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Phone and foldable comparisons

iPhone 15 Pro Max vs Samsung Galaxy S24 Ultra

Compare large iPhone and Android flagship viewport references for mobile layout testing.

At a glance

Measured screen and viewport differences

Values combine reference display records and calculated geometry. Rounded corners, cutouts, hinges, browser UI, and device modes can change the usable area.

CSS viewport reference

iPhone 15 Pro Max
430 × 932 CSS px
Samsung Galaxy S24 Ultra
480 × 1067 CSS px

Physical resolution

iPhone 15 Pro Max
1,290 × 2,796 px
Samsung Galaxy S24 Ultra
1,440 × 3,120 px

Diagonal

iPhone 15 Pro Max
6.7 inches
Samsung Galaxy S24 Ultra
6.8 inches

Calculated panel size

iPhone 15 Pro Max
6.1 × 2.8 inches
Samsung Galaxy S24 Ultra
6.2 × 2.8 inches

Calculated screen area

iPhone 15 Pro Max
17.1 square inches
Samsung Galaxy S24 Ultra
17.6 square inches

Pixel density

iPhone 15 Pro Max
460 PPI
Samsung Galaxy S24 Ultra
505 PPI

Aspect ratio

iPhone 15 Pro Max
19.5:9
Samsung Galaxy S24 Ultra
19.5:9

Device pixel ratio

iPhone 15 Pro Max
DPR 3
Samsung Galaxy S24 Ultra
DPR 3

Decision guide

Choose the screen that fits the task

Large iPhone and Android devices can feel similar in hand but report different CSS viewport widths, heights, DPR, and browser UI behavior. Test both when mobile bugs are important.

Choose iPhone 15 Pro Max when

  • Compare iOS Safari and Android Chrome viewport expectations.
  • Record DPR and viewport size when reporting screenshot differences.
Review iPhone 15 Pro Max data

Choose Samsung Galaxy S24 Ultra when

  • Record DPR and viewport size when reporting screenshot differences.
  • Check tall mobile layouts, sticky elements, and visual viewport behavior.
Review Samsung Galaxy S24 Ultra data

Visual comparison

Compare screen shapes

Compare physical screen proportions and native pixel grids, or switch to CSS viewport references for responsive-layout work. Every drawing uses one shared scale so the relative size remains meaningful.

Left device
Right device

CSS viewport comparison

Compare two devices to see the relative area.

—

iPhone 15 Pro Max

iPhone · DPR 3 · 460 PPI

—

Samsung Galaxy S24 Ultra

Android · DPR 3 · 505 PPI

Proportional comparison of iPhone 15 Pro Max and Samsung Galaxy S24 Ultra using physical screen dimensions, CSS viewport references, or native pixel grids.

Decision factors

What materially changes between these displays?

CSS viewport area

iPhone 15 Pro Max
400,760 CSS pixels
Samsung Galaxy S24 Ultra
512,160 CSS pixels

Samsung Galaxy S24 Ultra provides about 28% more normalized viewport area in this reference pair.

Physical pixel count

iPhone 15 Pro Max
3,606,840 pixels
Samsung Galaxy S24 Ultra
4,492,800 pixels

Physical pixels help explain screenshot and media detail; live layout still follows the browser viewport and scaling.

Physical display area

iPhone 15 Pro Max
17.1 square inches
Samsung Galaxy S24 Ultra
17.6 square inches

Samsung Galaxy S24 Ultra is the larger calculated panel, excluding bezels, curvature, stands, hinges, and chassis.

Practical considerations

What should you verify before deciding?

  • Compare iOS Safari and Android Chrome viewport expectations.
  • Record DPR and viewport size when reporting screenshot differences.
  • Check tall mobile layouts, sticky elements, and visual viewport behavior.

Methodology and sources

Calculation method and evidence

Physical dimensions are calculated from diagonal and aspect ratio. Named-product hardware claims use manufacturer specifications; CSS viewports remain practical browser references.

How the geometry is calculated

Width and height divide the diagonal using the stated aspect ratio. Screen area is width × height, and PPI divides the diagonal pixel count by the diagonal inches.

Reviewed under the ScreenMetricLab methodology and editorial policy. Reference values are not a substitute for checking the exact model, browser, scaling, and accessibility settings you will use.

Frequently asked questions

Questions about this comparison

Can Android and iPhone with similar sizes have different viewport widths?

Yes. OS scaling, browser UI, DPR, and display mode can change the effective CSS viewport.

Which phone should I test first?

Use both an iPhone and Android reference for important mobile flows because browser behavior can differ.

Does DPR explain screenshot differences?

Often yes. DPR affects how CSS pixels map to physical pixels and how image assets appear.

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