Compare iPhone models

iPhone Duo and iPhone 18 Pro side by side with the iPhone 17 and 16 families. Apple’s published figures, plus the trade-offs that actually change the buy.

Specs checked September 14, 2026. Figures are Apple’s published specifications and claims, not hands-on tests. We don’t list prices.

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iPhone Duo vs iPhone 18 Pro vs iPhone 17 Pro
Spec	iPhone Duo	iPhone 18 Pro	iPhone 17 Pro
Design
Form factor	Book-style foldable (Opens to a tablet-size canvas)	Slab	Slab
Materials	Grade 5 titanium (Ceramic Shield 2 on the outer display)	Aluminum unibody (Ceramic Shield 2 front)	Aluminum unibody (Ceramic Shield 2 front)
Weight	254 g (11.3 mm closed · 5.2 mm open)	211 g (150.0 × 71.9 × 8.75 mm)	206 g (150.0 × 71.9 × 8.75 mm)
Water and dust	IP68	IP68	IP68
Display
Screen size	7.6″ inner · 5.4″ outer (Apple: inner is 50% larger than 18 Pro Max)	6.3″	6.3″
Size at scale	Outer 5.4″, Inner 7.6″, open	6.3″	6.3″
Refresh and brightness	ProMotion up to 120Hz (Always On · up to 3000 nits · nano-texture inner)	ProMotion up to 120Hz (Always On · up to 3000 nits)	ProMotion up to 120Hz (Always On · up to 3000 nits)
Performance
Chip	A20 Pro (6-core CPU · 7-core GPU)	A20 Pro (6-core CPU · 7-core GPU)	A19 Pro (6-core CPU · 6-core GPU)
Camera
Main camera	48MP Fusion (ƒ/1.6 · optical-quality 2x)	48MP Fusion, variable aperture (ƒ/1.48 to ƒ/4)	48MP Fusion (ƒ/1.78)
Ultra Wide	48MP Fusion Ultra Wide	48MP Fusion Ultra Wide	48MP Fusion Ultra Wide
Telephoto	No Telephoto lens	48MP Fusion Telephoto, 4x (Up to 8x optical-quality)	48MP Fusion Telephoto, 4x (Up to 8x optical-quality)
Front camera	12MP Center Stage outside (Under-display FaceTime camera inside)	18MP Center Stage	18MP Center Stage
Stand-out features	Split View: two apps side by side; Smart Take, Duo Preview and Kid Cue; Under-display FaceTime camera	Variable aperture with six laser-cut blades; Apple Reference Image; Pro controls in the Camera app	ProRes RAW, Log 2 and genlock video; Vapor chamber cooling
Battery and charging
Video playback	31 h (Inner display), 44 h (Outer display); eSIM only worldwide	36 h (eSIM-only model), 34 h (With SIM tray)	33 h (eSIM-only model), 31 h (With SIM tray)
Wired fast charge	50% in about 20 min (60W-capable adapter or higher and USB-C cable)	Up to 50% in about 15 min (60W-capable AVS adapter or higher and USB-C cable)	50% in about 20 min (With a 40W adapter)
Wireless charging	MagSafe and Qi2, up to 25W	MagSafe and Qi2, up to 25W	MagSafe and Qi2, up to 25W
Security and connectivity
Unlock	Touch ID (In the side button, open or closed)	Face ID (In the redesigned Dynamic Island)	Face ID (Dynamic Island)
Buttons	Camera Control (No Action button)	Action button and Camera Control	Action button and Camera Control
SIM	eSIM only (Worldwide)	eSIM only in 12 markets (Including the U.S.; SIM tray elsewhere)	eSIM only in 12 markets (Including the U.S.; SIM tray elsewhere)
Cellular modem	Apple C2 (mmWave in the U.S.)	Apple C2 (mmWave in the U.S.)	Not listed
Wi-Fi and Bluetooth	Apple N1 (Wi-Fi 7 · Bluetooth 6 · Thread)	Apple N1 (Wi-Fi 7 · Bluetooth 6 · Thread)	Apple N1 (Wi-Fi 7 · Bluetooth 6 · Thread)
Apple Pencil	Apple Pencil (USB-C) (Support arrives later in 2026)	Not supported	Not supported
Storage and availability
Storage	256GB to 2TB	256GB to 2TB	256GB to 1TB
Availability	October 23 (Pre-order Oct 16 · more countries Oct 30)	September 18 (Pre-orders opened Sep 12 · more countries Sep 25)	Launched Sep 2025

Quick pick

Choose iPhone Duo if you want the largest iPhone canvas, Split View multitasking and Touch ID, and can wait for late October.
Choose iPhone 18 Pro if you want variable aperture, Pro controls and Face ID in a familiar slab, in hand from September 18.
Choose iPhone 17 Pro if you want the same 4x Telephoto range as 18 Pro and can live without variable aperture and A20 Pro.

Where to buy

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Every iPhone model on this page

iPhone Duo: The first foldable iPhone. Titanium, Touch ID, two displays.
iPhone 18 Pro: Variable-aperture Pro camera, Face ID and A20 Pro in a slab.
iPhone 18 Pro Max: The 18 Pro camera and A20 Pro in the 6.9″ body.
iPhone 17 Pro: Last year’s Pro: aluminum unibody, 4x Telephoto, A19 Pro.
iPhone 17 Pro Max: The 17 Pro camera system on a 6.9″ display.
iPhone Air: A 5.64 mm titanium body, 165 g and one rear camera.
iPhone 17: ProMotion, a 48MP Ultra Wide and an 18MP front camera.
iPhone 17e: The simplest current iPhone, now with MagSafe and 256GB to start.
iPhone 16 Pro Max: The 2024 Pro camera with 5x Telephoto on a 6.9″ display.
iPhone 16 Pro: Titanium Pro with a 12MP 5x Telephoto and A18 Pro.
iPhone 16 Plus: A 6.7″ iPhone 16 with the longer battery rating.
iPhone 16: Camera Control and the Action button in a 6.1″ iPhone.
iPhone 16e: Face ID, a 48MP camera and Apple’s first C1 modem.