iOS 12 and tvOS 12, which were demonstrated at WWDC and immediately rolled out in developer beta versions, were made available as public betas on 25 June, and have now been joined by macOS Mojave. Anyone can now sign up for the programme and install iOS 12 on a compatible iPhone, iPad or iPod touch, Mojave on a compatible Mac, and tvOS 12 on a compatible Apple TV.
All three OS updates bring a raft of new features, but readers should be warned that betas are unfinished pre-release software and may contain bugs. Most of these will have been removed by the time Mojave, iOS 12 and tvOS 12 officially launch in the autumn.
When will Apple release a public beta of watchOS 5?
watchOS 5, Apple's other new operating system, is just for developers right now, and it's likely to stay that way until the official launch. Apple has never previously offered a public beta for watchOS.
How to install the public betas
It's reasonably straightforward to install the public betas of iOS 12 and tvOS 12. You just need to sign up for the programme first.
And here's how to install the tvOS 12 beta.
Finally, our Mojave beta installation guide explains how to install the new public beta of macOS Mojave.