Free tools for your health

Control the blue light from your screens

to improve your sleep-wake cycle.


f.lux is a free software developed by Michael and Lorna Herf that makes the color of your computer's display adapt to the time of day: warm at night and like sunlight during the day.


PC:  f.lux for Windows

Mac: f.lux for Mac

Linux: f.lux for Linux

Mobile Devices

There are two different free tools depending which operating system you run.

Android: Download Twilight for free

iOS:  As of iPhone 5s, blue light filters are built into the software. To configure it, go to "Settings" from your home screen.  Then choose "Display & Brightness" and Select "Night Shift."