f.lux

Just an amazing tool for your eyes' health

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.

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.

Windows 10 Night Light feature did not provide sufficiently warm color temperature. f.lux also surprised with a non intrusive reminder about my wake-up time.

Cool

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

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]