iphonesize

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.

Both phones run the same chip and software, so you won't feel a speed gap. The Pro Max on Amazon (paid link) fits your pocket and hand easier, but the new Duo (paid link) just launched at $1,999. If the fold feels right, wait for a sale; otherwise the Pro Max is your pick.

Paid link.

Easier one-handedUnclear

PocketiPhone 18 Pro Max

Weight differenceNot noticeable

Paid link.

Paid link.

HeightWidthDepthWeight18 Pro Max163.4 millimetres6.43 inches78.0 millimetres3.07 inches8.75 millimetres0.34 inches249 grams8.78 ouncesDuo117.8 millimetres, 45.6 millimetres less4.64 inches, 1.80 inches less84.1 millimetres, 6.1 millimetres more3.31 inches, 0.24 inches more11.30 millimetres, 2.55 millimetres more0.44 inches, 0.10 inches more254 grams, 5 grams more8.96 ounces, 0.18 ounces more

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.

HeightWidthDepthWeight18 Pro Max163.4 millimetres6.43 inches78.0 millimetres3.07 inches8.75 millimetres0.34 inches249 grams8.78 ouncesDuo117.8 millimetres, 45.6 millimetres less4.64 inches, 1.80 inches less164.6 millimetres, 86.6 millimetres more6.48 inches, 3.41 inches more5.20 millimetres, 3.55 millimetres less0.20 inches, 0.14 inches less254 grams, 5 grams more8.96 ounces, 0.18 ounces more

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

Specifications for iPhone 18 Pro Max, iPhone Duo. Differences are given against iPhone 18 Pro Max.
Specification18 Pro MaxDuo
Height163.4 millimetres6.43 inches163.4 millimetres6.43 inches117.8 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
Width78.0 millimetres3.07 inches78.0 millimetres3.07 inches84.1 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
Depth8.75 millimetres0.34 inches8.75 millimetres0.34 inches11.30 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
Weight249 grams8.78 ounces249 grams8.78 ounces254 grams, 5 grams more8.96 ounces, 0.18 ounces more254 grams, 5 grams more8.96 ounces, 0.18 ounces more
Volume111.5 cubic centimetres6.81 cubic inches111.5 cubic centimetres6.81 cubic inches111.9 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 percent89 percent, 2 percent less90 percent, the same
Display size — Screen size is always quoted in inches.6.9 inches6.9 inches5.4 inches, 1.5 inches less7.6 inches, 0.7 inches more
Resolution1320 × 28681320 × 28681398 × 20341878 × 2670
Pixel density460 pixels per inch460 pixels per inch460 pixels per inch, the same430 pixels per inch, 30 pixels per inch less
CutoutDynamic IslandDynamic IslandDynamic IslandNone
Rear main48MP Fusion, variable aperture f/1.48-f/4.048MP Fusion, variable aperture f/1.48-f/4.048MP Fusion f/1.648MP Fusion f/1.6
Rear ultra-wide48MP Fusion f/2.248MP Fusion f/2.248MP Ultra Wide f/2.248MP Ultra Wide f/2.2
Rear telephoto48MP Fusion 100mm (4x optical, 8x optical-quality)48MP Fusion 100mm (4x optical, 8x optical-quality)——
Front camera18MP Center Stage f/1.918MP Center Stage f/1.912MP 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)
ChipA20 ProA20 ProA20 ProA20 Pro
Video playback — Apple's rated hours of video playback. Apple does not publish battery capacity.45 hrs45 hrs44 hrs31 hrs
PortUSB-CUSB-CUSB-CUSB-C
Wireless5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem5G · Wi-Fi 7 · Bluetooth 6 · Apple C2 modem
Water resistanceIP68 (6m for 30 min)IP68 (6m for 30 min)IP68 (6m for 30 min)IP68 (6m for 30 min)
Storage256 GB – 2 TB256 GB – 2 TB256 GB – 2 TB256 GB – 2 TB
Launch price — Base configuration at launch, in US dollars.1,299 dollars1,299 dollars1,999 dollars, 700 dollars more1,999 dollars, 700 dollars more
ReleasedSep 2026Sep 2026Oct 2026Oct 2026
StatusCurrentCurrentCurrentCurrent

Dimensions

The iPhone Duo (closed) is 45.6 mm (1.80 in) shorter, 6.1 mm (0.24 in) wider, 2.55 mm (0.10 in) thicker and 5 g (0.18 oz) heavier than the iPhone 18 Pro Max. The iPhone 18 Pro Max measures 163.4 × 78.0 × 8.75 mm (6.43 × 3.07 × 0.34 in) and weighs 249 g (8.78 oz). The iPhone Duo (closed) measures 117.8 × 84.1 × 11.30 mm (4.64 × 3.31 × 0.44 in) and weighs 254 g (8.96 oz). The iPhone Duo (open) measures 117.8 × 164.6 × 5.20 mm (4.64 × 6.48 × 0.20 in) and weighs 254 g (8.96 oz).

Also compared with iPhone 18 Pro Max

Questions about these phones

How much shorter is the iPhone Duo compared to the iPhone 18 Pro Max?

The iPhone Duo is 45.6 mm shorter than the iPhone 18 Pro Max. This reduces the overall height you hold in your hand.

Is the iPhone Duo wider than the iPhone 18 Pro Max?

The iPhone Duo is 6.1 mm wider than the iPhone 18 Pro Max when closed. This gives it a broader width despite the lower height.

Which phone is heavier, the iPhone 18 Pro Max or the iPhone Duo?

The iPhone Duo weighs 5 grams more than the iPhone 18 Pro Max. The weight difference is not considered noticeable by most users.

Does the iPhone Duo fit in a typical men's jeans pocket?

The iPhone Duo does not fit in a median men's jeans pocket. The iPhone 18 Pro Max fits in a median men's jeans pocket.

Which phone is better for small hands?

The iPhone Duo is better for small hands because it is shorter. One-handed ease is unclear for both the iPhone 18 Pro Max and the iPhone Duo.

How does the screen size compare between the two phones?

The iPhone 18 Pro Max has a 6.9 inch screen and the iPhone Duo has a 5.4 inch screen. The iPhone 18 Pro Max display is 1.5 inches larger.