466 × 678 viewport: which devices use it?
466 × 678CSS px · 13.1:9
466 × 678 is the CSS viewport of 1 device in our research, including the iPhone Duo — outer screen. Turned sideways it becomes 678 × 466.
| Device | CSS viewport | DPR | Physical pixels | Year |
|---|---|---|---|---|
| iPhone Duo — outer screen | 382×678 | 3 | 1398×2034 | 2026 |
Note: on the iPhone Duo’s outer screen a web page gets 382px of this width; the rest is a system strip.
Check your site at 466 × 678
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Designing for 466px wide
Breakpoints
Tailwind: base styles only (below sm, 640px). Bootstrap: xs. Sideways (678px): Tailwind sm (sm: styles apply).
Room for content
434px with 16px side padding, 418px with 24px. Anything fixed wider than 466px makes the page scroll sideways (how to fix it).
Questions people ask
Which phone has a 466 × 678 viewport?
iPhone Duo — outer screen.
Is 466 × 678 the screen resolution?
No, it’s the viewport in CSS pixels. The physical screen has more pixels: the iPhone Duo — outer screen is 1398 × 2034 (DPR 3).
Which breakpoint does a 466px wide screen use?
Tailwind CSS: base styles only (below sm, 640px). Bootstrap: xs.
Guides that help
- What is a viewport? CSS pixels vs screen resolutionA viewport is the area your page is laid out in, measured in CSS pixels, not screen pixels. See real numbers from iPhones and MacBooks, then check yours.Guides · 8 min read
- How to fix horizontal scrolling on mobile (12 causes)Page wobbles sideways on phones? The 12 usual causes of horizontal scrolling on mobile, a fix for each, and a console snippet that finds the culprit fast.Fixes · 9 min read
- Responsive breakpoints in 2026 — the widths that matterWhere 123 real phones, tablets, laptops and monitors land in CSS pixels, which responsive breakpoints actually matter in 2026, and which screens to test.Guides · 8 min read