Ad blockers in iOS 9 have developers surprised and thrilled on Twitter

The news came out as Apple's WWDC 2015 was coming to an end, but the company's decision to allow ad blockers on Safari may have gotten the most developer applause, based on their Twitter comments.

Apple said the features will be baked into both the iOS 9 and the Mac OS X El Capitan versions of its platform and will apply to cookies, images, other resources, pop-ups and other content.

App developers sounded upbeat about the move on social media: 

Of course, given its own iAd business, some were taken off-guard:

To some extent, offering ad blocks could be a way for some developers to get more business, offering an alternative revenue stream:

Overall, developers suggested that Apple was working hard to remain the top mobile platform in the industry: