Update, August 18, 1:06 p.m. ET: Apple has now published watchOS 27 Public Beta 4 (Build: 24R5353a). The original story follows below

After releasing developer betas 6 earlier today, Apple is now rolling out iOS 27 public beta 4, alongside corresponding updates for some of its other platforms. Here are the details.

Apple just rolled out:

• iOS 27 Public Beta 4: Build 24A5418b
• iPadOS 27 Public Beta 4: Build 24A5418b
• tvOS 27 Public Beta 27: Build 24J5353b
• macOS 27 Public Beta 4: Build 26A5416b (Apple had previously released a build with code 26A5416a)
• Update, August 18: watchOS 27 Public Beta 4: Build 24R5353a

The release comes just hours after the company rolled out their corresponding beta 6 versions, introducing bug fixes and performance improvements as Apple fast approaches the official release date of these systems in a few weeks.

Today’s macOS 27 beta introduces a new wallpaper, alongside redesigned stoplight window controls for macOS 27 Golden Gate. Other notable changes include:

• Pinned Messages user interface bug from beta 5 appears to be resolved in beta 6.
• Updated iOS notification animation
• Updated Preview icon on the Mac, matching iOS version from last week

The build number for each public beta is the same as that of its corresponding developer beta 6, except for macOS, which had build 26A5416b. Update, 9:15 p.m: Apple has now re-released the macOS 27 public beta 4, with build 26A5416b.

To enroll your device in the Public Beta program, visit https://beta.apple.com, and follow the steps for each corresponding device. Here is how to install the public beta on the iPhone:

1. Visit the Apple Beta Software Program website and choose Sign Up or Sign In.
2. Sign in with the same Apple Account you use on your iPhone. Then accept the program terms and enroll your account.
3. Open Settings on your iPhone.
4. Go to General > Software Update > Beta Updates.
5. Select iOS 27 Public Beta.
6. Return to the Software Update screen, then tap Update Now when the beta appears.

Apple recommends installing beta software on a secondary device. If you use your primary iPhone, make sure you have a recent backup first.

Did you spot any changes in today’s betas? Let us know in the comments.

• Geoffrey Cain – ‘Steve Jobs in Exile’
• David Pogue – ’Apple: The First 50 Years’
• MacBook Neo
• Logitech MX Master 4
• AirPods Pro 3
• AirTag (2nd Generation) – 4 Pack
• Apple Watch Series 11
• Wireless CarPlay adapter