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Flux sunset logo.svg
Developer(s) Michael Herf, Lorna Herf
Initial release February 2009; 6 years ago (2009-02)
Stable release Windows: v3.10
Mac OS X: build 30[1]
Linux: --
iOS: 0.9981[2]
Development status Active
Operating system Microsoft Windows, Linux, Mac OS X, iOS
Available in English
License Proprietary, with free download. (with patent claim)
Website stereopsis.com/flux/

f.lux is a computer program developed by Michael and Lorna Herf. It adjusts a computer display's color temperature according to its location and time of day, based on a user specified set of longitude and latitude geographical coordinates, a ZIP code, or a city name.

The program was designed to reduce eye strain during nighttime use and to prevent disruption of normal sleep patterns.


f.lux is available on all major operating systems, including Microsoft Windows, OS X, and Linux.

f.lux also is available on the iPhone, iPad, and iPod Touch, although it requires the device to be jailbroken. The developers also are working on a version for the Android operating system.[3]


f.lux automatically calibrates the computer or device display's color temperature to the time of the day. The user also has the option of choosing a color preset or disabling f.lux for an hour and returning the screen to its normal calibration. The software offers five preset color settings on OS X: candle, tungsten, halogen, fluorescent, and daylight.[3] For Microsoft Windows, the halogen, fluorescent, and daylight settings are available—as well as Incandescent, Dim Incandescent, Candle as well as Ember and The iOS version uses the same presets as the Mac version.

A "Movie Mode" is available on Windows and OS X that reduces the adjustment for 2.5 hours, which is long enough for viewing most feature films.

The software requires the device's location in order to determine its local sunrise and sunset. Currently the program does not work for locations that are above 65° North.


f.lux has been widely and positively reviewed by technology journalists, bloggers, and users.[4][5][6][7]

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