Head to head · October 2026
iPhone Duo vs iPhone 18 Pro Max
iPhone 18 Pro Max is 45.6 mm taller and 5 g lighter than iPhone Duo, with a 0.7″ smaller screen and 1 more hour of video.
Pick iPhone Duo for
- Big-screen viewing
- Slim and sleek
- Tablet in your pocket
From $1,999
Pick iPhone 18 Pro Max for
- Photography
- Budget
From $1,299
Our verdict
Which one should you buy?
Choose iPhone Duo if…
- you want the bigger screen: 7.6″ against 6.9″.
- you like a slim phone: 5.2 mm thin.
- you want a tablet-sized screen that folds into your pocket.
Choose iPhone 18 Pro Max if…
- you shoot a lot of photos: Triple 48MP rear cameras against Dual 48MP.
- price decides it: it starts $700 lower at Apple.
Side by side
Next to each other, to scale.
Unfolded
With iPhone Duo open.
Open, iPhone Duo is 164.6 × 117.8 × 5.2 mm with a 7.6-inch folding screen; iPhone 18 Pro Max has a 6.9-inch screen. iPhone Duo folded and unfolded against every iPhone →
Screen size
7.6″ vs 6.9″
iPhone Duo has the bigger screen: 7.6 inches (its inner folding screen; folded it shows a 5.4-inch outer screen) against 6.9 inches on iPhone 18 Pro Max, about 50% more glass (175.4 cm² against 116.7 cm²). iPhone Duo shows 1878 × 2670 pixels at 430 ppi and iPhone 18 Pro Max 2868 × 1320 at 460 ppi.
| Screen | iPhone Duo | iPhone 18 Pro Max |
|---|---|---|
| Diagonal | 7.6″ | 6.9″ |
| Approx. area | 175.4 cm² | 116.7 cm² |
| Resolution | 1878 × 2670 | 2868 × 1320 |
| Pixel density | 430 ppi | 460 ppi |
| Refresh rate | 120 Hz | 120 Hz |
Price
$1,999 vs $1,299
iPhone 18 Pro Max is the cheaper one: it starts at $1,299 at Apple in the US, $700 less than iPhone Duo at $1,999. The table shows every storage option and what each gigabyte costs.
| Storage | iPhone Duo | iPhone 18 Pro Max |
|---|---|---|
| 256 GB | $1,999 · $7.81/GB | $1,299 · $5.07/GB |
| 512 GB | $2,199 · $4.29/GB | $1,499 · $2.93/GB |
| 1 TB | $2,599 · $2.54/GB | $1,899 · $1.85/GB |
| 2 TB | $3,199 · $1.56/GB | $2,499 · $1.22/GB |
Full specifications
Every figure, side by side.
| Spec | iPhone Duo | iPhone 18 Pro Max |
|---|---|---|
| Introduced | 2026 | 2026 |
| Apple sells it new | Yes, from $1,999 | Yes, from $1,299 |
| Height | 117.8 mm | 163.4 mm |
| Width | 84.1 mm folded · 164.6 mm open | 78 mm |
| Thickness | 11.3 mm folded · 5.2 mm open | 8.75 mm |
| Weight | 254 g | 249 g |
| Display | 7.6″ inner · 5.4″ outer | 6.9″ |
| Resolution | 1878 × 2670 at 430 ppi inner · 1398 × 2034 at 460 ppi outer | 2868 × 1320 at 460 ppi |
| Refresh rate | 120 Hz ProMotion | 120 Hz ProMotion |
| Top of screen | Dynamic Island | Dynamic Island |
| Unlock | Touch ID in the side button | Face ID |
| Chip | A20 Pro | A20 Pro |
| Rear cameras | Dual 48MP | Triple 48MP |
| Video playback | Up to 44 h | Up to 45 h |
| RAM | Not confirmed (12 GB expected) | 12 GB |
| Storage | 256 GB, 512 GB, 1 TB, 2 TB | 256 GB, 512 GB, 1 TB, 2 TB |
| US price by storage | 256 GB $1,999 ($7.81/GB) · 512 GB $2,199 ($4.29/GB) · 1 TB $2,599 ($2.54/GB) · 2 TB $3,199 ($1.56/GB) | 256 GB $1,299 ($5.07/GB) · 512 GB $1,499 ($2.93/GB) · 1 TB $1,899 ($1.85/GB) · 2 TB $2,499 ($1.22/GB) |
| Colors | 2: Night Sky, Star White | 4: Black, Silver, Glacier, Burgundy |
Sources: Apple technical specifications for iPhone Duo and iPhone 18 Pro Max; US prices from apple.com, checked October 2026. Apple does not publish RAM; it comes from Apple's Xcode device data as reported by MacRumors, or Wikipedia's list of iPhone models for older phones.
What reviewers say
Duo or 18 Pro Max?
Their conclusions, in our words. Follow the links for the full reviews.
Tom's Guide · Oct 2026
An opinion piece: the writer found the excitement around the Duo made their brand-new 18 Pro Max feel unexciting, a useful gut-check for buyers torn between the two.
My iPhone 18 Pro Max just got delivered and I immediately regret the purchase — and I think iPhone Duo is to blame ↗9to5Mac · Oct 2026
A spec-by-spec rundown that leans practical: with Duo orders already slipping into 2027, the 18 Pro is the pick for anyone who needs a phone soon.
iPhone Duo vs iPhone 18 Pro: Here’s every key difference ↗MacRumors · Oct 2026
The Duo's extra cost buys a big folding screen and side-by-side multitasking, while the Pro models keep the more versatile cameras, Face ID and a much lower price.
iPhone 18 Pro vs. iPhone Duo Buyer's Guide: Which Should You Choose? ↗CNET · Oct 2026
CNET sees the Duo as a niche buy for people who want a pocketable reading and multitasking screen, and points camera, battery and durability buyers to the iPhone 18 Pro Max instead.
The $2,000 Duo: Who Is Apple's First Folding iPhone Actually For? ↗
More reviewer perspectives (2)
Yahoo Tech · Sep 2026
Pick the Duo for screen space and if you simply want a foldable; pick the 18 Pro Max for photography, video and the best camera controls.
Apple iPhone Duo vs. iPhone 18 Pro Max: How to decide between them ↗ZDNET · Sep 2026
Sticks with the 18 Pro: the Duo has no Pro camera controls or telephoto, swaps Face ID for Touch ID, is awkward one-handed when open and costs $800 more at 512GB.
iPhone Duo or 18 Pro? 8 reasons why I'm skipping Apple's first foldable ↗
FAQ
Questions people ask
- Is iPhone 18 Pro Max bigger than iPhone Duo?
- iPhone 18 Pro Max measures 163.4 × 78 × 8.75 mm and iPhone Duo measures 117.8 × 84.1 × 11.3 mm, so iPhone 18 Pro Max is 45.6 mm taller and 6.1 mm narrower (the foldable measured folded).
- Will an iPhone Duo case fit iPhone 18 Pro Max?
- No. The bodies differ by 45.6 mm in height, 6.1 mm in width and 2.55 mm in thickness, and cases are cut to within a fraction of a millimetre. Buy a case made for your exact model.
- Which has better battery life, iPhone Duo or iPhone 18 Pro Max?
- iPhone 18 Pro Max. Apple rates it for up to 45 hours of video playback against 44 hours for iPhone Duo.
- Is the iPhone Duo screen bigger than iPhone 18 Pro Max?
- iPhone Duo has the bigger screen: 7.6 inches (its inner folding screen; folded it shows a 5.4-inch outer screen) against 6.9 inches on iPhone 18 Pro Max, about 50% more glass (175.4 cm² against 116.7 cm²). iPhone Duo shows 1878 × 2670 pixels at 430 ppi and iPhone 18 Pro Max 2868 × 1320 at 460 ppi.
- Which is lighter?
- iPhone 18 Pro Max weighs 249 g, 5 g less than iPhone Duo (254 g).
- How much more does iPhone Duo cost than iPhone 18 Pro Max?
- iPhone 18 Pro Max is the cheaper one: it starts at $1,299 at Apple in the US, $700 less than iPhone Duo at $1,999. The table shows every storage option and what each gigabyte costs.
Keep comparing
Related match-ups.
News & analysis
What changes your choice.
Sourced news, with the comparison and buying implications explained. All news & analysis →
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