4 out of 5 with 24 ratings

f.lux Reviews

Resets Windows Calibration

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This app completely resets Windows calibration settings and the developers aren't willing to fix it even though the issue has been oepnly addressed on their forum multiple times. This makes it completely unusable for me since all my black colors turn to grey and if you're using Windows calibration, you won't be able to use it neither.

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Just an amazing tool for your eyes' health

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f.lux is easy to install, both on Windows and Linux, tracks the Sun position depending on your location on Earth and so behaves very naturally, during day and night, reducing blue light when the sun is going down and setting normal brightness in the morning, thus preventing you from suffering from insomnia due to excess of blue light at night and preventing eye strain at any time. The Windows Beta version is more advanced and it even asks you what's your wake-up hour and has a circadian cycle graph with comments and percentages when you mouse over. Also allows you to choose your preferred light temperature or you can use the recommended one which is constantly changing depending on the moment of the day/night (but you won't notice it). More, it has a temporary/permanent disable mode if you need to watch a movie or work with graphics editing apps (in Linux this is the Pause mode). Since I use both Linux and Windows this app is perfect for me. My only complaint is that the Windows version gets lots of updates and the Betas but on Linux the app is stalled since a few years ago, which is really a shame, although it's still very useful.

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I don't get it

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This application makes my eyes sore and my vision gets blurry when the app comes into play in the evenings. I really don't understand the reason behind so pervasive praising of this program. Dammit, why not just manually adjust the brightness of the monitor at night or, even better, aim to use your computer only during daylight hours? Why would someone rely on some piece of software that's basically aimed to decide what's best for eyes without even knowing the model of the monitor or anything about its settings?
And that expression from the description cracks me up: "During the day, computer screens look good—they're designed to look like the sun." Designed to look like the Sun you say? No sh*t. Last time I tried gazing at the unclouded Sun for more than a couple of seconds I felt like my eyes are going to die on me. I am sure as hell I haven't ever experienced anything similar with any of my bloody computer screens.

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It's not for your eyes, it's for the hypothalamus. So the brain doesn't think it's morning because of the blue light emitted from the screen. We only have natural blue light in the morning and a warm light later in the day. It takes an hour extra to fall asleep after you see blue light than if you didn't. You can't change your settings to mimic natural lighting conditions every few minutes...
If it bothers your eyes that much you might have a problem and should go get them looked at.
I know it's an old post... but still...

There are lots of other more significant factors that define how fast one falls asleep (and the quality of sleep) than being exposed to some light before going to bed. For example if you've been up for 24+ hours straight, you will fall sleep no matter what, even if the sun is shining nicely through your window. Unless of course you have some serious sleep disorder, but flux aint gonna help there moreover.
> It's not for your eyes, it's for the hypothalamus.

I don't care for what exactly Flux is, but the eyes do take some toll most likely than not, because flux makes the picture less legible and harder to make out.

[Edited by Azazel, October 02]


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It works great! It changes the colors of the screen during the day.

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F.lux or LightBulb gonna protect your eyes at night. ( especially on non-dark themed websites :) )
Pros

  • Light
  • Free
  • Portable

[Edited by michaeldev, September 03]

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Makes my eyes feel uncomfortable. Regular screen d...

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Makes my eyes uncomfortable. Regular screen dimmer feels better for my eyes.

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free and lightweight

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Free. Easy. Light.

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works perfectly per what i need

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Very Good
small and fast
if you have Windows 10, no need for it, you can search for: Night light

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flux does better job than windows 10 night light.


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Works great! one time setup and it automatic adjust the light during the day.

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This program has no DCC. The monitor is dimmed by a grey fog instead of reducing the backlight. This is very useful for monitors. With a grey fog the picture quality suffers.
Changing the background illumination is automatically possible with Android from the system, with Windows only via DCC or the buttons on the monitor.

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It blocks more blue light than the night light feature built into Windows 10. Windows 10 also doesn't support scheduling like flux which means you forget to turn it on all the time.

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