iPhone Duo specs explained in plain English
Every line of Apple's iPhone Duo spec sheet, translated into what it actually means when you use the phone.
Apple's spec sheet for iPhone Duo is long, and a lot of it reads like a parts list. This guide walks through the numbers that matter and what each one changes in day-to-day use.
Design, size and weight
iPhone Duo comes in two finishes, Night Sky and Star White, with a titanium foldable design and Ceramic Shield 2 on the front. Open, it measures 117.8 mm tall, 164.6 mm wide and just 5.2 mm thick. Closed, it is 84.1 mm wide and 11.3 mm thick. It weighs 254 grams.
In practice: closed, it is narrower than a Pro Max-class phone and fits a pocket comfortably. Open, Apple says it is the thinnest iPhone ever. See the screen size breakdown for how that space is used.
Displays
- Inner display: 7.6-inch folding OLED, 1878 x 2670 pixels at 430 ppi, with a nano-texture finish that reduces glare.
- Outer display: 5.4-inch OLED, 1398 x 2034 pixels at 460 ppi.
- Both: ProMotion up to 120Hz, Always-On, Dynamic Island, 1000 nits typical, 1600 nits HDR peak and 3000 nits peak outdoors.
Chip, battery and charging
The A20 Pro has a 6-core CPU (2 super cores, 4 efficiency cores), a 7-core GPU with Neural Accelerators and a Dual 16-core Neural Engine. A vapor chamber handles heat. Battery life is rated up to 24 hours of typical use, and up to 44 hours of video playback on the outer display versus 31 hours on the inner one. Fast charging reaches about 50% in around 20 minutes with a 60W-capable adapter. More on that in our charging guide.
Cameras
On the back: a 48MP Fusion Main (26 mm, f/1.6) and a 48MP Fusion Ultra Wide (13 mm, f/2.2), with 2x optical-quality zoom and up to 10x digital. On the front: a 12MP Center Stage camera on the outer display and an under-display FaceTime camera on the inner one. Video goes up to 4K 120 fps Dolby Vision on the main camera. See the video recording breakdown.
Everything else
Touch ID in the side button (no Face ID), IP68 water and dust resistance, dual eSIM only, Wi-Fi 7, Bluetooth 6, USB-C with USB 3 speeds up to 10Gb/s and DisplayPort output, plus MagSafe and Qi2 at up to 25W. It ships with iOS 27 and storage options of 256GB, 512GB, 1TB and 2TB.
Recording on iPhone Duo? Try PromptSlate Studio
If one of those specs sold you on the camera, the fastest way to put it to work is PromptSlate Studio, our script, teleprompter and recording workspace built around the Duo's folding postures. See PromptSlate Studio for iPhone Duo.
Related iPhone Duo guides
From the maker
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See PromptSlate Studio details · Also in the works: DuoSketch
Spotted something to fix, or an app we should cover?
This article is independent research, cross-checked against Apple's developer documentation. If something's out of date, or you know an app that deserves a look, let us know — and if you're building for iPhone Duo yourself, we're happy to talk.
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