Content Blockers

Content blockers use Safari's content blocking API, which takes a JSON rule list and applies it without the extension seeing your browsing. Hush hides cookie banners and similar noise, wBlock is a general ad and tracker blocker, and AdGuard combines ad blocking with anti-tracking. Blahker targets interstitial ads on Taiwanese websites. Most of these have App Store links.

BlockParty and Adblock Fast are smaller Objective-C projects that show the basic structure of a blocker. PIA VPN is also listed here. Firefox Focus and Adblock Plus are marked as unmaintained in this list. If you want to build your own, look at how each project compiles filter lists into Safari's rule format and stays under the rule limit.