in broad cold white daylight, you don't want your screen to be yellow like in the dinner setting, so it auto corrects it to a more blue spectrum; again, to match the environment and give you a neutral white. This also affects colors, hues and white points and dark points as well.

Think of it like this: Imagine wearing a pair of light blue sunglasses everywhere you go, you can't take them off ever. Would that be ideal? Apple, is basically taking those sunglasses off your face and making you see everything how it's *SUPPOSED* to look, ie: a calibrated display. It's actually a pretty amazing feature. Blue/cooler screens are actually a disadvantage of OLED displays--even though you think you want those vibrant colors, it's not true to life nor accurate.

I calibrate HDTVs as a hobby and I was pretty shocked when Apple introduced TrueTone. I get that the majority of people go "meh" but it's a big deal in terms of display. It's awesome.
 
I love it. It’s a game changer for me. I couldn’t go to a phone without it now. I use my 7+ (without TrueTone) from time to time, and the difference compared to my XS Max (with TrueTone) is very obvious to me. TrueTone looks way better.
 
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