iPhone 15 Pro Max vs Galaxy S24 Ultra: screen size and viewport
The iPhone 15 Pro Max lays web pages out at 430 × 932 CSS px with a pixel ratio of 3; the Galaxy S24 Ultra at 384 × 832 with 2.813. The iPhone 15 Pro Max is 46 px wider and 100 px taller.
The two screens side by side
Specs compared
| Spec | iPhone 15 Pro Max | Galaxy S24 Ultra | Difference |
|---|---|---|---|
| Viewport, portrait (CSS px) | 430 × 932 | 384 × 832 | +46 px wide, +100 px tall |
| Device pixel ratio | 3 | 2.813 | +0.188 for the iPhone 15 Pro Max |
| Physical resolution | 1290 × 2796 | 1080 × 2340 | iPhone 15 Pro Max: 43% more pixels |
| Aspect ratio | 19.5:9 | 19.5:9 | about the same |
| Visible height, portrait, with browser bars | ~742 px | ~736 px | +6 px for the iPhone 15 Pro Max |
| Landscape width (CSS px) | 932 px | 832 px | +100 px for the iPhone 15 Pro Max |
| Visible height, landscape | ~380 px | ~304 px | +76 px for the iPhone 15 Pro Max |
| First released | 2022 | 2024 | 2 years apart |
| Engine in MobileCheck | WebKit (Safari) | Chromium (Chrome) | different engines |
CSS px are the units media queries see. Visible heights subtract the status bar and the Safari on iOS and Chrome on Android bars as set in our device profiles; real bar heights vary with settings and scrolling. The release year is that of the first model with each screen.
What this means for your layout
How the width difference affects your layout
The iPhone 15 Pro Max is 46 CSS px wider (430 vs 384, 12% more). 3 common breakpoints fall between them: (min-width: 390px) (a common phone test width), (min-width: 414px) (a common large-phone test width), (min-width: 430px) (a common large-phone test width) match the iPhone 15 Pro Max but not the Galaxy S24 Ultra, so a rule written for that width applies on only one of the two.
In a 2-column card grid with 16 px page padding and 16 px gaps, each card is 191 px wide on the iPhone 15 Pro Max and 168 px on the Galaxy S24 Ultra. Check that buttons, prices and long words still fit in the narrower one.
Pixel density and image sizes
The iPhone 15 Pro Max has the denser screen: 3× against 2.813×. A full-width image (sizes="100vw") needs about 1290 px on the iPhone 15 Pro Max and 1080 px on the Galaxy S24 Ultra to look sharp.
With a srcset such as 640w, 828w, 1080w, 1290w, 1440w, 1640w, 2048w, the browser would normally pick the 1290w file on the iPhone 15 Pro Max and the 1080w file on the Galaxy S24 Ultra. Leave out the 1290w candidate and the iPhone 15 Pro Max upscales a smaller file.
The Galaxy S24 Ultra's ratio of 2.813 is fractional: one CSS pixel isn't a whole number of device pixels, so 1 px borders and hairlines can be rounded unevenly. Check thin lines on that screen rather than assuming they match.
How much fits above the fold
On first load about 742 px of the page is visible on the iPhone 15 Pro Max and 736 px on the Galaxy S24 Ultra: 6 px less (1%) on the Galaxy S24 Ultra. That's less than one line of body text, so in practice both show the same first screen.
In landscape
Turned sideways, the iPhone 15 Pro Max is 932 px wide and the Galaxy S24 Ultra 832 px; (min-width: 840px) matches only the iPhone 15 Pro Max in landscape. The visible height drops to about 380 and 304 px, so a 64 px sticky header covers 17% and 21% of the screen — under the 25% at which MobileCheck flags fixed bars covering the page.
Different browser engines
The iPhone 15 Pro Max renders with WebKit (Safari's engine) and the Galaxy S24 Ultra with Chromium (Chrome's), so fonts, form controls and some CSS can differ on top of the size difference. Chrome DevTools draws every emulated device with Chromium, which hides WebKit-only problems — see how to test on an iPhone and on Android.
More about these devices
- iPhone 15 Pro Max viewport size — one screen for the iPhone 14 Pro Max / 15 Plus / 15 Pro Max / 16 Plus
- Galaxy S24 Ultra viewport size — one screen for the Samsung Galaxy S24 / S25 Ultra / A15 / A54 / A55
Or open the free check with the iPhone 15 Pro Max and the Galaxy S24 Ultra preselected: full-page screenshots in WebKit and Chromium, with problems such as small text and crowded buttons highlighted.
Related comparisons
- iPhone 16 Pro vs Galaxy S24 Ultra — 402 vs 384 px wide, 3× vs 2.813×
- iPhone 16 Pro Max vs Galaxy S24 Ultra — 440 vs 384 px wide, 3× vs 2.813×
- iPhone 14 vs Galaxy A54 — 390 vs 384 px wide, 3× vs 2.813×
- iPhone SE vs Galaxy A15 — 375 vs 384 px wide, 2× vs 2.813×
- iPhone 15 Pro vs iPhone 15 Pro Max — 393 vs 430 px wide, 3× vs 3×
- iPhone 15 Pro Max vs iPhone 16 Pro Max — 430 vs 440 px wide, 3× vs 3×
Compare other devices → · All mobile viewport sizes →
Frequently asked questions
Is the iPhone 15 Pro Max screen bigger than the Galaxy S24 Ultra?
In CSS pixels, which decide how much of a page fits, the iPhone 15 Pro Max is larger: 430 × 932 against 384 × 832. The iPhone 15 Pro Max has more physical pixels (1290 × 2796), which makes it sharper rather than roomier.
Do I need different CSS for the iPhone 15 Pro Max and the Galaxy S24 Ultra?
Only if your breakpoints fall between 384 and 430 px: a min-width query at 390px or 414px or 430px applies to one and not the other. A fluid layout handles both without device-specific rules.
How much of a web page is visible on the iPhone 15 Pro Max vs the Galaxy S24 Ultra?
About 430 × 742 CSS px on the iPhone 15 Pro Max and 384 × 736 on the Galaxy S24 Ultra when a page first opens in portrait, after the status bar and the browser's bars. Bar heights are our device profiles' estimates.