iPhone 18 Pro Max vs iPhone Duo (unfolded)
86.6 mm wider, 45.6 mm shorter and 5 g heavier.
Quick answer
iPhone 18 Pro Max uses a standard form factor measuring 78 mm wide, 163.4 mm tall, and 8.75 mm deep, fitting into a men's median jeans pocket. iPhone Duo (unfolded) opens to a 164.6 mm width and 117.8 mm height, preventing pocket carry in men's or women's median jeans pockets and requiring two hands for operation. While iPhone Duo (unfolded) is thinner at 5.2 mm, iPhone Duo (unfolded) weighs 254 g, which is 5 g heavier than the 249 g iPhone 18 Pro Max. For reading and multitasking, iPhone Duo (unfolded) offers a 7.6-inch screen, whereas iPhone 18 Pro Max has a 6.9-inch screen. iPhone 18 Pro Max provides 45 hours of video playback compared to 31 hours on iPhone Duo (unfolded).
- iPhone Duo (unfolded) requires two hands to hold securely across a 164.6 mm width.
- iPhone 18 Pro Max fits in men's median jeans pockets, while iPhone Duo (unfolded) cannot.
- iPhone Duo (unfolded) provides a 7.6-inch reading surface at 254 g of weight.
- iPhone 18 Pro Max delivers 45 hours of video playback versus 31 hours on iPhone Duo (unfolded).
TRUE SCALE · 1.2 PX/MM
TRUE SCALE · 2.1 PX/MM
Hand: US Army ANSUR II, 2012 (sex-balanced median). Pockets: The Pudding, 2018. Card: ISO/IEC 7810 ID-1.
iPhone 18 Pro Max: 163.4 by 78 by 8.75 millimetres, 249 grams. iPhone Duo (unfolded): 117.8 by 164.6 by 5.2 millimetres, 254 grams.
18 Pro Max, Duo open shown at 2.1 pixels per millimetre.
Height: 18 Pro Max 163.4 millimetres, Duo open 117.8 millimetres.Height: 18 Pro Max 6.43 inches, Duo open 4.64 inches.Width: 18 Pro Max 78.0 millimetres, Duo open 164.6 millimetres.Width: 18 Pro Max 3.07 inches, Duo open 6.48 inches.Depth: 18 Pro Max 8.75 millimetres, Duo open 5.20 millimetres.Depth: 18 Pro Max 0.34 inches, Duo open 0.20 inches.Weight: 18 Pro Max 249 grams, Duo open 254 grams.Weight: 18 Pro Max 8.78 ounces, Duo open 8.96 ounces.
Specifications
| Specification | 18 Pro Max | Duo open |
|---|---|---|
| Height | 163.4 millimetres6.43 inches | 117.8 millimetres, 45.6 millimetres less4.64 inches, 1.80 inches less |
| Width | 78.0 millimetres3.07 inches | 164.6 millimetres, 86.6 millimetres more6.48 inches, 3.41 inches more |
| Depth | 8.75 millimetres0.34 inches | 5.20 millimetres, 3.55 millimetres less0.20 inches, 0.14 inches less |
| Weight | 249 grams8.78 ounces | 254 grams, 5 grams more8.96 ounces, 0.18 ounces more |
| Volume | 111.5 cubic centimetres6.81 cubic inches | 100.8 cubic centimetres, 10.7 cubic centimetres less6.15 cubic inches, 0.65 cubic inches less |
| Screen-to-body — Active display area over body area. Our own estimate, not an Apple figure. | 91 percent | 90 percent, the same |
| Display size — Screen size is always quoted in inches. | 6.9 inches | 7.6 inches, 0.7 inches more |
| Resolution | 1320 × 2868 | 1878 × 2670 |
| Pixel density | 458 pixels per inch | 430 pixels per inch, 28 pixels per inch less |
| Cutout | Dynamic Island | None |
| Rear main | 48MP Fusion, variable aperture f/1.48-f/4.0 | 48MP Fusion f/1.6 |
| Rear ultra-wide | 48MP Fusion f/2.2 | 48MP Ultra Wide f/2.2 |
| Rear telephoto | 48MP Fusion 100mm (4x optical, 8x optical-quality) | — |
| Front camera | 18MP Center Stage f/1.9 | 12MP Center Stage f/2.2 (outer), under-display FaceTime f/1.8 (inner) |
| Chip | A20 Pro | A20 Pro |
| Video playback — Apple's rated hours of video playback. Apple does not publish battery capacity. | 45 hrs | 31 hrs |
| Port | USB-C | USB-C |
| Wireless | 5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem | 5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem |
| Water resistance | IP68 (6m for 30 min) | IP68 (6m for 30 min) |
| Storage | 256 GB – 2 TB | 256 GB – 2 TB |
| Launch price — Base configuration at launch, in US dollars. | 1,299 dollars | 1,999 dollars, 700 dollars more |
| Released | Sep 2026 | Oct 2026 |
| Status | Current | Current |
Also compared with iPhone 18 Pro Max
Questions about these phones
Does iPhone Duo (unfolded) fit in normal pockets compared to iPhone 18 Pro Max?
iPhone 18 Pro Max fits inside men's median jeans pockets, but iPhone Duo (unfolded) does not fit men's or women's pockets at 164.6 mm wide.
Can iPhone Duo (unfolded) be used with one hand like iPhone 18 Pro Max?
iPhone 18 Pro Max allows one-handed reach across its 78 mm width for an average adult hand, whereas iPhone Duo (unfolded) requires two hands across 164.6 mm.
Which phone is heavier between iPhone 18 Pro Max and iPhone Duo (unfolded)?
iPhone Duo (unfolded) weighs 254 g, making iPhone Duo (unfolded) 5 g heavier than iPhone 18 Pro Max at 249 g.
How much larger is the screen on iPhone Duo (unfolded) than iPhone 18 Pro Max?
iPhone Duo (unfolded) features a 7.6-inch screen, while iPhone 18 Pro Max features a 6.9-inch screen.
How do the overall dimensions of iPhone 18 Pro Max compare to iPhone Duo (unfolded)?
iPhone Duo (unfolded) is 5.2 mm deep and 117.8 mm tall, while iPhone 18 Pro Max is 8.75 mm deep and 163.4 mm tall.
Is iPhone Duo (unfolded) more expensive than iPhone 18 Pro Max?
iPhone Duo (unfolded) starts at 1999 USD, compared to 1299 USD for iPhone 18 Pro Max.