Apple has released iOS 27 Public Beta 4 (Build 24A5418b) alongside corresponding updates for macOS 27, iPadOS 27, and tvOS 27. The release follows closely behind developer beta 6 versions, bringing bug fixes and performance improvements as the official launch approaches. Notably, macOS 27 Public Beta 4 introduces a new wallpaper and redesigned stoplight window controls for macOS 27 Golden Gate.

Additional changes include resolved Pinned Messages UI bugs, updated iOS notification animations, and a refreshed Preview icon on Mac. Apple also published watchOS 27 Public Beta 4 (Build 24R5353a). Users interested in testing these betas can enroll through the Apple Beta Software Program website, though Apple recommends installing beta software on secondary devices or ensuring recent backups on primary devices.