What Are the Blue Light Filter Options for an iPhone?

Reviewed by the BioHackers Lab Team | Last updated: August 21, 2020

There are two free software options available to help reduce the amount of artificial blue light emitted from your iPhone screen.

  1. The weaker Night Shift Mode option
  2. The stronger Red Color Filter Mode + Shortcut Tip option
Night Shift vs Red Color Filter Side by Side Results

Using one of these iPhone settings will help to limit the amount of blue light emitted from your screen, which is a good idea to do to help protect your natural circadian rhythm (wake-sleep cycle).

However, I would use one of these iPhone settings in conjunction with also wearing a good pair of 100% blue light blocking glasses for adults or children’s glasses at night. (You can also get blue light reading glasses if needs).

How to Turn on Night Shift on Your iPhone

Go to Settings > Display & Brightness > Night Shift > Scheduled or Manually Enable Until Tomorrow

Since the release of the iOS 9.3 software update, Apple allowed iPhone and iPad users to activate the inbuilt Night Shift option on their iPhones.

Night Shift automatically shifts the colours of your display to the warmer end of the colour spectrum after dark. This may help you get a better night’s sleep.

Message on iPhone Screen

Step 1: Go to “Settings”

iPhone settings screen

Step 2: Go to “Display & Brightness”

iPhone Display and Brightness option

Step 3: Click “Night Shift”

iPhone screen click night shift

Step 4: Choose either “Scheduled” or “Manually Enable Until Tomorrow” options

Step 5: Move the color temperature slider to desired result

Step 6: Done, see the result

Result of the Strongest Night Shift Filter Option

This research study questioned how effective the two different Night Shift settings they tested were in helping to reduce the effect of blue light on melatonin suppression.

You will visibly see how the next option I have for you is even better and is my preferred option.

How to Turn Your iPhone Screen Red Using Color Filter Mode

Go to Settings > Accessibility > Display & Text Size > Color Filters > Color Tint

You can use the color filter accessibility option to also help filter out blue and green color spectrum from your iPhone display.

I found using this red color filter setting option will help filter out more of the visible blue colour than the Night Shift option.

Step 1: Go to “Settings”

Step 2: Go to “Accessibility”

iPhone screen click accessibility

Step 3: Go to “Display & Text Size”

Step 4: Go to “Color Filters”

Step 5: Toggle the “Color Filters” on

Step 6: Click to select “Colour Tint”

Step 7: Move the “Intensity” and “Hue” sliders to the far right position for maximum redness effect

Step 8: Done, see the result

Result of the Strongest Color Filter Option

How to Create a Triple-Click Shortcut to Switch Color Modes

Go to Settings > Accessibility > Accessibility Shortcut > Select Color Filters

Use this shortcut so that every time you triple-click the button on the right side of the iPhone, it will switch between the regular screen brightness and red color tint and vice versa.

Step 1: Go to “Settings”

iPhone settings screen

Step 2: Go to “Accessibility”

Choose iPhone Accessibility setting

Step 3: Go to “Accessibility Shortcut”

Find it by scrolling all the way to the bottom.

Step 4: Choose the “Color Filters” option from the list, and you’re done


I hope you found the steps easy enough to do.

For me it is clear that using the red color filter option is the better one to go with for maximum reduction in visible blue and green wavelengths.

You can also change the settings on your Android phone, Windows computer and Mac computer to help filter out blue light.

Some extra resources you should try next are:

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