There's another app on the ad blocker scene — "NoAds - block ads on Wi-Fi networks in apps and browsers plus content blocker",
https://itunes.apple.com/app/noads-block-ads-on-wi-fi-networks/id882311006?mt=8.
It has actually been around before iOS 9, and was called "AdBlock for Wi-Fi" back then, allowing to block ads in most apps (Wi-Fi only, works via custom JavaScript URL that you paste into Wi-Fi network settings).
Now it has added Safari content blocker. Both features can be activated independently.
There are several predefined filters (Global, USA, Arab world, Bulgaria, China, Czech republic, France, Germany, Greece, Italy, Netherlands, Poland, Russia, South Korea), as well as custom whitelist and blacklist.
In my tests (Global + USA lists), many ads were blocked but most tracking scripts were let through. Perhaps regional filter lists are more effective in their respective regions.
However the ability to block ads in apps on Wi-Fi is quite an interesting feature. Despite the fact that it requires proxy settings, your whole traffic does not pass through a proxy. The decision what to block or not is made locally on your device, unblocked traffic is then sent normally and blocked is sent to a "dummy proxy" (usually Google's DNS servers that simply reject HTTP connections).
I use Weblock app that works similarly but is more customisable and allows to set a custom dummy proxy (localhost:8021 in my case, meaning that blocked traffic never leaves my device). NoAds lacks this feature, though, so 8.8.4.4:53 is used instead.
