Apple has shipped the first beta of iOS 27.3, and Safari is the headline act. The browser is finally getting vertical tabs — a layout rivals have offered for years — along with an Adaptive Dark Mode that can render any website dark, not just those that support it natively. The Safari changes are reportedly coming to the browser across all of Apple's platforms, not just iPhone.

Beyond the browser, the beta restores the redesigned Apple Health app and includes improvements to Siri's AI capabilities, continuing Apple's incremental rollout of intelligence features through point releases rather than saving them for annual updates.

The pattern is familiar: Apple has increasingly used mid-cycle betas to land meaningful features, and 27.3 looks like one of the more substantial ones. Vertical tabs in particular address a long-standing power-user complaint, and a system-level dark mode for arbitrary sites removes one of the last reasons to reach for a third-party browser extension on the Mac — or a third-party browser entirely on iOS.

As with any first beta, features may shift before the public release, but the direction is set: Safari is catching up on quality-of-life features its competitors have treated as table stakes.