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The device
What is the iPhone Duo?
Apple's first foldable iPhone. It has a 5.4 inch outer screen and a 7.6 inch inner screen. Announced , preorders opened , ships , from $1,999.
Why it matters for websites
- The viewport is about 466 px wide folded and about 890 px unfolded.
- Unfolding jumps the page from one width to the other in one step.
- Widths in between, and the new landscape inner screen, break layouts that only tested for phone and tablet.
- Safari has no API for the fold.
By the numbers
Specs Estimates
Apple has not published CSS viewports. These are third-party estimates and may change after the 2026-10-23 release.
Folded
- CSS viewport
- 466 x 678 px
- Device pixel ratio
- 3x
- Physical pixels
- 1398 x 2034
- Diagonal
- 5.4 in
- Aspect
- 0.69 (width / height)
Unfolded
- CSS viewport
- 890 x 626 px
- Device pixel ratio
- 3x
- Physical pixels
- 2670 x 1878
- Diagonal
- 7.6 in
- Aspect
- 1.42 (width / height)
Split View
- Safari width
- about 445 px