Where they actually differ
The most decisive specs, ranked by how much they matter — before the full spec table.
| Spec | Apple - iPhone 18 Pro Max | Apple - iPhone Duo |
|---|---|---|
| Front camera | 18 MP | 12 MP |
| Battery capacity | 5391 mAh | 4883 mAh |
| Screen size | 6.9 " | 7.6 " |
| Pixel density | 460 ppi | 430 ppi |
| Weight | 249 g | 254 g |
Between the iPhone 18 Pro Max and iPhone Duo, the iPhone 18 Pro Max comes out ahead in front camera / battery capacity, while the iPhone Duo wins on screen size. Overall, the iPhone 18 Pro Max scores 69.9 and the iPhone Duo scores 69.8 on our Mars Score.
Which should you buy?
These two are nearly even on the Mars Score (69.9 vs 69.8). The decision is not about overall quality — both clear the bar — it is about which specific trade-offs fit your use.
Pick the iPhone 18 Pro Max if your top frustration with your current device is running out of charge before the day ends — endurance is the lead spec here. The biggest gaps in its favor are front camera, battery capacity, pixel density, among others. The single most decisive one: Front camera — 50.00% more. 18 MP vs 12 MP.
Pick the iPhone Duo if the display is what you stare at all day — refresh rate, brightness, or sharpness is where the difference will be most visible. Its strongest claims are screen size. The single most decisive one: Screen size — 10.14% more. 7.6 " vs 6.9 ".
Both ship with comparable ram, main camera, refresh rate, so those specs do not separate the two — focus on the differences below.
Bottom line: there is no wrong answer here — match the spec advantages to how you actually use the product. The Mars Score parity says both are well-rounded; the differences are about trade-offs, not quality.
Which should you buy: Apple - iPhone 18 Pro Max or Apple - iPhone Duo?
Apple - iPhone 18 Pro Max leads the current Mars Score by 0.1 points.The more useful decision is the trade-off behind that result: compare screen size, pixel density, battery capacity against the way you will actually use the product.
Choose Apple - iPhone 18 Pro Max if…
Apple - iPhone 18 Pro Max has the measurable edge on front cam mp, battery capacity mah, pixel density ppi.
Choose Apple - iPhone Duo if…
Apple - iPhone Duo has the measurable edge on screen size in.
This is a structured comparison of the published catalog values. It is not a claim of identical real-world performance across every workload; use the linked spec drill-downs and methodology page to inspect the inputs.
Why Apple - iPhone 18 Pro Max wins
- ▲Front camera — 50.00% more. 18 MP vs 12 MP.
- ▲Battery capacity — 10.40% more. 5391 mAh vs 4883 mAh.
- ▲Pixel density — 6.98% more. 460 ppi vs 430 ppi.
- ▲Weight — 5.00 g less. 249 vs 254.
Why Apple - iPhone Duo wins
- ▲Screen size — 10.14% more. 7.6 " vs 6.9 ".
Spec comparison
Design
| Spec | Apple - iPhone 18 Pro Max | Apple - iPhone Duo |
|---|---|---|
| Weight | 249 glead | 254 g |
| Thickness | 8.75 mmlead | 11.3 mm |
| Water resistanceⓘ | IP68 | IP68 |
| Form factor | bar | foldable_booklead |
Display
| Spec | Apple - iPhone 18 Pro Max | Apple - iPhone Duo |
|---|---|---|
| Screen size | 6.9 " | 7.6 "lead |
| Pixel densityⓘ | 460 ppilead | 430 ppi |
| Refresh rateⓘ | 120 Hz | 120 Hz |
| Peak brightnessⓘ | 3000 nits | 3000 nits |
Performance
| Spec | Apple - iPhone 18 Pro Max | Apple - iPhone Duo |
|---|---|---|
| RAMⓘ | 12 GB | 12 GB |
| Storageⓘ | 256 GB | 256 GB |
| AnTuTuⓘ | 3550000 | 3550000 |
| CPU total clockⓘ | 20.3 GHz | 20.3 GHz |
Cameras
| Spec | Apple - iPhone 18 Pro Max | Apple - iPhone Duo |
|---|---|---|
| Main cameraⓘ | 48 MP | 48 MP |
| Front camera | 18 MPlead | 12 MP |
| Optical image stabilizationⓘ | true | true |
Battery
| Spec | Apple - iPhone 18 Pro Max | Apple - iPhone Duo |
|---|---|---|
| Battery capacityⓘ | 5391 mAhlead | 4883 mAh |
| Wired chargingⓘ | 60 W | 60 W |
| Wireless chargingⓘ | 25 W | 25 W |
Connectivity
| Spec | Apple - iPhone 18 Pro Max | Apple - iPhone Duo |
|---|---|---|
| 5G supportⓘ | true | true |
| Headphone jack | false | false |
| microSD slot | false | false |
Operating System
| Spec | Apple - iPhone 18 Pro Max | Apple - iPhone Duo |
|---|---|---|
| OS | iOS | iOS |
| Promised OS updates | 6 years | 6 years |
Frequently asked
Which has better battery, iPhone 18 Pro Max or iPhone Duo?+
iPhone 18 Pro Max has 10.4% more battery — 5391 mAh vs 4883 mAh.
Which is lighter, iPhone 18 Pro Max or iPhone Duo?+
iPhone 18 Pro Max is 5g lighter — 249g vs 254g.
Is iPhone 18 Pro Max waterproof?+
iPhone 18 Pro Max has an IP68 rating.
Does iPhone Duo support 5G?+
Yes, iPhone Duo supports 5G.
Which has a better camera, iPhone 18 Pro Max or iPhone Duo?+
iPhone Duo has a 48 MP main camera vs 48 MP.