Apple today started testing iOS 27. 3, the biggest update to iOS 27 since it launched in September. iOS 27. 3 includes some features Apple showed off earlier this year, and it adds all-new capabilities. Subscribe to the MacRumors YouTube channel for more videos. Safari

Safari has a Vertical Tabs layout option that can be activated in Safari settings, along with an Adaptive Dark Mode for websites that don’t have a dark mode design option. Siri AI

Siri AI can do more in and across apps, with Apple adding a long list of new actions. In Mail, ‌Siri‌ can unsubscribe you from mailing lists and undo recently sent messages. In Weather, ‌Siri‌ can add locations to your weather list, or control weather notifications. In Safari, ‌Siri‌ can clear browsing history, manage tabs and windows, save articles to a Reading List, and close duplicate tabs. In Files, ‌Siri‌ can organize content, delete files you haven’t accessed for a set period of time, and more. There are new ‌Siri‌ actions across Calendar, Files, Journal, Mail, Maps, Messages, Music, Notes, Photos , Preview, Reminders, Safari, Shortcuts, and Weather. You can find out what’s new by asking ‌Siri‌ what it can do in each app. Apple is also expanding ‌Siri‌ AI to Traditional Chinese, Vietnamese, Turkish, and Norwegian, and adding a Developer Preview that lets any developer integrate their app with ‌Siri‌ AI. Any app can now bring its content and actions directly into ‌Siri‌ AI using App Intents. ‌Siri‌ AI can complete any custom actions developers implement, and there are skills available for teaching ‌Siri‌ AI to combine several actions into a single experience. New Health App

The redesigned Health app is back in iOS 27. 3. It has new Insights and Longevity tabs that show more information about your health and fitness metrics. The Insights tab includes your most recent health data, like Activity Rings, heart rate, sleep score, and vitals. Apple Intelligence will use that information to offer Personal Guidance. The Health app will be able to make suggestions based on your goals and what kinds of activities you do. The Health app’s Longevity tab looks at health data over time. It assesses you across seven categories: heart health, sleep, mental wellbeing, movement health, metabolic health, hearing, and nutrition. It also has a Health Age feature that uses info like resting heart rate, VO2 max, HRV, sleep, and biomarkers from blood work to calculate how your health metrics compare to your actual age. Health Age relies on health data collected from the Apple Watch, plus it incorporates fitness assessments you can take at home with tracking via the iPhone’s camera. iPhone Duo Reachability

Reachability is now available on the iPhone Duo . You can swipe left from the left edge or right from the right edge of the device’s outer display to bring content closer to where your thumb is for one-handed use. Reachability can be turned on in the Settings app by going to Accessibility, selecting Touch, and toggling on the option. iPhone Duo Keyboard

The keyboard on the ‌iPhone Duo‌’s front display has been tweaked. The emoji and number keys have been swapped, as have the microphone and return keys…