iPhone Duo (unfolded) vs iPhone 18 Pro Max
86.6 mm narrower, 45.6 mm taller and 5 g lighter.
Quick answer
iPhone Duo (unfolded) offers a 7.6 inches screen designed for two-handed use, measuring 164.6 mm wide, 117.8 mm high, and 5.2 mm deep. In contrast, iPhone 18 Pro Max uses a standard bar shape at 78 mm wide, 163.4 mm high, and 8.75 mm deep with a 6.9 inches screen. iPhone Duo (unfolded) does not fit into measured men's or women's median jeans pockets while open. iPhone 18 Pro Max fits into measured men's jeans pockets but fails women's pockets. iPhone Duo (unfolded) weighs 254 g, which is close to the 249 g weight of iPhone 18 Pro Max, but iPhone 18 Pro Max delivers 45 hours of video playback compared to 31 hours.
- iPhone Duo (unfolded) requires two hands across its 164.6 mm width.
- iPhone 18 Pro Max fits measured men's pockets; iPhone Duo (unfolded) fits neither.
- iPhone 18 Pro Max offers 45 hours of video versus 31 hours on iPhone Duo (unfolded).
- Both weigh similarly, separated by only 5 g in a jacket pocket.
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 Duo (unfolded): 117.8 by 164.6 by 5.2 millimetres, 254 grams. iPhone 18 Pro Max: 163.4 by 78 by 8.75 millimetres, 249 grams.
Duo open, 18 Pro Max shown at 2.1 pixels per millimetre.
Height: Duo open 117.8 millimetres, 18 Pro Max 163.4 millimetres.Height: Duo open 4.64 inches, 18 Pro Max 6.43 inches.Width: Duo open 164.6 millimetres, 18 Pro Max 78.0 millimetres.Width: Duo open 6.48 inches, 18 Pro Max 3.07 inches.Depth: Duo open 5.20 millimetres, 18 Pro Max 8.75 millimetres.Depth: Duo open 0.20 inches, 18 Pro Max 0.34 inches.Weight: Duo open 254 grams, 18 Pro Max 249 grams.Weight: Duo open 8.96 ounces, 18 Pro Max 8.78 ounces.
Specifications
| Specification | Duo open | 18 Pro Max |
|---|---|---|
| Height | 117.8 millimetres4.64 inches | 163.4 millimetres, 45.6 millimetres more6.43 inches, 1.80 inches more |
| Width | 164.6 millimetres6.48 inches | 78.0 millimetres, 86.6 millimetres less3.07 inches, 3.41 inches less |
| Depth | 5.20 millimetres0.20 inches | 8.75 millimetres, 3.55 millimetres more0.34 inches, 0.14 inches more |
| Weight | 254 grams8.96 ounces | 249 grams, 5 grams less8.78 ounces, 0.18 ounces less |
| Volume | 100.8 cubic centimetres6.15 cubic inches | 111.5 cubic centimetres, 10.7 cubic centimetres more6.81 cubic inches, 0.65 cubic inches more |
| Screen-to-body — Active display area over body area. Our own estimate, not an Apple figure. | 90 percent | 91 percent, the same |
| Display size — Screen size is always quoted in inches. | 7.6 inches | 6.9 inches, 0.7 inches less |
| Resolution | 1878 × 2670 | 1320 × 2868 |
| Pixel density | 430 pixels per inch | 458 pixels per inch, 28 pixels per inch more |
| Cutout | None | Dynamic Island |
| Rear main | 48MP Fusion f/1.6 | 48MP Fusion, variable aperture f/1.48-f/4.0 |
| Rear ultra-wide | 48MP Ultra Wide f/2.2 | 48MP Fusion f/2.2 |
| Rear telephoto | — | 48MP Fusion 100mm (4x optical, 8x optical-quality) |
| Front camera | 12MP Center Stage f/2.2 (outer), under-display FaceTime f/1.8 (inner) | 18MP Center Stage f/1.9 |
| Chip | A20 Pro | A20 Pro |
| Video playback — Apple's rated hours of video playback. Apple does not publish battery capacity. | 31 hrs | 45 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. | 1,999 dollars | 1,299 dollars, 700 dollars less |
| Released | Oct 2026 | Sep 2026 |
| Status | Current | Current |
Also compared with iPhone Duo (unfolded)
Questions about these phones
How do the screen sizes compare between iPhone Duo (unfolded) and iPhone 18 Pro Max?
iPhone Duo (unfolded) provides a 7.6 inches display, while iPhone 18 Pro Max features a 6.9 inches screen.
Can iPhone Duo (unfolded) or iPhone 18 Pro Max be used with one hand?
iPhone 18 Pro Max allows partial one-handed reach at 78 mm wide, whereas the 164.6 mm width of iPhone Duo (unfolded) demands two hands.
Do iPhone Duo (unfolded) and iPhone 18 Pro Max fit in standard jeans pockets?
iPhone 18 Pro Max fits into measured men's median jeans pockets, but iPhone Duo (unfolded) fits neither men's nor women's pockets while open.
Which phone is heavier between iPhone Duo (unfolded) and iPhone 18 Pro Max?
iPhone Duo (unfolded) weighs 254 g, making it 5 g heavier than the 249 g iPhone 18 Pro Max.
How does battery life compare between iPhone Duo (unfolded) and iPhone 18 Pro Max?
iPhone 18 Pro Max provides up to 45 hours of video playback, compared to 31 hours on iPhone Duo (unfolded).
Is iPhone Duo (unfolded) worth the price increase over iPhone 18 Pro Max?
iPhone Duo (unfolded) starts at 1999 USD for a foldable format, while iPhone 18 Pro Max starts at 1299 USD with longer battery life.