−10% 
−40%
Prices and availability are accurate as of the date shown and are subject to change. The price and availability displayed on Amazon at the time of purchase will apply.
| iPhone 18 Pro Max | iPhone Duo | |
|---|---|---|
| Starting price | $1,299 (256GB) | $1,999 (256GB) |
| Top price | $2,499 (2TB) | $3,199 (2TB) |
| Screen | 6.9" | 5.4" outer + 7.6" folding inner |
| Colors | Four, including burgundy | Night Sky, Star White |
| Headline feature | Variable-aperture 48MP main camera | Largest iPhone display ever |
| Battery | Apple: longest battery life in an iPhone | Not Apple's headline claim |
| Ships | September 18 | October 23 |
| Case choice today | Wide (TORRAS, Spigen and more) | Limited |
Best case for it: TORRAS Q3 Air 360 Magnetic Stand Case, $59.39. It’s slim and light and has a built-in 360° stand. Premium alternative: TORRAS Ostand Hue, $49.99, with an aluminum stand.
Best case for it: FNTCASE Matte Case + Screen Protector, $14.99, with a case and outer-screen glass in one box.
Apple’s magnetic charger works on either phone. Charge the Duo folded.
It holds enough to recharge either phone several times, and the 140W output can also charge a laptop. The smart display shows exactly how much power is left.
For most people, the iPhone 18 Pro Max is the better buy: it’s cheaper, it ships sooner, it has the better camera and battery, and it’s easier to protect. The iPhone Duo is the exciting one, and worth it if the big folding screen will change how you use your phone every day.
The iPhone Duo starts at $1,999, $700 more than the 18 Pro Max at $1,299.
No. The Duo folds and needs a two-piece case made for it.
Apple's "longest battery life in an iPhone" claim is for the iPhone 18 Pro lineup.
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Prices, ratings and rating counts were taken from Amazon.com on 12 September 2026 and are shown in USD before tax and shipping. Amazon rating counts may pool multiple product variants. Discounts are calculated against Amazon’s stated list or typical price and are not independently verified historical lows.
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