CSS viewport reference
- iPhone 15 Pro Max
- 430 × 932 CSS px
- Samsung Galaxy S24 Ultra
- 480 × 1067 CSS px
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.
Reviewed by ScreenMetricLab Editorial Team
Updated 2026-09-20
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.
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
iOS-focused QA and Apple display context. By contrast, Android-focused QA and higher-resolution Galaxy context. Treat browser viewport profiles as scenarios, not product-quality rankings.
Choose iPhone 15 Pro Max when
- iOS-focused QA and Apple display context.
- People whose space, workflow or test coverage is better represented by Iphone 15 Pro Max Screen Size.
Choose Samsung Galaxy S24 Ultra when
- Android-focused QA and higher-resolution Galaxy context.
- People whose space, workflow or test coverage is better represented by Samsung Galaxy S24 Ultra Screen Size.
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?
Primary advantage
- iPhone 15 Pro Max
- iOS-focused QA and Apple display context
- Samsung Galaxy S24 Ultra
- Android-focused QA and higher-resolution Galaxy context
Treat browser viewport profiles as scenarios, not product-quality rankings.
Responsive-testing role
- iPhone 15 Pro Max
- Use Iphone 15 Pro Max Screen Size as one documented layout scenario
- Samsung Galaxy S24 Ultra
- Use Samsung Galaxy S24 Ultra Screen Size as a distinct adjacent scenario
Test real content and neighboring widths; neither record is a universal breakpoint or a substitute for a measured browser state.
Measurement boundary
- iPhone 15 Pro Max
- Keep native pixels, CSS viewport and physical size separate
- Samsung Galaxy S24 Ultra
- Keep native pixels, CSS viewport and physical size separate
Window size, zoom, operating-system scaling, browser controls and accessibility settings can change usable webpage space.
Scenario matrix
Which option wins for common use cases?
A winner applies only to the stated task. Read the limitation before treating it as a complete product recommendation.
Priority matches the first option
- Recommended
- Iphone 15 Pro Max Screen Size
- Why
- iOS-focused QA and Apple display context.
- Limitation
- Confirm product-specific ergonomics, performance and live viewport behavior separately.
Priority matches the second option
- Recommended
- Samsung Galaxy S24 Ultra Screen Size
- Why
- Android-focused QA and higher-resolution Galaxy context.
- Limitation
- The larger or denser reference is not automatically better for every space or task.
Responsive QA coverage
- Recommended
- Test both references
- Why
- The pair exposes different layout pressures and helps prevent optimization around a single width.
- Limitation
- Emulation checks geometry only; important journeys still need representative browsers and input methods.
Practical considerations
What should you verify before deciding?
- Treat browser viewport profiles as scenarios, not product-quality rankings.
- Compare CSS viewport values for layout work and native pixels for hardware or media context; do not use them interchangeably.
- Record browser, operating system, scaling, zoom, orientation and window state when a comparison informs release QA.
- For a purchase, verify exact model dimensions, ergonomics, ports, performance, warranty and accessibility needs separately.
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.
First-party calculation and editorial methodChecked 2026-09-20
ScreenMetricLab display calculation and review methodology
Calculated geometry, normalized comparison fields, source hierarchy and interpretation limits.
Reviewed ScreenMetricLab recordChecked 2026-09-20
Iphone 15 Pro Max Screen Size reviewed device record
Left-side hardware facts, calculation basis, source link and viewport limitations.
Reviewed ScreenMetricLab recordChecked 2026-09-20
Samsung Galaxy S24 Ultra Screen Size reviewed device record
Right-side hardware facts, calculation basis, source link and viewport limitations.
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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