Apple Adds Vertical Tabs and Adaptive Dark Mode to Safari in iOS 27.3
Apple has released the first developer betas of iOS 27.3, iPadOS 27.3, and macOS 27.3, introducing vertical tabs and adaptive dark mode to Safari. The vertical layout, positioned on the left, optimizes screen space for larger displays like the iPhone Duo. Adaptive dark mode automatically adjusts non-compliant websites for readability. These updates aim to modernize Safari’s interface across Apple’s ecosystem.
Key points
- Apple released the first developer betas of iOS 27.3, iPadOS 27.3, and macOS 27.3, introducing significant interface updates to the Safari browser.
- Safari now supports a vertical tab layout positioned on the left side of the screen, featuring space-saving icons and resizable bars for website titles.
- The update includes Adaptive Dark Mode, which automatically renders dark themes for websites that lack native support, improving contrast and readability.
- Vertical tabs are accessible via Safari settings on iOS and iPadOS, or the View menu on Mac, catering to users of devices like the iPhone Duo.
- The feature mirrors trends popularized by competitors like Microsoft Edge and Arc, with Arc ceasing development in December 2026.
Safari Interface Overhaul in iOS 27.3
Apple has released the first developer betas for iOS 27.3, iPadOS 27.3, and macOS 27.3, marking a significant update to the Safari browser. The release introduces two major interface enhancements: a vertical tab layout and adaptive dark mode. These features are designed to improve usability and visual comfort across Apple’s ecosystem, including the iPhone, iPad, and Mac. The updates are currently available in beta and are expected to refine the browsing experience for Apple’s 2.5 billion customers.
Vertical Tabs and Screen Optimization
The most prominent change in Safari is the introduction of vertical tabs. Previously limited to horizontal arrangements at the top of the browser window, tabs can now be displayed vertically along the left side of the display. This layout is particularly beneficial for devices with larger screens, such as the iPhone Duo, but is available across all supported platforms. By default, vertical tabs appear as icons to maximize both vertical and horizontal screen space. Users can hover over these icons to preview the corresponding browser window without switching tabs.
The vertical tab bar is resizable, allowing users to expand it to display full website titles. This feature integrates seamlessly with existing organizational tools, including Apple Intelligence tab sorting, Topics, and Tab Groups. Pinning tabs and quickly swapping between groups remain functional within the new layout. Users can enable vertical tabs through the Settings app under Apps and Safari on iOS and iPadOS. On Mac and iPad, the option is accessible via the View menu within the Safari application.
Adaptive Dark Mode for Web Readability
Safari 27.3 also introduces Adaptive Dark Mode, a feature that automatically applies dark themes to websites that do not natively support dark mode design. When a user with Dark Mode enabled visits a bright-background website, Safari offers a "Try" option to activate the adaptation. Once enabled, the browser renders a dark version of the page by darkening backgrounds, adjusting text contrast, inverting logos and graphics, and recoloring vector artwork. The system also lifts raised surfaces and rebalances layered shadows to maintain visual hierarchy. Each website is adapted individually based on its specific design requirements to ensure readability.
Market Context and Competitor Landscape
The addition of vertical tabs aligns Safari with trends popularized by competitors. Microsoft Edge introduced vertical tabs years ago, and Chrome recently added similar functionality. Arc, a browser developed by The Browser Company, also gained popularity for its vertical tab interface. However, The Browser Company announced in late 2026 that it will discontinue Arc in December, citing shifts in development strategy. Apple’s move to integrate vertical tabs ensures Safari remains competitive in the global web browser market, where it holds a dominant position among Apple device users despite lagging behind Chrome in overall market share.
Additional Features and Future Implications
Beyond vertical tabs and adaptive dark mode, the iOS 27.3 beta includes Siri AI Custom Actions and Audio Intelligence capabilities. These additions suggest Apple is continuing to integrate artificial intelligence into core browsing functions. The release of developer betas allows for early testing and feedback before a public rollout. As Safari evolves, these updates aim to enhance user productivity and visual comfort, addressing long-standing requests for more flexible tab management and better dark mode support.
Key takeaways
- Apple released iOS 27.3, iPadOS 27.3, and macOS 27.3 developer betas with major Safari updates.
- Vertical tabs are now available on the left side of the screen, featuring icons and resizable title bars.
- Adaptive Dark Mode automatically adjusts non-compliant websites for better readability and contrast.
- The features are accessible via Settings on iOS/iPadOS and the View menu on Mac.
- Vertical tabs align Safari with competitors like Edge and Chrome, following Arc's discontinuation.
- The update includes additional AI features like Siri Custom Actions and Audio Intelligence.
Sources
The WireByte editorial team synthesises technology news from multiple primary sources, verifies the facts, and links every source. Articles are produced with AI assistance and reviewed under our editorial policy.
