Just bought and tried (in this order): Crystal, Purify and Peace. Each has features to like. Crystal has a great price and is the only one to let you report an ad not blocked or broken page so that the ad block list can be updated. Purify lets you block scripts and images on top of font-blocking options also in Peace. Crystal missed an ad that Purify (and Peace) caught, but Peace was the only one that seriously remov…
I don't know how much work has gone into making these content blocker apps, but I bet it has taken some time - time that in any "normal" business would be charged for, and I think mobile apps creators should charge more for their apps too. In my experience, there are two types of mobile apps consumers. Those that won't pay for an app, whether it costs $1, $10 or $20, and those that will, and I think it would be healthier for the ecosystem to cater at least as much to the latter group as the former, but I don't think that's currently the case.
It's a race to the bottom, folks.