Earlier quoted context omitted.
This has never happened.
Not explicitly (because that might be too openly anti-competitive even for Apple) but Apple refused to allow f.lux into the App Store, and it had to be sideloaded - and Apple leaned on them to stop offering that. When Apple did offer Night Shift in iOS 9.3 it made the APIs to do this Apple-only, for ... reasons. As of today, no non-Apple app can modify color temperature of the display.
The actual reason behind F.lux for iOS being pulled - https://www.reddit.com/r/apple/comments/3smf15/the_actual_re...
> Sure, it uses private APIs, but thousands of popular projects on Github (like game simulators) or that Apple TV web browser project all use private APIs and they are just fine.
> The issue is F.lux for iOS is not a true source-available download. It includes a full app bundle with pre-compiled binary (which in a nutshell, is an extracted .IPA file) packed within Xcode to utilize Apple's new free signing policy.
> And to making things worse, the same F.lux Xcode project does not only allow side loading F.lux itself, but also any unsigned IPA file. The only thing a user needs is to extract an unsigned IPA and drag all resources into the project. This allows pirates to install any stolen app, without the need to buy a developer certificate. I have tested and believe this is the true reason for F.lux project being pulled.