Apple has released iOS 27, iPadOS 27, tvOS 27, and macOS 27 Public Beta 4, one week after Public Beta 3 and just hours after seeding Developer Beta 6 to testers. The fourth public iteration across all five major operating systems focuses on bug fixes and performance improvements as the official September release approaches.
What’s New in This Beta Round
The update introduces modest refinements across Apple’s operating systems. iOS 27 gains a new Shortcuts splash screen and a redesigned Game Center icon, while macOS 27 adds fresh wallpapers and redesigned stoplight window controls (the red, yellow, and green buttons in the top-left corner of windows).
Performance improvements span multiple categories – app launches are seemingly faster, AirDrop transfers are significantly quicker, and keyboard responsiveness has improved. These refinements reflect Apple’s focus on stability as release approaches.
Build Numbers and Platform Updates
iOS 27 Public Beta 4 carries build 24A5418b, matching the build number for iPadOS 27 Public Beta 4. TvOS 27 Public Beta 4 received build 24J5353b, while macOS 27 Public Beta 4 is version 26A5416b. Apple re-released the macOS build at 9:15 p.m.
Key Features in iOS 27
iOS 27 introduces several capabilities launching alongside the new iPhone lineup. Siri AI, Apple’s more capable version of Siri, can search the web, access personal information, see what’s on your screen, and take actions across apps. It functions more similarly to Claude or ChatGPT than the current Siri, with a dedicated app for back-and-forth conversations. The Home app now supports 4K video cameras, AirPods gain custom EQ options, and new child safety controls give parents better oversight.
Siri AI and Apple Intelligence features require an iPhone 15 Pro or later. On-device processing for improved dictation and customizable Siri voices require an iPhone 17 Pro or iPhone Air.
How to Install Public Beta 4
Enrollment requires signing up on Apple’s beta website, then opting into the public beta by opening Settings, selecting General, and choosing Software Update. Apple recommends installing beta software on a secondary device. If using a primary device, ensure a recent backup exists first.
The accelerated schedule, now at Developer Beta 6 and Public Beta 4, signals Apple is finalizing all operating systems for their September launch, likely timed to the iPhone announcement. Weekly releases across both tracks suggest the operating systems are weeks away from release.
