How does iPhone Duo compare with iPhone Air?

iPhone Duo: 5.2 mm open · 11.3 mm closed. iPhone Air: 5.64 mm. See the two drawn to scale on the head-to-head page.

Quick answer · October 2026

The thinnest iPhone

Which iPhone is the thinnest? iPhone Duo, of the iPhones Apple sells today (5.2 mm open · 11.3 mm closed). Ranked by depth in millimetres. For iPhone Duo we count it unfolded; folded it is 11.3 mm.

By chaogetalks · Updated October 16, 2026 · Figures from Apple's technical specifications

Full ranking

Every iPhone, ranked.

#	Model	Figure	Sold new	Compare
1	iPhone Duo	5.2 mm open · 11.3 mm closed	Yes	—
2	iPhone Air	5.64 mm	Yes	vs Duo
3	iPhone SE (3rd generation)	7.3 mm	No	vs Duo
4	iPhone SE (2nd generation)	7.3 mm	No	vs Duo
5	iPhone 12 Pro Max	7.4 mm	No	vs Duo
6	iPhone 12 Pro	7.4 mm	No	vs Duo
7	iPhone 12	7.4 mm	No	vs Duo
8	iPhone 12 mini	7.4 mm	No	vs Duo
9	iPhone 13 Pro Max	7.65 mm	No	vs Duo
10	iPhone 13 Pro	7.65 mm	No	vs Duo
11	iPhone 13	7.65 mm	No	vs Duo
12	iPhone 13 mini	7.65 mm	No	vs Duo
13	iPhone 17e	7.8 mm	Yes	vs Duo
14	iPhone 16e	7.8 mm	No	vs Duo
15	iPhone 16	7.8 mm	Yes	vs Duo
16	iPhone 16 Plus	7.8 mm	No	vs Duo
17	iPhone 15 Plus	7.8 mm	No	vs Duo
18	iPhone 15	7.8 mm	No	vs Duo
19	iPhone 14 Plus	7.8 mm	No	vs Duo
20	iPhone 14	7.8 mm	No	vs Duo
21	iPhone 14 Pro Max	7.85 mm	No	vs Duo
22	iPhone 14 Pro	7.85 mm	No	vs Duo
23	iPhone 17	7.95 mm	Yes	vs Duo
24	iPhone 11 Pro Max	8.1 mm	No	vs Duo
25	iPhone 11 Pro	8.1 mm	No	vs Duo
26	iPhone 16 Pro Max	8.25 mm	No	vs Duo
27	iPhone 16 Pro	8.25 mm	No	vs Duo
28	iPhone 15 Pro Max	8.25 mm	No	vs Duo
29	iPhone 15 Pro	8.25 mm	No	vs Duo
30	iPhone 11	8.3 mm	No	vs Duo
31	iPhone 18 Pro Max	8.75 mm	Yes	vs Duo
32	iPhone 18 Pro	8.75 mm	Yes	vs Duo
33	iPhone 17 Pro Max	8.75 mm	No	vs Duo
34	iPhone 17 Pro	8.75 mm	No	vs Duo

Figures from Apple's technical specifications for each model; prices are Apple US starting prices, checked October 2026.

FAQ

Questions people ask

Which iPhone is the thinnest?: iPhone Duo — 5.2 mm open · 11.3 mm closed. Next among current models is iPhone Air (5.64 mm).
How does iPhone Duo compare with iPhone Air?: iPhone Duo: 5.2 mm open · 11.3 mm closed. iPhone Air: 5.64 mm. See the two drawn to scale on the head-to-head page.