In June, it was revealed that Safari in iOS9 would support ad blocking. Last week, ad blocking on iOS became a reality.

This week, the iOS ad blocking apocalypse is in full swing and the victims aren't just companies that rely on digital advertising to generate revenue.

As detailed by Fortune, the most popular iOS ad blocker, Crystal, is currently preventing a number of high-profile ecommerce sites from rendering. Retailers affected include Walmart, Sears, Walgreens and Lululemon.

Last Cyber Monday 78% of mobile shopping took place on iOS devices and according to Chris Mason the CEO of Branding Brand the implications of ad blocking could be significant this holiday shopping season...

First, the experience for customers will be lessened. Lots of sites will be missing content, have broken links or customers won’t be able to add certain items to their shopping carts. They’ll probably just think the site is broken, but it’s really their content blocker. Second, retailers will be data-blind, or at least data-dark. It will really impact their ability to make quick judgments.

The magnitude of the problem can be significant. In Fortune's tests, pages on and literally went blank with Crystal installed. Other websites, like, appeared functional, but Crystal prevented users from actually adding products to cart, a big problem to say the least.

Crystal's creator, Dan Murphy, is making changes as the problems associated with his app make headlines, but even after he said he had addressed issues affecting certain retailer sites, Fortune encountered new problems with some of them. 

99 problems, but an ad blocker isn't one?

Even websites that remain fully functional from an end user perspective don't necessarily escape unscathed. As Fortune's Dan Primack notes,

Even for mobile websites that are working properly from a customer perspective, such ad-blocking technology also can strip out back-end code like Google Analytics or Adobe’s Omniture, which provide retailers with real-time insights into customer behavior. And then there is the whole matter of how retailers generate around 60% of their mobile web traffic inorganically, via online ads that Crystal and other ad-blockers are designed to eliminate.

Put simply, lots and lots of companies are going to be impacted in some way by ad blocking in Safari on iOS. So how can they deal with it? Unfortunately, it's complicated.

In some cases, the most reliable workaround is to ditch certain third-party services that ad blockers frequently target, but doing this can often be technically complex or costly to do. Another approach that might be viable for larger companies is to reach out to the creators of popular ad blockers directly.

A new testing paradigm

Ultimately, it appears that just as companies that are serious about the web have learned to do thorough cross-browser and cross-device testing to ensure that their experiences work everywhere, companies may be forced to do thorough testing of their websites using ad blockers. 

Right now, ad blockers represent some of the most popular iOS apps in the App Store and combined have been downloaded more than 500,000 times in the first week. Popular choices include Crystal, Purify, Blockr and Weblock.

Companies interested in determining the impact of ad blockers on their mobile sites will want to test their mobile sites using most or all of these apps. They'll also want to monitor as they are updated, and new apps gain in popularity.

No turning back

Despite the chaos created by Safari's new support for ad blocking, companies shouldn't expect Apple to reverse course. Consumer distaste for online ads has reached a boiling point and Apple isn't going lose any consumer friends helping iOS users block ads on their tablets and mobile phones.

As for enemies, as some have noted, one of Apple's arch rivals, Google, derives most of its revenue from online ads, giving Apple another incentive for facilitating ad blocking on its devices.

Unfortunately, there is collateral damage here and all companies active on the mobile web will need to learn to live in a world where iOS users have ad blockers. 

Patricio Robles

Published 28 September, 2015 by Patricio Robles

Patricio Robles is a tech reporter at Econsultancy. Follow him on Twitter.

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Comments (4)

Landon Donovan

Landon Donovan, Digital Marketing Consultant at Picreel

Hello Patricio,

Very informative article. Thank you.

I assume it is a problem that is more related to or initiated by the ad blocker like Crystal, as you mentioned. If Crystal or any other ad blocker is blocking unwanted pages as well despite of just blocking ads or if it is not allowing users to add products to cart, this is potentially a fault in the ad blocker.

These ad blockers should be scrutinized before they are published on the stores for download. Anything that’s buggy and not coded rightly will definitely going to create issues. In fact, at Picreel ( we have developed a software that shows popups and overlays on websites. Luckily, we don’t get complaints that it is blocked by some tools or plug-ins. Yeeey!

Thank you once again for a nice article.

almost 3 years ago

Pete Austin

Pete Austin, Founder and Author at Fresh Relevance

Gruber thinks it will not be so very bad in iOS. "Eight months from now, our hypothetical publisher could see a 3.7% drop in ad revenue".

This will be fascinating to watch. If it does get bad, I expect to see marketing walls on free sites to deny content to visitors who have turned marketing off, but we won't really know the impact until after Christmas.

almost 3 years ago


Dave Harris, Job Title at SMD

Hello Landon, thanks for telling me about your service. I've added it to my ad blocker rules and I'm sure others will follow. Putting a huge red modal over THE WHOLE PAGE is a horrible idea and the ad blockers exist to weed out services like yours.

almost 3 years ago


Dave Harris, Job Title at SMD

There's another reason people block ads, and it's very real:

Before chiming in promoting an ad product and code reviews the ad industry should take a good look at itself to see how it can clean up its act. Maybe then people would whitelist them - for example, like The Deck network.

almost 3 years ago

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