Add blocking is something Safari (and Apple) does better than the any other browser vendor, IMO. A good ad blocker for Safari (on Mac or iOS) just uses the Con

Add blocking is something Safari (and Apple) does better than the any other browser vendor, IMO. A good ad blocker for Safari (on Mac or iOS) just uses the Content Blockers system, and provides essentially a JSON blob with a bunch of rules in it to Webkit, which will then take the requested actions (mostly block, sometimes hide elements, sometimes force a URL to https) internally - the Ad Blocker "app" never knows what sites you're visiting and is never involved in actual blocking.