True Tone on iPhone automatically adjusts the screen’s color temperature and brightness to match the light around you, so whites look more natural and the display feels easier on your eyes.

What True Tone actually does

  • It uses ambient‑light sensors (front and back) to measure the color temperature of your surroundings.
  • In warm light (like a cozy indoor lamp), the screen shifts slightly warmer ; in cool, bluish light (like an office under LEDs), it shifts cooler.
  • The goal is to make the screen look more like paper under the same lighting , reducing how “jarring” the display feels.

How it feels in real use

  • Photos and web pages still look accurate, but the white background of apps subtly changes to blend with the room.
  • Many users say it feels less harsh at night and more comfortable for long‑term reading or browsing, though some prefer the default, more consistent color.

True Tone vs Night Shift

  • True Tone adjusts color in real time based on ambient light (any time of day).
  • Night Shift shifts the whole screen warmer at night on a schedule, mainly to reduce blue light.
  • You can use both at once, but they serve slightly different purposes.

How to turn True Tone on or off

  • Go to Settings → Display & Brightness → toggle True Tone on or off.
  • On newer iPhones, you can also open Control Center , long‑press the Brightness slider , and tap True Tone.

Which iPhones support it

  • True Tone is available on iPhone 8 and later (including iPhone SE 2nd gen and newer, and all Pro models).

If you tell me your iPhone model, I can walk you through exactly where to find the toggle in your version of iOS.