Wednesday, November 20, 2013



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.

In other words, it makes the color temperature cooler (bluer, higher Kelvin) when the sun is high and warmer (yellower, lower K) when it’s dark out. In theory, this is easier on your eyes compared with the normal calibration of always using cool/bright whites; and the warmer colors keep your body from being confused about the time of day, which can help you sleep. There’s also an iOS version, but of course this sort of system-level utility is only possible via jailbreaking. The Kindle, Instapaper, and iBooks apps include a sepia mode, which provides a similar effect. (iBooks only provides this option for certain types of books.)

Update (2015-11-06): GammaThingy doesn’t require jailbreaking on iOS, but you have to compile the app yourself.

4 Comments RSS · Twitter

I've been using Flux for years. It's really nice to be tired at night while still using the computer. I highly recommend it.

[...] More control over the background color, since iOS doesn’t support Flux. [...]

[…] This seems to only change the brightness. It doesn’t change the color temperature like f.lux does. There is a limited way to do that in iOS via Settings ‣ General ‣ Accessibility […]

[…] the excellent Mac display color adjuster, has not been available for iOS except via jailbreaking. Now, however, there is a way to sideload it […]

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