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Safari 27.3 Beta Introduces Vertical Tabs and Adaptive Dark Mode Features

Safari 27.3 Beta Introduces Vertical Tabs and Adaptive Dark Mode Features

First seen 3 Nov 2026, 19:49 UTC • •
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ThreatCluster AI
ThreatCluster •November 3, 2026 at 22:46 UTC
  • •Safari 27.3 introduces Vertical Tabs for better tab management.
  • •Adaptive Dark Mode enhances readability by adjusting website backgrounds.
  • •Siri AI can manage tabs and web history with voice commands.

Apple has released the developer beta for Safari 27.3, introducing significant updates including Vertical Tabs, Adaptive Dark Mode, and enhanced Siri AI functionalities. Vertical Tabs allow users to organize tabs on the left side of the browser, available on macOS, iPadOS, and iOS. Adaptive Dark Mode intelligently adjusts website backgrounds for better readability in low-light conditions. Siri AI can now manage tabs and web history through voice commands, with future updates promising deeper understanding of webpage content. These features are currently in beta testing and will be available to the public in December 2026. The updates aim to improve user experience across Apple devices, especially for power users.

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Timeline

2026-11-03
Safari 27.3 Beta released
Apple launched the developer beta for Safari 27.3, featuring Vertical Tabs and Adaptive Dark Mode.
Gizmodo
2026-11-03
Siri AI functionalities announced
New Siri AI features allow users to manage tabs and web history through voice commands, enhancing usability.
Daringfireball

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Common questions

What devices support the new features?
The new features are available on macOS, iPadOS, and iOS devices, but not on regular iPhones.
When will these features be publicly available?
The updates are expected to launch in December 2026 after beta testing.
How can I enable Vertical Tabs in Safari?
Users can enable Vertical Tabs through the Safari settings or the View menu on Mac and iPad.