The iPhone Duo is far more versatile than the iPhone Air thanks to its second, tablet-sized screen. But it's also heavier and much more expensive.

The iPhone Air is slim, stylish, lightweight, and a much cheaper option than the iPhone Duo, but it can't match Apple's foldable for photography or versatility.

The iPhone Duo and iPhone Air are both oddities in Apple’s current smartphone lineup. There’s only one of each, and they meet fundamentally different user needs.

Sure, they're both extremely sleek and slim (assuming we’re talking about the iPhone Duo in its unfolded form), and they share some other similarities. But for the most part, these two iPhones couldn't be more distinct.

In this article, then, we’ve compared the iPhone Duo and iPhone Duo in full, to help you decide which model is right for you.

The chart below shows the core specs of both handsets, so you can see at a glance how they compare.

117.8 x 84.1 x 11.3mm (folded) / 117.8 x 164.6 x 5.2mm (unfolded)

7.6-inch Super Retina XDR OLED (foldable) / 5.4-inch Super Retina XDR OLED (cover)

The iPhone Duo was announced in September 2026 and began shipping in October, with the phone now widely available globally.

The iPhone Air is a bit older, having launched back in September 2025, but with no successor yet available, you can still buy it.

The Duo comes in four configurations, with the cheapest being a 256GB option for $1,999 / £1,999 / AU$3,499. Next up, there’s a 512GB version for $2,199 / £2,199 / AU$3,899, with a 1TB model costing $2,599 / £2,599 / AU$4,699, and a 2TB configuration coming in at $3,199 / £3,199 / AU$5,899.

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