Poll: Which Blue light filter software do you use?
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Iris Mini or Pro
3 60.00%
0 0%
CareUEyes Lite or Pro
1 20.00%
1 20.00%
Other Programs - please add as a reply to this thread.
0 0%
None: My eyes are perfect!
0 0%
Total 5 vote(s) 100%
* You voted for this item. [Show Results]

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Free Blue light filter software[Iris mini, f.lux, CareUEyes Lite, twilight][Jan 2024]
Free Blue light filter software[Iris mini, f.lux, CareUEyes Lite, twilight][Jan 2024]

Please participate in the Poll at the top of this thread. 
You can tick several options.
Please reply to this thread with your experience, pros and cons of any listed or additional software you have used.

Blue light filter software
  1. Iris mini
  2. f.lux
  3. CareUEyes Lite
  4. Twilight
  5. Windows 10/11 Night Light

Whats is blue light?
Experts think digital eyestrain, or computer vision syndrome, affects about 50% of computer users. Symptoms include dry, irritated eyes and blurred vision.

Blue light may also damage your retinas. That’s called phototoxicity. The amount of damage depends on wavelength and exposure time. Animal studies show even short exposure (a few minutes to several hours) may be harmful. A filter that cuts 94% of blue light has been shown to lessen damage.

There’s evidence blue light could lead to permanent vision changes. Almost all blue light passes straight through to the back of your retina. Some research has shown blue light may increase the risk of macular degeneration, a disease of the retina.

Research shows blue light exposure may lead to age-related macular degeneration, or AMD. One study found blue light triggered the release of toxic molecules in photoreceptor cells. This causes damage that may lead to AMD.

Blue Light and Sleep
Screen time, especially at night, is linked to poor sleep. The blue light from electronic devices messes with your circadian rhythm, or sleep cycle. It signals your brain to wake up when it should be winding down. In one study, as little as 2 hours of exposure to blue light at night slowed or stopped release of the sleep hormone melatonin. Powering down your digital devices at least 3 hours before bedtime can help.

Info from

My 2 Cents worth:-
I use CareUEyes Lite and Iris mini on PC and laptop and Twilight on Android phone.
I used F.lux in the past. It was great as well.

I Permanently run Twilight on Android phone. My eyes get sore otherwise.
All are great.

Iris mini - Free
Versions - Windows  Mac and Linux

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Can upgrade:-

f.lux - Free
(Available for Windows Mac Linux iPhone/iPad Android)

Ever notice how people texting at night have that eerie blue glow?

Or wake up ready to write down the Next Great Idea, and get blinded by your computer screen?

During the day, computer screens look good—they're designed to look like the sun. But, at 9PM, 10PM, or 3AM, you probably shouldn't be looking at the sun.

f.lux fixes this: it makes the color of your computer's display adapt to the time of day, warm at night and like sunlight during the day.

It's even possible that you're staying up too late because of your computer. You could use f.lux because it makes you sleep better, or you could just use it just because it makes your computer look better.

f.lux makes your computer screen look like the room you're in, all the time. When the sun sets, it makes your computer look like your indoor lights. In the morning, it makes things look like sunlight again.
Tell f.lux what kind of lighting you have, and where you live. Then forget about it. f.lux will do the rest, automatically.

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Can choose a device and see with and without F.lux
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Can choose a device and see with and without F.lux  - Devices compared.
Excellent Website. Part of f.lux
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CareUEyes Lite - Free
Windows Version

On April 15, 2019, we released the freeware CareUEyes Lite.

CareUEyes Lite has the features of brightness adjustment, which has four brightness levels to choose from 20%-40%-60%-80%, all the operation interface is in the tray area.

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Unlike other brightness adjustment software, CareUEyes Lite does not use translucent windows to reduce brightness. It directly controls the gamma value of the display and is therefore not affected by the start menu and taskbar. It also does not affect the color of the mouse cursor and screenshots.

In addition, click on the tray icon, you can easily restore or turn off the brightness adjustment features of CareUEyes Lite, very practical.

CareUEyes Lite’s performance is the best, it can work very well even on a poor performance machine, it only uses 600kb of disk space and 1m of memory and uses as little CPU time as possible.

Pro version

Twilight - Free

Twilight  for Android

Are you having troubles to fall asleep? Are your kids hyperactive when playing with the tablet before bed time? Are you using your smart phone or tablet in the late evening? Twilight may be a solution for you!

Recent research suggests that exposure to blue light before sleep may distort your natural (circadian) rhythm and cause inability to fall asleep.

The cause is the photoreceptor in your eyes, called Melanopsin. This receptor is sensitive to a narrow band of blue light in the 460-480nm range which may suppress Melatonin production – a hormone responsible for your healthy sleep-wake cycles.

In experimental scientific studies it has been shown an average person reading on a tablet or smart phone for a couple of hours before bed time may find their sleep delayed by about an hour. Please read a nice summary on the role of light in our lives: How Candles Can Make You Lose Weight And Sleep Better.

The Twilight app makes your device screen adapt to the time of the day. It filters the blue spectrum on your phone or tablet after sunset and protects your eyes with a soft and pleasant red filter. The filter intensity is smoothly adjusted to the sun cycle based on your local sunset and sunrise times.

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Windows 10/11 Night Light - Free built in:-
To enable the Blue Light mode in Windows 10
Select Start > Settings > System > Display > Night light > Night light settings.

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Excellent Program.
F.lux.- Free
(Available for Windows Mac Linux iPhone/iPad Android)

Added to Original Post.
Can choose a device and see with and without F.lux  - Devices compared.
Excellent Website. Part of f.lux

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Updated Tutorial with:-

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