(Image credit: Majin Bu on X)

This September, Apple looks set to introduce a brand new flagship iPhone to the world. Previously dubbed the iPhone Fold as a placeholder name, people have coalesced around iPhone Ultra as likely branding for Apple’s most expensive handset to date.But that high price of entry doesn’t make it unambiguously the best iPhone you can buy, and the iPhone 18 Pro Max will have plenty going for it. Here are five key differences between the two handsets ahead of their September launch.iPhone Ultra vs iPhone 18 Pro Max: Form factor

(Image credit: Subsy @ MakerWorld)The iPhone Ultra will be Apple’s first foldable device, making it quite a change from the iPhones that have gone before it.For its debut foldable, Apple looks to offer a similar design to handsets like the Samsung Galaxy Z Fold 7 and OnePlus Open. That is to say, a regular-looking smartphone that opens up to reveal an iPad mini-sized canvas on the inside, to aid productivity and improve media consumption.Apple is said to be making changes in iOS 27 to compensate for this, with iPad-like app layouts and side-by-side apps for multitasking. Naturally, this will be exclusive to the iPhone Ultra.The iPhone 18 Pro Max, meanwhile, will be far more like its predecessors: a single 6.8-inch screen for a traditional iPhone experience.iPhone Ultra vs iPhone 18 Pro Max: Camera performance