iPhone Duo Crease Test: 48μm New, 167μm After 3,000 Folds
Reviewers measured the iPhone Duo's crease at 48μm fresh out of the box — about half the thickness of a sheet of paper, the shallowest any reviewer had ever scanned on a new foldable.
But creases deepen with use. After 3,000 folds the Duo measured 167μm, losing its lead to rivals. After 10,000 folds plus sub-zero testing, the hinge still worked like new — the crease just kept getting deeper. Expect the crease to get more visible over months, not days.
How deep is the crease on a brand-new iPhone Duo?
One reviewer put a brand-new Duo plus two rival foldables under a professional crease scanner, with a five-year-old foldable as reference. Peak-to-valley height:
| Phone | Crease depth (new) |
|---|---|
| iPhone Duo | 48μm — about half a sheet of paper |
| Rival foldable A | Deeper than Duo |
| Rival foldable B | Deeper than Duo |
| 5-year-old foldable | 350μm — clear W-shaped crease |
The slope across the crease — what your finger actually feels — measured under 0.1° on the new Duo, far flatter than the rivals. Out of the box, it is the best crease the industry has shipped.
What happens to the crease after 3,000 folds?
The same reviewer built a folding machine, folded all three phones 3,000 times, and re-scanned. Every crease got deeper — and the Duo lost its lead:
| Phone | After 3,000 folds |
|---|---|
| iPhone Duo | 167μm, slope 1.24° — worse than B, about even with A |
| Rival B | Shallower than Duo now |
| Rival A | About the same as Duo |
A second reviewer confirmed the trend independently: just 500 folds already made the crease visibly deeper than unboxing day, though in daily use the difference in look and touch was smaller than the numbers suggest.
Can it survive 10,000 folds?
影视飓风 went further: 10,000 continuous folds at room temperature, plus 1,000 folds at -20°C. Result: the hinge still opened with the same assisted smoothness as day one — but the crease kept deepening, exactly as expected. The hinge will likely outlive the display's cosmetic perfection.
Practical tip from the same test: foldables ship unfolded in the box for a reason — folded materials slowly deform under stress. If the crease bothers you, leave the phone open while charging.
Does the nano-texture layer really hide the crease?
Yes — and it's the Duo's standout trick. Most foldables have glossy screens where reflected light distorts across the crease and makes it shout. The Duo's nano-texture turns reflections diffuse, evening out the distortion so the display looks much flatter. MKBHD calls the inner display the hardware highlight of the phone.
The price: ambient light makes blacks look gray rather than truly dark, and the texture is a fingerprint magnet. 影视飓风 sent the surface to a lab for atomic-force microscopy: the texture's peaks and valleys are far deeper than regular nano-glass or matte screen protectors, so skin oil gets trapped in the grooves — some people's fingerprints are genuinely hard to wipe off.
Known pain points
- The crease you see on day one is the best it will ever look — it only deepens from there.
- The nano-texture layer that hides the crease is a fingerprint magnet: oil gets trapped in its microscopic grooves and is unusually hard to wipe off.
- Nano-texture scatters light, so blacks look gray instead of truly dark in bright rooms.
Quick answers
Will the iPhone Duo crease get worse over time?
Is the iPhone Duo crease visible?
How can I slow down crease deepening?
📺 Review sources (3) — every number above comes from these hands-on tests
More DUO Lab tests
Will the iPhone Duo Survive 10,000 Folds? · Is the iPhone Duo Worth $2,000?