Apple iPhone 18 Pro Max vs Apple iPhone Duo: which should you buy?

Our pick

iPhone 18 Pro Max for the better cameras on a 6.9-inch screen
iPhone Duo for a phone that opens into a 7.6-inch screen

Apple iPhone 18 Pro Max

$1,299 (256GB)

Get it if

You zoom a lot, at concerts, games or on trips, and want the 48MP 4x telephoto.
You shoot serious video or edit photos and want ProRes and ProRAW.
You want the faster wired charge: 50% in about 15 minutes.

Buy at Apple$1,299

Checked Nov 15, 2026 · We may earn a commission.

Apple iPhone Duo

$1,999 (256GB)

Get it if

You read or watch video and want a 7.6-inch screen that folds into your pocket.
You want to sketch or take notes with Apple Pencil.
You prefer a titanium body to aluminum.

Buy at Apple$1,999

Checked Nov 15, 2026 · We may earn a commission.

Get the Pro Max for a 6.9-inch screen that never folds, the 48MP 4x telephoto with 8x optical-quality zoom, ProRes video, an 18MP selfie camera to the Duo's 12MP, faster charging and Face ID. Get the Duo if 6.9 inches is not enough: it opens into a 7.6-inch screen with Apple Pencil support, then closes to a 5.4-inch phone, at nearly the Pro Max's weight.

What's different

Thickness
iPhone 18 Pro Max8.75 mm
iPhone Duo11.3 mm closed, 5.2 mm open
The Pro Max's 6.9-inch screen is already large, and it never folds. The Duo has a 5.4-inch outer screen and opens to 7.6 inches and supports Apple Pencil (USB-C), which the Pro Max does not support. The two weigh almost the same, 249 g (8.78 oz) for the Pro Max and 254 g (8.96 oz) for the Duo, so the extra screen adds little weight. Closed, the Duo is 11.3 mm thick to the Pro Max's 8.75 mm; open, it is 5.2 mm.
The Pro Max has the more capable cameras
The Pro Max carries a 48MP 4x telephoto that reaches 8x optical-quality zoom, so concerts, sports and faraway detail come in close. The Duo's zoom stops at 2x, a 12MP crop of its main camera. On the Pro Max the main camera's aperture varies from f/1.48 to f/4.0; the Duo's stays at f/1.6. ProRes video, ProRAW photos and the LiDAR Scanner are Pro Max only, and its Center Stage selfie camera is 18MP to the Duo's 12MP outer camera.
Wired fast charge
iPhone 18 Pro Max (leads)50% in about 15 min (60W)
iPhone Duo50% in about 20 min (60W)
Apple rates the Pro Max for up to 45 hours of video playback, and the Duo for up to 44 hours on its outer screen and 31 hours on its inner screen. On a 60W adapter that supports Adjustable Voltage Supply, sold separately, the Pro Max reaches 50% in about 15 minutes; the Duo takes about 20 on a 60W adapter.
Unlock
iPhone 18 Pro MaxFace ID
iPhone DuoTouch ID in the side button
You unlock the Pro Max by looking at it with Face ID; the Duo reads your finger on the side button with Touch ID. The Pro Max is an aluminum unibody, and the Duo's foldable body is titanium.

What's the same

The A20 Pro chip with the same 6-core CPU and 7-core GPU
ProMotion up to 120Hz, an Always-On display and the Dynamic Island, with up to 3,000 nits outdoors
48MP Fusion Main and Fusion Ultra Wide cameras, and Camera Control
IP68, Wi-Fi 7, the second-generation Ultra Wideband chip, and 25W MagSafe and Qi2 charging

Tale of the Tape

iPhone 18 Pro Max

iPhone Duo

iPhone 18 Pro Max: 6.9-inch Screen sizeiPhone Duo: 7.6-inch inside, 5.4-inch cover
iPhone 18 Pro Max: 8.75 mm ThicknessiPhone Duo: 11.3 mm closed, 5.2 mm open
iPhone 18 Pro Max: 249 g (8.78 oz) WeightiPhone Duo: 254 g (8.96 oz)
iPhone 18 Pro Max: No Apple Pencil supportiPhone Duo: Yes (Apple Pencil USB-C) ✓
iPhone 18 Pro Max: 48MP 4x, up to 8x optical-quality zoom ✓ Telephoto cameraiPhone Duo: No 2x optical-quality crop of the main camera
iPhone 18 Pro Max: Variable, f/1.48 to f/4.0 ✓ Main camera apertureiPhone Duo: Fixed, f/1.6
iPhone 18 Pro Max: Yes ✓ ProRes video and ProRAW photosiPhone Duo: No
iPhone 18 Pro Max: Yes ✓ LiDAR ScanneriPhone Duo: No
iPhone 18 Pro Max: 18MP Center Stage Selfie cameraiPhone Duo: 12MP Center Stage (outer screen)
iPhone 18 Pro Max: Up to 45 hrs Video playback (rated)iPhone Duo: Up to 31 hrs (inner screen), 44 hrs (cover screen)
iPhone 18 Pro Max: 50% in about 15 min (60W) ✓ Wired fast chargeiPhone Duo: 50% in about 20 min (60W)
iPhone 18 Pro Max: Face ID UnlockiPhone Duo: Touch ID in the side button
iPhone 18 Pro Max: Aluminum unibody BodyiPhone Duo: Titanium foldable

FAQs

Which should you buy, the iPhone 18 Pro Max or the iPhone Duo?

The iPhone 18 Pro Max if you want the better cameras and a 6.9-inch screen that never folds; the iPhone Duo if you want a 7.6-inch screen that folds to pocket size.

Which has the better camera, the iPhone 18 Pro Max or the iPhone Duo?

The iPhone 18 Pro Max. Both have 48MP Main and Ultra Wide cameras, but only the Pro Max adds a 48MP 4x telephoto with 8x optical-quality zoom, a variable-aperture main camera, and ProRes video, and its selfie camera is 18MP to the Duo's 12MP.

Which has better battery life, the iPhone 18 Pro Max or the iPhone Duo?

The iPhone 18 Pro Max. Apple rates it for up to 45 hours of video playback; the Duo is rated for up to 44 hours on its outer screen but 31 hours on its 7.6-inch inner screen. The Pro Max also charges faster: 50% in about 15 minutes on a 60W adapter that supports Adjustable Voltage Supply, against about 20 minutes for the Duo on a 60W adapter.

Which is thinner, the iPhone 18 Pro Max or the iPhone Duo?

The iPhone 18 Pro Max when the Duo is closed: 8.75 mm to the Duo's 11.3 mm. Open, the Duo is 5.2 mm.