WebShield

To set a baseline: Ad blockers work by a combination of static rulesets and dynamic javascript. Safari does not support the ruleset format of Chrome/Firefox, so a ruleset has to be maintained for it specifically. In practice this is always the AdGuard ruleset. I doubt a single adblocker doesn't use this as a base. Beyond that is the custom JS they inject. It's hard to say how good it is but that is the only selling point: - https://github.com/arjpar/WebShield/tree/cae7629f1c5fb79fe76... AdGuard has its own too: - https://github.com/AdguardTeam/AdGuardForSafari/tree/master/... (JS files) They look similar in a lot of ways, because well they have to, but I haven't done any deep analysis. Safari extensions will never match uBlock Origin because it simply does not provide the same APIs (webRequest blocking and DNS) that Firefox does. The rule