Apple is forcing third-party web browser apps to use Apple's WebKit as their rendering engine. For that reason, third-party browser applications such as Chrome for iOS also use WebKit, but ...

Codenamed SquirrelFish, WebKit’s new interpreter is a whopping 60% faster than its predecessor as displayed by the graph above showing the results of SunSpider JavaScript benchmark tests.

Mozilla is working on a non-WebKit version of Firefox for iOS in anticipation of changes to Apple's platform rules, The Register reports. ...

Google's Chromium team is working on making a new experimental browser for iOS based on Blink, instead of using Webkit as mandated by App Store policies.

Apple has previously stated that the WebKit requirement is enforced primarily due to security and privacy considerations, but some find the policy anti-competitive.