iPhone 18 Pro Max vs iPhone Duo
Quick answer
The iPhone Duo is 45.6 millimetres1.80 inches shorter and 2.55 millimetres0.10 inches thicker than the iPhone 18 Pro Max.
The iPhone Duo is 86.6 millimetres3.41 inches wider and 45.6 millimetres1.80 inches shorter than the iPhone 18 Pro Max.
The iPhone Duo from Apple folds down compact but stays thick in hand, while the iPhone 18 Pro Max on Amazon (paid link) remains tall and standard. You pay more for the folding design even though both run the same chip at launch. Stick with the Pro Max for immediate value; the Duo suits only if you crave the shape.
Paid link.
Easier one-handed: iPhone Duo
Pocket: iPhone 18 Pro Max
Weight difference: Not noticeable
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: 117.8 by 84.1 by 11.3 millimetres, 254 grams.iPhone 18 Pro Max: 163.4 by 78 by 8.75 millimetres, 249 grams. iPhone Duo: 117.8 by 164.6 by 5.2 millimetres, 254 grams.
18 Pro Max, Duo shown at 2.1 pixels per millimetre.
iPhone 18 Pro Max
from $1,299 at launch.
Launch price, not a live Amazon price.
Check price on Amazon (paid link)iPhone DuoiPhone Duo
from $1,999 at launch, ships 23 October.
See on Apple
Paid link.
Height: 18 Pro Max 163.4 millimetres, Duo 117.8 millimetres.Height: 18 Pro Max 6.43 inches, Duo 4.64 inches.Width: 18 Pro Max 78.0 millimetres, Duo 84.1 millimetres.Width: 18 Pro Max 3.07 inches, Duo 3.31 inches.Depth: 18 Pro Max 8.75 millimetres, Duo 11.30 millimetres.Depth: 18 Pro Max 0.34 inches, Duo 0.44 inches.Weight: 18 Pro Max 249 grams, Duo 254 grams.Weight: 18 Pro Max 8.78 ounces, Duo 8.96 ounces.
Height: 18 Pro Max 163.4 millimetres, Duo 117.8 millimetres.Height: 18 Pro Max 6.43 inches, Duo 4.64 inches.Width: 18 Pro Max 78.0 millimetres, Duo 164.6 millimetres.Width: 18 Pro Max 3.07 inches, Duo 6.48 inches.Depth: 18 Pro Max 8.75 millimetres, Duo 5.20 millimetres.Depth: 18 Pro Max 0.34 inches, Duo 0.20 inches.Weight: 18 Pro Max 249 grams, Duo 254 grams.Weight: 18 Pro Max 8.78 ounces, Duo 8.96 ounces.
Specifications
| Specification | 18 Pro Max | Duo |
|---|---|---|
| Height | 163.4 millimetres6.43 inches163.4 millimetres6.43 inches | 117.8 millimetres, 45.6 millimetres less4.64 inches, 1.80 inches less117.8 millimetres, 45.6 millimetres less4.64 inches, 1.80 inches less |
| Height, open | — | 117.8 millimetres4.64 inches |
| Height, closed | — | 117.8 millimetres4.64 inches |
| Width | 78.0 millimetres3.07 inches78.0 millimetres3.07 inches | 84.1 millimetres, 6.1 millimetres more3.31 inches, 0.24 inches more164.6 millimetres, 86.6 millimetres more6.48 inches, 3.41 inches more |
| Width, open | — | 164.6 millimetres6.48 inches |
| Width, closed | — | 84.1 millimetres3.31 inches |
| Depth | 8.75 millimetres0.34 inches8.75 millimetres0.34 inches | 11.30 millimetres, 2.55 millimetres more0.44 inches, 0.10 inches more5.20 millimetres, 3.55 millimetres less0.20 inches, 0.14 inches less |
| Depth, open | — | 5.20 millimetres0.20 inches |
| Depth, closed | — | 11.30 millimetres0.44 inches |
| Weight | 249 grams8.78 ounces249 grams8.78 ounces | 254 grams, 5 grams more8.96 ounces, 0.18 ounces more254 grams, 5 grams more8.96 ounces, 0.18 ounces more |
| Volume | 111.5 cubic centimetres6.81 cubic inches111.5 cubic centimetres6.81 cubic inches | 111.9 cubic centimetres, 0.4 cubic centimetres more6.83 cubic inches, 0.03 cubic inches more100.8 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 percent91 percent | 89 percent, 2 percent less90 percent, the same |
| Display size — Screen size is always quoted in inches. | 6.9 inches6.9 inches | 5.4 inches, 1.5 inches less7.6 inches, 0.7 inches more |
| Resolution | 1320 × 28681320 × 2868 | 1398 × 20341878 × 2670 |
| Pixel density | 460 pixels per inch460 pixels per inch | 460 pixels per inch, the same430 pixels per inch, 30 pixels per inch less |
| Cutout | Dynamic IslandDynamic Island | Dynamic IslandNone |
| Rear main | 48MP Fusion, variable aperture f/1.48-f/4.048MP Fusion, variable aperture f/1.48-f/4.0 | 48MP Fusion f/1.648MP Fusion f/1.6 |
| Rear ultra-wide | 48MP Fusion f/2.248MP Fusion f/2.2 | 48MP Ultra Wide f/2.248MP Ultra Wide f/2.2 |
| Rear telephoto | 48MP Fusion 100mm (4x optical, 8x optical-quality)48MP Fusion 100mm (4x optical, 8x optical-quality) | —— |
| Front camera | 18MP Center Stage f/1.918MP Center Stage f/1.9 | 12MP Center Stage f/2.2 (outer), under-display FaceTime f/1.8 (inner)12MP Center Stage f/2.2 (outer), under-display FaceTime f/1.8 (inner) |
| Chip | A20 ProA20 Pro | A20 ProA20 Pro |
| Video playback — Apple's rated hours of video playback. Apple does not publish battery capacity. | 45 hrs45 hrs | 44 hrs31 hrs |
| Port | USB-CUSB-C | USB-CUSB-C |
| Wireless | 5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem | 5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem |
| Water resistance | IP68 (6m for 30 min)IP68 (6m for 30 min) | IP68 (6m for 30 min)IP68 (6m for 30 min) |
| Storage | 256 GB – 2 TB256 GB – 2 TB | 256 GB – 2 TB256 GB – 2 TB |
| Launch price — Base configuration at launch, in US dollars. | 1,299 dollars1,299 dollars | 1,999 dollars, 700 dollars more1,999 dollars, 700 dollars more |
| Released | Sep 2026Sep 2026 | Oct 2026Oct 2026 |
| Status | CurrentCurrent | CurrentCurrent |
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Questions about these phones
How much shorter is iPhone Duo than iPhone 18 Pro Max?
iPhone Duo is 45.6 mm shorter than iPhone 18 Pro Max when closed. It is also 6.1 mm wider and 2.55 mm deeper.
Which phone has a larger screen, iPhone 18 Pro Max or iPhone Duo?
iPhone 18 Pro Max has a 6.9 inch display, which is 1.5 inches larger than the iPhone Duo's 5.4 inch screen.
Is iPhone Duo easier to use with one hand?
Yes, iPhone Duo is easier to use with one hand than iPhone 18 Pro Max. It is also better suited for smaller hands.
Which phone fits in a typical men's jeans pocket?
iPhone 18 Pro Max fits in a typical men's jeans pocket, while iPhone Duo does not.
What is the weight difference between iPhone 18 Pro Max and iPhone Duo?
iPhone Duo weighs 5 grams more than iPhone 18 Pro Max at 254 grams total. This difference is not noticeable to most users.
Is upgrading to iPhone 18 Pro Max worth it for size alone?
Whether the size upgrade is worth it depends on your specific needs. iPhone 18 Pro Max offers more pocketability while iPhone Duo offers one-handed ease.