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Phone comparison

Apple iPhone 18 Pro Max vs Apple iPhone Duo

Short answer

The iPhone 18 Pro Max for most people.

The iPhone 18 Pro Max is the stronger all-round phone, with better cameras and a bigger battery. The iPhone Duo is a different kind of phone, a foldable that opens into a tablet-sized screen. Reviewers found the Duo exciting, but its cameras and many apps are not yet at the Pro Max's level.

Updated Oct 23, 2026

iPhone 18 Pro Max vs iPhone Duo

Reviewers' pick for most people

Apple iPhone 18 Pro Max

$1,299 launch price

Compass Score 8.9 from 39 critic reviews

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Get it if you want the best iPhone cameras, the longest battery life, and a phone that works like the iPhones you already know.

Skip it if you dislike big, heavy phones (reviewers pointed to the iPhone 18 Pro instead) or you own an iPhone 17 Pro Max.

See prices Full review

Apple iPhone Duo

$1,999 launch price

Compass Score 8.3 from 19 critic reviews

Change phone

Get it if you want a foldable that unfolds into a tablet-like screen, you love big screens, you are deep in Apple's world, and you will not miss a telephoto lens.

Skip it if you need top camera quality, rely on your phone for work, or do not need a phone that doubles as a tablet.

See prices Full review

What reviewers found

Topic by topic

Each row is something review sites agreed on. Open a row for the details.

Camera iPhone 18 Pro Max has the edge

Reviewers found the Pro Max has the better cameras. It has a telephoto lens and a variable aperture on the main camera, and the Duo has neither. Two sites called the Duo's cameras its main weakness.

5 sites agree: Engadget, HardwareZone and 3 more

Battery life iPhone 18 Pro Max has the edge

Reviewers found the Pro Max lasts longer. They described it as lasting about a day and a half to two days. The Duo got through a full day, but heavy use of the inner screen drains it faster.

5 sites agree: Gizmodo, HardwareZone and 3 more

Software

The Duo's iOS 27 is built for the wide screen and supports split-screen use. Many third-party apps are not yet updated and show black bars. It also uses Touch ID in place of Face ID. The Pro Max keeps Face ID and runs every app normally.

5 sites agree: CNET, Engadget and 3 more

Build

The Pro Max is 249g and 8.8mm thick. The Duo is 254g and 11.3mm thick when folded. Reviewers called both heavy. The Duo has a titanium frame and an IP68 rating, rare for a foldable.

4 sites agree: Engadget, HardwareZone and 2 more

Prices

Where to buy

The lowest prices we track today.

Apple iPhone 18 Pro Max

Certified refurbished 1 seller from $1,399 See refurbished

See all 1 iPhone 18 Pro Max deal →

Apple iPhone Duo

We don't track a price for the iPhone Duo yet. It launched at $1,999.

Spec data

How they compare

iPhone 18 Pro Max

iPhone Duo

Price (MSRP)

$1,299

$1,999

iOS

Processor

Apple A20 Pro Hexa-core

Camera zoom

4×

—

Battery life

19h 20m

GSMArena Active Use

—

Wired charging

60W

Wireless charging

25W

Display

Color, 120Hz

3000 nits peak

Color, 120Hz

3001 nits peak

Software support

—

Repairability

7/10

iFixit

—

Weight

249g (8.8 oz)

254g (9 oz)

Fingerprint

Highlighted cells indicate the stronger value where a clear winner exists.

Spec data

How they compare

iPhone 18 Pro Max

iPhone Duo

Price (MSRP)

$1,299

Price (MSRP)

$1,999

iOS

Processor

Apple A20 Pro Hexa-core

Processor

Apple A20 Pro Hexa-core

Camera zoom

4×

Camera zoom

—

Battery life

19h 20m

GSMArena Active Use

Battery life

—

Wired charging

60W

Wired charging

60W

Wireless charging

25W

Wireless charging

25W

Display

Color, 120Hz

3000 nits peak

Display

Color, 120Hz

3001 nits peak

Software support

—

Software support

—

Repairability

7/10

iFixit

Repairability

—

Weight

249g (8.8 oz)

Weight

254g (9 oz)

Fingerprint

Highlighted cells indicate the stronger value where a clear winner exists.

iPhone 18 Pro Max

iPhone Duo

Specifications are sourced from manufacturers and third-party databases and may contain errors. Suggest a correction →

Third-party data

Testing & benchmarks

iPhone 18 Pro Max

iPhone Duo

DxOMark

—

AnTuTu v10

3.46M

3.06M

GSMArena endurance

19h 20m

Active Use

—

iFixit repairability

7/10

—

Third-party data

Testing & benchmarks

iPhone 18 Pro Max

iPhone Duo

DxOMark

—

DxOMark

—

AnTuTu v10

3.46M

AnTuTu v10

3.06M

GSMArena endurance

19h 20m

Active Use

GSMArena endurance

—

iFixit repairability

7/10

iFixit repairability

—

Physical comparison

Size & weight

Footprint · to scale

iPhone 18 Pro Max

6.4" × 3.1"

iPhone Duo

4.6" × 3.3"

Thickness · to scale

iPhone 18 Pro Max

0.3"

iPhone Duo

0.4"

iPhone 18 Pro Max

iPhone Duo

Height

6.4" (163.4 mm)

4.6" (117.8 mm)

Width

3.1" (78 mm)

3.3" (84.1 mm)

Depth

0.3" (8.8 mm)

0.4" (11.3 mm)

Weight

249g (8.8 oz)

254g (9 oz)

Screen

6.9"

7.6"

Height

6.4" (163.4 mm)

Height

4.6" (117.8 mm)

Width

3.1" (78 mm)

Width

3.3" (84.1 mm)

Depth

0.3" (8.8 mm)

Depth

0.4" (11.3 mm)

Weight

249g (8.8 oz)

Weight

254g (9 oz)

Screen

6.9"

Screen

7.6"

Dimensions shown in inches (mm). Silhouettes are proportionally scaled for visual comparison.

Common questions

iPhone 18 Pro Max vs iPhone Duo: FAQ

Should I buy the iPhone 18 Pro Max or the iPhone Duo?

For most people, the iPhone 18 Pro Max. Reviewers found it has the better cameras and longer battery life, and it needs no adjusting. The iPhone Duo suits people who want a foldable with a tablet-sized screen and can live without a telephoto lens.

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

The iPhone 18 Pro Max. It has a telephoto lens and a variable aperture, and the Duo has neither. Reviewers said the Duo still takes sharp photos in good light, but zoomed shots look less crisp.

Does the iPhone 18 Pro Max last longer on battery than the iPhone Duo?

Yes, reviewers say so. Testers found the iPhone 18 Pro Max and 18 Pro last longer than the iPhone Duo, especially with heavy inner-screen use. In Engadget's video test the Duo ran 28 hours 48 minutes.

Is the iPhone Duo screen better than the iPhone 18 Pro Max screen?

It is bigger. The iPhone Duo opens to 7.6 inches, and reviewers liked its matte finish and barely visible crease. The iPhone 18 Pro Max has a 6.9-inch glossy screen and is easier to use as a regular phone.

Are apps ready for the iPhone Duo compared with the iPhone 18 Pro Max?

Not fully. Many third-party apps are not yet updated for the iPhone Duo and show black bars or stretched layouts. The iPhone 18 Pro Max runs all apps normally. Updates are arriving, and Apple's own apps already work well on the Duo.

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

Based on aggregated critic reviews, the iPhone 18 Pro Max earns a Compass Score of 8.9 compared to 8.3 for the iPhone Duo. That 0.6-point gap reflects stronger reviews across the board, though individual priorities like camera quality, battery life, or price could tip the scales the other way. Scores aggregate dozens of expert opinions, so they are a useful starting point, not the final word.

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

The iPhone 18 Pro Max launches at $1,299, which is $700 less than the iPhone Duo at $1,999. Street prices shift after launch, so check current deals for both phones before deciding.

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