Beta: test version

iOS 27.3

iOS 27.3 is in testing. Its headline change is the redesigned Health app, which was pulled from iOS 27.2 late in testing and is now back. It also adds Safari vertical tabs, more Siri AI languages and more things Siri can do inside Apple's own apps.

StatusBetaBefore the end of 2026 (Apple, for the new Health app); December 2026 (reported)
Build24C5037i (beta 1)
Changes10
Works on: iPhone 11 and later, the same iPhones as iOS 27. Siri AI features need an iPhone 15 Pro, iPhone 15 Pro Max or any iPhone 16 or later.

Release timeline

  1. Developer beta 1Build 24C5037i

    First 27.3 beta. The redesigned Health app returns. Also adds Safari vertical tabs, more Siri AI languages and app actions, new StandBy clock faces and Reachability on iPhone Duo.

  2. Public beta 1Build 24C5037i (reported)

    The same software opened to Apple Beta Software Program members two days after the developer release (reported).

What's new, feature by feature

Health
Redesigned Health appIn beta

The Health app gets a new layout with Insights, Longevity and Browse tabs, plus a Health Age score built from in-app checks of things like balance, strength and flexibility (reported, from the 27.2 betas).

Why it matters: Makes your health data easier to understand at a glance instead of digging through lists of numbers.

First in: Developer beta 1

Safari
Vertical tabs in SafariIn beta

An option to show your open tabs in a sidebar down the left side of the screen (reported).

Why it matters: Helps people who keep many tabs open find the one they want faster.

First in: Developer beta 1

Safari
Adaptive dark mode in SafariIn beta

Safari can adapt websites to a darker look to match dark mode (reported).

Why it matters: Easier on the eyes when reading at night.

First in: Developer beta 1

Siri
Siri AI in four more languagesIn beta

Siri AI testing adds Traditional Chinese, Vietnamese, Turkish and Norwegian (reported).

Why it matters: Brings the new Siri to more people who don't use it in English.

First in: Developer beta 1Needs iPhone 15 Pro or iPhone 16 and later

Siri
More Siri actions in Apple appsIn beta

Siri AI can do more inside apps such as Calendar, Journal, Messages and Music, and you can ask it what it is able to do in a supported app (reported).

Why it matters: Lets you get tasks done by voice without tapping through menus.

First in: Developer beta 1Needs iPhone 15 Pro or iPhone 16 and later

System
New StandBy clock facesIn beta

StandBy on regular iPhones gains more digital and analog clock faces, with colours, complications and several setups you can swipe between (reported).

Why it matters: Gives a charging iPhone on a nightstand or desk a more useful, personal display.

First in: Developer beta 1

Accessibility
Reachability on iPhone DuoIn beta

Shifts content toward the left or right edge of the wide unfolded screen so it is easier to reach with one hand (reported).

Why it matters: Helps iPhone Duo owners use the big screen one-handed.

First in: Developer beta 1Needs iPhone Duo

Apple Watch
Apple Watch Audio IntelligenceIn beta

Live Rewind and Siri Recap arrive in the matching watchOS 27.3 beta, paired with iOS 27.3 (reported).

Why it matters: Gives Apple Watch owners new ways to catch up on audio they missed.

First in: Developer beta 1Needs Apple Watch Series 12 or Ultra 4 (reported)

Fitness
Fitness+ Gym Strength workoutsIn beta

Apple Fitness+ adds a set of strength workouts designed for the gym (reported).

Why it matters: Useful for subscribers who train with gym equipment.

First in: Developer beta 1

Apple Intelligence
Apple Intelligence in ChinaIn beta

Some Apple Intelligence features start rolling into the Chinese market, though Siri AI is still not available there (reported).

Why it matters: Opens Apple's AI tools to iPhone owners in mainland China for the first time.

First in: Developer beta 1Needs iPhone 15 Pro or iPhone 16 and later

Security

Beta software; Apple publishes security notes only when the final version ships.

← iOS 27.2.1All iOS versions
Sources