Apple starts round four of its iOS 27, macOS 27 developer betas

Apple is moving on with its developer beta program, with new fourth builds of iOS 27, macOS 27, tvOS 27, watchOS 27, visionOS 27, and iPadOS 27 now undergoing testing.

The fourth round is here, and participants in Apple’s developer program can download the new builds to their devices right now.

The third developer builds arrived on July 6, while the second occurred on June 22 for most of the operating systems. The watchOS 27 counterparts landed later, on June 23 and June 25.

The first developer builds of iOS 27, iPadOS 27, macOS 27, tvOS 27, visionOS 27, and watchOS 27 were made available on June 8.

The fourth builds are:

• iOS 27 beta 4 is 24A5390f, replacing 24A5380h
• iPadOS 27 beta 4 is 24A5390f, replacing 24A5380h
• macOS 27 beta 4 is 26A5388g, replacing 26A5378j
• tvOS 27 beta 4 is 24J5325d, replacing 24J5315i
• watchOS 27 beta 4 is 24R5325h, replacing 24R5315i
• visionOS 27 beta 4 is 24M5326g, replacing 24M5316k

The initial changes included tweaks to Liquid Glass, the long-awaited overhaul of Siri, child-protective features, and many other smaller changes.

The second iOS 27 developer beta included an update to Apple TV in the Home app, showing it like a connected HomePod or HomePod mini. The Apple Wallet also added a new insights option, albeit in a non-functional fashion.

The third included some visual tweaks, with more customization options added for Siri AI on newer iPhone models.

At your own risk

While AppleInsider regularly warns readers that people trying out beta software should do so on secondary, spare hardware instead of their mission-critical or daily driver devices, it’s something that actually matters more this time around.

It’s because Apple’s early developer betas are for an operating system that is still under active development. There’s a higher chance of buggy, broken, and potentially harmful elements being distributed.

The initial builds are also intended to help developers learn about the operating system changes before the final public release later in 2026. It’s not meant to be used by consumers.

Unless you have a vested interest in using them, such as app development, don’t install the early developer betas.

Instead, members of the public should seek out the public betas, when they become available.

Find any changes in the new builds? Reach out to us on X at @AppleInsider or @Andrew_OSU, or send Andrew an email at [email protected].