Apple's iOS 9.3 beta Night Shift feature draws rave reviews on Twitter

The beta release of Apple's (NASDAQ: AAPL) upcoming iOS 9.3 update is making the rounds and reactions have ranged from glowing praise to dire warnings.

So far Night Shift, a feature that reduced the amount of blue light in the display during the evening, is getting a lot of the early applause. Using the iPhone's clock and geolocation, Night Shift automatically shifts to warmer colors after the sun goes down in order to make it easy on eyes and lessen the chance of disrupting sleep.

The feature is already drawing a lot of comparisons to f.lux, an app developed in 2009 that serves pretty much the same function.

It's a fact that hasn't gone unnoticed by f.lux, which issued a reasoned blog post asking Apple to let the f.lux app be released for iOS and for access to the new Night Shift features baked into iOS.