Skip to main content
  1. Home
  2. Phones
  3. Apple
  4. Computing
  5. Mobile
  6. News

Apple bans F.lux screen brightness app for sideloading

Add as a preferred source on Google

Apple has changed its mind about the popular screen brightness management tool F.lux. Apparently, the company claims F.lux’s developers weren’t allowed to use Xcode or the iOS standard developer kit to sideload the app.

In case you’ve never heard of it, F.lux is a program for Windows, Mac, iPhone, iPad, and Linux that controls screen brightness and color, changing it gradually throughout the day. Enter what kind of lighting you have, and the program changes your screen to match the room. The app keeps you from being blinded in the morning or late night by your device’s bright screen. According to scientists, a dimmer screen emitting less blue light is better for your eyes — especially before bed.

Recommended Videos

In part because of its health benefits and all the recent news that warns against using devices before bed, F.lux has done really well. The desktop version has more than 15 million downloads, and the sideloaded iOS version was picking up steam — until Apple banned it.

“He kept repeating the party line that we should make apps that could use Public APIs.”

The sudden change caught F.lux developers off guard since the program has been widely popular and they haven’t had any complaints since Apple opened iPhones and iPads to apps outside the App Store months ago. In June, Apple changed its stance from previous years to allow users to sideload apps with its Xcode developer tool. The makers of F.lux took advantage of the new policy.

As Re/code has it, Michael Herf, one of F.lux’s founders, said, “The last six months of ‘sideload’ press – which Apple didn’t try to stop – had convinced us that Apple would be receptive to an approach like this.” Other than a little update from Apple in September, everything appeared to be fine as far as generally allowing sideloading — until now.

Suddenly, Apple seems “to disagree,” and has put the kibosh on F.lux, informing Michael that he and his team “were not authorized to use the iOS SDK or Xcode for the purpose we did,” Michael said, adding he was told that, “we could not distribute F.lux as we did.”

When Michael asked Richard Chipman, the Apple Rep about other cases that are similar to F.lux, he was evasive. “I asked him about open source used in a similar way, and he did not answer clearly, but he kept repeating the party line that we should make apps that could use Public APIs.”

By comparison, Android doesn’t require tools to sideload apps or have such strict developer limits on APIs. Why, then, does Apple? Some have suggested it’s because Apple doesn’t like anyone messing with the look of the iPhone beyond what it explicitly allows or that the limitations are intended to keep iOS secure.

Others suggest that Apple wants to take over F.lux’s game. The company cites research claiming the changes F.lux makes to your screen lighting are better for your health, and Apple is stepping further into the health tech arena. If Apple were including its own F.lux-like option in an upcoming iOS update — or as Erica Joy tweeted, a Night Mode — it wouldn’t want any competition. That way, Apple would no doubt boast about its revolutionary new screen tech, and thus removing F.lux from the picture.

Of course this is all speculation, at the moment. So far, Apple hasn’t commented on the situation.

Aliya Barnwell
Former Contributor
Aliya Tyus-Barnwell is a writer, cyclist and gamer with an interest in technology. Also a fantasy fan, she's had fiction…
Samsung’s next Galaxy Z foldables will give you plenty of AI love with Gemini Intelligence
Gemini Intelligence could let the Galaxy Z Fold 8 and Z Flip 8 handle multi-app chores from a single request
From mode from top on Samsung Galaxy Z Fold 7.

Samsung’s next Galaxy Z models are expected to put mobile AI to work in a more practical way. The Galaxy Z Fold 8 and Galaxy Z Flip 8, according to Seoul Economic Daily, will reportedly ship with One UI 9 and Google’s new Gemini Intelligence, giving the devices a deeper assistant layer than current Galaxy AI features.

Gemini Intelligence is being positioned as software that can move through related apps and complete linked tasks. In practice, that means a phone assistant that can follow a chain of actions across apps, rather than stopping after a single reply.

Read more
Samsung’s upcoming Galaxy Z Fold 8 Wide could break your heart with “modest” cameras
Leaked specs suggest the Fold 8 Wide's main camera won't quite match up to the standard Fold 8.
Samsung Galaxy Z Wide Fold

Samsung is preparing to shake up the foldable market this July with the rumored Galaxy Z Fold 8 Wide, a new extra-wide variant of its flagship foldable expected to launch alongside the standard Galaxy Z Fold 8. But if you were hoping for top-tier camera specs on the wide foldable, you may want to temper your expectations.

No Ultra-tier main camera

Read more
Amazon says it isn’t making another phone, after burning itself with the Fire Phone
Amazon remembers the Fire Phone, and it isn’t rushing back
Amazon Fire Phone

Amazon's Fire Phone was a spectacular failure that marred the e-commerce giant's hardware attempt. More than a decade later, Amazon appears to be eyeing the mobile segment again with an AI twist. But it may not be preparing a straightforward smartphone sequel.

In a Financial Times interview, Amazon devices chief Panos Panay says that the company has no plans to simply try to build another phone. Panay said Amazon is "not necessarily going after phone," while acknowledging that mobile technology is changing and that new AI-powered form factors could blur the usual lines around what counts as a phone.

Read more