Where to find the blue light filter on your iPhone

The blue light filter on iPhone is called Night Shift, and you turn it on through Settings. Open Settings, tap Display & Brightness, then tap Night Shift. You'll see a toggle at the top — tap it to turn Night Shift on right now, or set it to turn on automatically at a specific time each day.

Night Shift reduces the amount of blue light your screen emits by making the display warmer (more yellow and orange, less blue and white). This happens because blue light can interfere with melatonin production, the hormone that tells your body it's time to sleep. If you use your phone in the evening, Night Shift can make it easier to fall asleep afterward.

The filter works on all modern iPhones — iPhone XS and newer, plus iPhone XR and later. If you have an older iPhone, Night Shift may not be available, though you can check by going to Settings > Display & Brightness to see if the option appears.

Key Takeaways

  • Night Shift is Apple's blue light filter, found in Settings > Display & Brightness > Night Shift.
  • You can turn it on immediately with the toggle, or set it to turn on and off automatically at times you choose.
  • The Warm Color Temperature slider lets you control how much the screen shifts toward yellow — stronger shifts block more blue light but look more orange.
  • Night Shift works on iPhone XS, XR, and all newer models, but not on older phones.

Setting Night Shift to turn on automatically

If you want Night Shift to activate without you having to remember, set it to a schedule. In Settings > Display & Brightness > Night Shift, tap the "Scheduled" option. You'll see two time fields: one for when Night Shift turns on, and one for when it turns off.

Most people set it to turn on around sunset and turn off around sunrise. If you're in a place where sunset varies by season, you can choose "Sunset to Sunrise" instead of entering fixed times — your phone will use your location to figure out when the sun goes down each day and turn Night Shift on automatically.

If you choose fixed times instead, enter the times you want. For example, you might set it to turn on at 9 PM and turn off at 7 AM. Once you've entered the times, Night Shift will follow that schedule every day without you having to do anything.

Adjusting how strong the blue light filter is

Night Shift has a strength slider labeled "Color Temperature." When you're in the Night Shift settings, you'll see a slider that goes from Less Warm (left) to More Warm (right). Moving it to the right makes the screen more yellow and orange, which blocks more blue light but also makes colors look less natural.

There's no "correct" setting — it depends on what feels comfortable to you. Some people prefer a subtle shift they barely notice, while others like a strong orange tint. You can adjust the slider and watch your screen change in real time, so you can find the level that works for your eyes and your sleep.

If you find that Night Shift is too strong and making text hard to read, move the slider back toward Less Warm. If you're not noticing any difference and you want more of an effect, move it toward More Warm.

Turning Night Shift on and off quickly from Control Center

Once you've set up Night Shift in Settings, you can turn it on or off without going back to Settings every time. Swipe down from the top-right corner of your screen (or up from the bottom, depending on your iPhone model) to open Control Center. Look for the brightness controls — you'll see a sun icon. Press and hold on that area, and a menu will appear with Night Shift as an option.

Tap Night Shift to toggle it on or off. This is faster than going through Settings if you want to disable it temporarily — for example, if you're editing photos and need accurate colors, or if you're watching a movie where the orange tint is distracting.

Why Night Shift might not be working

If you've turned on Night Shift but your screen doesn't look warmer, check whether you have True Tone enabled. True Tone is a separate feature that also adjusts your screen's color, and it can interfere with Night Shift's appearance. Go to Settings > Display & Brightness and toggle True Tone off to see if Night Shift becomes more noticeable.

Another reason Night Shift might seem inactive is if you're using an app that overrides system settings. Some apps, particularly those designed for photo or video editing, can disable Night Shift while they're open. Close the app and Night Shift should work again.

If Night Shift is on but you genuinely don't see any color change, try moving the Color Temperature slider all the way to the right (More Warm) to see if the effect becomes visible. If it still doesn't change, restart your iPhone — sometimes the display settings need a fresh start.

Night Shift versus other blue light options

Night Shift is built into iOS, so it doesn't cost anything and works on all supported iPhones. Some people use blue light glasses instead of or in addition to Night Shift — these are regular glasses with lenses that filter blue light. Both approaches reduce blue light exposure, but Night Shift is free and always with you since it's on your phone.

You can also reduce blue light by lowering your screen brightness, using a dark background, or simply using your phone less in the hours before bed. Night Shift works best as part of a routine: turn it on in the evening, and pair it with other habits like putting your phone down 30 minutes before sleep.

Frequently Asked Questions

Does Night Shift actually help you sleep better?

Research shows that blue light exposure in the evening can delay melatonin release, which makes it harder to fall asleep. Night Shift reduces that blue light, so it may help — but the effect is usually small. It works best if you combine it with other sleep habits, like putting your phone down before bed and keeping your bedroom dark.

Can I use Night Shift while I'm working during the day?

You can, but most people don't need to. Night Shift is designed for evening use because that's when blue light interferes with sleep. During the day, blue light helps you stay alert, which is usually what you want. If you find the daytime orange tint bothersome, turn it off during work hours and let the schedule turn it back on in the evening.

Will Night Shift drain my battery faster?

No. Night Shift is a display filter that doesn't require extra processing power. It may use slightly less battery than a bright white screen, since the warmer colors require less energy, but the difference is too small to notice.

What's the difference between Night Shift and Dark Mode?

Dark Mode changes your app backgrounds from white to black, which reduces overall brightness and can be easier on your eyes in low light. Night Shift changes the color temperature of everything on your screen, reducing blue light specifically. You can use both at the same time — they do different things.

Can I set different Night Shift schedules for different days?

No. Night Shift uses one schedule that applies every day. If you need different times on weekends versus weekdays, you'll have to manually turn it on and off, or use the Control Center toggle to adjust it as needed.