How to sideload f.lux on your iPhone or iPad with Xcode 7

By , Nov 10, 2015

iPhone flux sideload iOS 9

The folks over at f.lux have released a sideloadable version of their popular utility for all iOS devices running iOS 9. The utility, which was once limited to jailbroken iPhones, can now be installed on any iOS 9 device, even the new iPad Pro, without a jailbreak.

f.lux is a utility that allows your iPhone to automatically adjust the screen temperature according to the time of day. It’s a utility that I use every day on my Mac, and it makes working on my computer in a dark environment much easier on my eyes. The same premise applies to iOS devices as well.

Would you be interested in using f.lux on your iPhone? Check out the full tutorial inside.

Step 1: Download the flux for iOS Xcode project

Step 2: Open the Xcode project, and use our sideloading tutorial for iOS 9 to sideload f.lux on your device

Note: Under Targets →  iflux →  General →  Identity, add a word to the end of the Bundle Identifier to make it a unique name.

side load f.lux Xcode

Change the Bundle Identifier to something unique. I just added “jeff” to the end.

Once you sideload f.lux, you may need to allow the app via Settings → General → Profile → Your Apple ID. You’ll also need to enable Locations and Notifications once you actually launch the f.lux app.

Be sure to visit the official f.lux website for their own verbose tutorial for more information.

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  • Merman123

    How is it that their able to do that with a simple side load?

    • Kei_Oz

      My question as well. Could some JB tweaks be served by the sideloading method now?

      • Ethan Barker

        Don’t think so. Side loading apps means any app that is dis-approved by apple can be run on any device now. But change the gamma settings is something any app could do.

      • Matt

        No. Apple allows sideloading.

      • Michael Hulet

        Apple allows compiling apps and installing them on your device separate from the App Store, but that doesn’t necessarily mean they approve of it (such as using private IOKit symbols like f.lux does)

    • JayDee917

      Seriously, that’s interesting. Does this mean it might be possible one day to sideload Activator?

      • Yunik

        nope, that can’t happen (as far as i know about iOS). Your iOS device needs to have some sort of system access( something like that which can only be done by jailbreaking)

      • Ethan Barker

        Don’t think so. Side loading apps means any app that is dis-approved by apple can be run on any device now. But change the gamma settings is something any app could do. Activator needs the root access to work

      • bamboo7

        I thought everything is sandboxed. It’s change the setting for other apps like springboard.

      • Chris

        There are parts of iOS that provide access to features such as brightness and gamma. While they aren’t exactly common knowledge, it can be achieved.

        What the sandbox refers to is an app not being able to access and/or modify system level files and preferences.

      • bamboo7

        I guess I just assumed that this was a system wide preference. Good to know though, thanks for the clarification.

      • Michael Hulet

        f.lux leverages a private Apple framework that Apple uses internally, but doesn’t normally allow developers to use. However, with some tricks, normal 3rd party developers (like f.lux) can leverage it to make lower level changes that apply system-wide. It doesn’t violate the sandbox policy, but Apple doesn’t approve its use for the App Store

    • They use private APIs that are probably undocumented and certainly not meant for public use.

    • Mohammad Ridwan

      Private API.

  • nonchalont

    That’s awesome!

  • Dexter SherloConan

    already had Gamma Thingy

    • Yunik

      is gamma thingy working in your iphone? In my iphone 6+ it alway crashes

      • Dexter SherloConan

        Gamma Thingy version 1.0 works fine on my iPhone 6s, iOS 9.0.2

  • Mohammad Sajid

    could you share your wallpaper plz…..

  • Marcus

    I have two questions:
    1) Do I need a developer account for this?
    2) Is it possible for me to update this from my iOS device?

    • Yunik

      1. nope
      2. no your can’t.

    • Ethan Barker

      1) You might need a free one but don’t need to buy the paid one
      2) no

      • Anonymous

        So how do you update f.lux, through cydia it is. But how would you up date f.lux if the dev has a newer version?

      • bamboo7

        You just re-side load it.

      • George

        I’m a big fan anonymous

  • [RECON1]

    Yesss. Just finished side loading this on 9.2 beta

  • Shingo

    guys is flux really useful? recommended to use?

    • Morgan Freeman

      Once you try it, you’ll wonder how you ever lived without it. Blue tinted screens in the dark are horrible!

  • Kurt

    Yes! I had been using Goodnight for a while. Works well but I’ve always loved F.lux!

  • Alex

    I have to ask; what games are people playing, that would make the remote fly out of their hands?

  • Gil

    It does not damage the screen or something?

    • Morgan Freeman

      No. If you’ve ever played around with a computer monitor, you’ll notice they’ve had the ability to adjust the color temperature pretty much since they came to market decades ago.

  • :D

    I wonder if we can get a night mode app

  • Kurt

    After having this for the first sunset. I don’t like that you have to have the app open in order for it to work. I was using an app called Goodnight that I had side loaded previously and it did not have to be open to work. I will probably be going back to that unless F.lux is updated.

  • Apple asked the devs to pull the plug. Could some kind soul make the file available to download? Thanks.

  • Alex Ruski

    Has anyone saved the file? They were forced to shutdown the iphone app because of apple!

    • Bounding Hound

      I second this request!

  • imronburgundy

    Anyone got a mirror download link since they’ve taken this one down?