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Apple iPhone Duo vs Apple iPhone X

Every spec side by side, from each maker's published figures.

Better figure, where one is clearly better

AppleiPhone DuoAppleiPhone X
Overview
ReleasedComing 23 October 2026November 2017
Display
Main screen7.6″5.8″
Resolution2670 × 18782436 × 1125
Sharpness430 pixels per inch463 pixels per inch
PanelLTPO OLEDOLED
Refresh rate120 Hz60 Hz
Peak brightness3,000 nits625 nits
Cover screen5.4″, 2034 × 1398, 120 Hz–
Display typeSuper Retina XDR OLED folding display (inner) with nano-texture finish and wide-angle OLEDs; Dynamic Island on both displaysSuper Retina HD display; 5.8-inch (diagonal) all-screen OLED Multi-Touch display with rounded corners; 5.85 inches measured as a standard rectangle
Pixel density430 ppi (inner); 460 ppi (outer)458 ppi
Brightness detailBoth displays 1,000 nits max (typical); 1,600 nits peak (HDR); 3,000 nits peak (outdoor); 1 nit minimum625 cd/m² max brightness (typical)
Always-on displayYes–
Screen protectionCeramic Shield 2 on the outer display, Ceramic Shield back; inner display has a scratch-resistant coating over a nano-textured custom polymer cover layer, high-strength glass above and below the panel and a titanium plate beneathFingerprint-resistant oleophobic coating
Display featuresProMotion adaptive refresh up to 120 Hz; HDR; True Tone; Wide colour (P3); Haptic Touch; 2,000,000:1 contrast ratio (typical); anti-reflective coating; Apple Pencil (USB-C) support on either display, which Apple says is coming later in 2026HDR display; True Tone; wide colour display (P3); 3D Touch; 1,000,000:1 contrast ratio (typical)
Cover screen5.4-inch Super Retina XDR OLED, 1398 x 2034 at 460 ppi, ProMotion up to 120 Hz, same aspect ratio as the inner display; measured as a standard rectangle the screens are 7.58 and 5.36 inches–
Performance
ChipA20 ProA11 Bionic
Memory–3 GB
Storage256 GB, 512 GB, 1 TB, 2 TB64 GB, 256 GB
CPU6-core CPU with 2 super cores and 4 efficiency cores; 2-nanometre processA11 Bionic chip with 64-bit architecture and embedded M11 motion coprocessor; six-core 2.39 GHz (2x Monsoon + 4x Mistral) (GSMArena); 3 GB of SK hynix LPDDR4X RAM (iFixit)
GPU7-core GPU with Neural Accelerators; hardware-accelerated ray tracingApple-designed three-core GPU (GSMArena)
AI engineDual 16-core Neural EngineNeural Engine
CoolingCustom vapour chamber connected directly to the chip package; up to 35% better sustained performance than iPhone 17 Pro (Apple)–
Cameras
Main camera48 MP12 MP
Ultra wide camera48 MPNone
Telephoto cameraNone12 MP
Optical zoomNone2×
Front camera12 MP7 MP
Main camera48MP Fusion Main, 26 mm, ƒ/1.6 aperture, sensor-shift optical image stabilisation, Hybrid Focus Pixels; 24MP and 48MP photos12MP wide-angle, ƒ/1.8 aperture, optical image stabilisation, six-element lens, quad-LED True Tone flash with Slow Sync
Telephoto camera–12MP telephoto, ƒ/2.4 aperture, optical image stabilisation, 2x optical zoom (GSMArena)
Ultra wide camera48MP Fusion Ultra Wide, 13 mm, ƒ/2.2 aperture, 120° field of view, Hybrid Focus Pixels; 24MP and 48MP photos–
Front camera12MP Center Stage camera (outer), ƒ/2.2 aperture; under-display FaceTime camera in the inner display, ƒ/1.8 aperture, 1080p video (resolution in megapixels not published)7MP TrueDepth camera, ƒ/2.2 aperture, Retina Flash
Zoom12MP optical-quality 2x Telephoto (52 mm, ƒ/1.6) from the Main camera; 2x optical-quality zoom in, 2x optical zoom out (4x optical-quality zoom range); digital zoom up to 10x (6x for video)Optical zoom; digital zoom up to 10x (photos) and 6x (video)
Video recording4K Dolby Vision at 24, 25, 30 or 60 fps, and at 100 or 120 fps on the Fusion Main camera; 1080p Dolby Vision up to 120 fps; Cinematic mode up to 4K Dolby Vision at 60 fps, with effects applied after capture; Action mode up to 2.8K Dolby Vision at 60 fps; slo-mo 1080p up to 240 fps and 4K Dolby Vision up to 120 fps (Fusion Main); Dual Capture up to 4K Dolby Vision at 30 fps; macro video; HEVC and H.2644K at 24, 30 or 60 fps; 1080p at 30 or 60 fps; 720p at 30 fps; optical image stabilisation for video; slo-mo 1080p at 120 or 240 fps; time-lapse with stabilisation; 8MP stills while recording 4K
Front videoOuter camera 4K Dolby Vision at 24, 25, 30 or 60 fps, Cinematic mode up to 4K Dolby Vision at 30 fps, slo-mo 1080p at 120 fps; inner camera 1080p at 30 or 60 fps1080p HD
Camera featuresSmart Take; Duo Preview and Kid Cue on the outer display; Photographic Styles 3; smart focus tracking; Photonic Engine; Deep Fusion; Smart HDR 5; Night mode; next-generation portraits with Focus and Depth Control; panorama up to 63MP; 48MP macro photography; True Tone flash; sapphire crystal lens cover; Camera Control; HEIF and JPEG; no Pro controlsPortrait mode and Portrait Lighting (beta) on both rear and front cameras; Animoji; Live Photos with stabilisation; auto HDR; panorama (up to 63MP); HEIF and JPEG
Battery and charging
Battery–2,716 mAh
Video playback (maker's claim)Up to 31 hoursUp to 13 hours
Wireless chargingUp to 25 WYes (wattage not published)
Battery life detailTwo lithium-ion batteries, one in each half, managed as one; up to 24 hours typical use (equal use of both displays); video playback up to 31 hours on the inner display and 44 hours on the outer; streamed video up to 26 hours inner and 37 hours outerLasts up to 2 hours longer than iPhone 7; talk time up to 21 hours; internet use up to 12 hours; wireless video playback up to 13 hours; wireless audio playback up to 60 hours; 3.81 V, 10.35 Wh, 2,716 mAh (iFixit)
Wired chargingUp to 50% in around 20 minutes with a 60W-capable USB-C adapter or higher (sold separately); Apple doesn't give a maximum wattageUp to 50% in 30 minutes (fast-charge capable)
Wireless chargingMagSafe and Qi2 up to 25W; up to 50% in around 30 minutes with a 35W adapter or higher and a MagSafe ChargerWorks with Qi-certified chargers
Connectivity
Satellite messagingYes–
Mobile networkApple C2 modem; 5G (sub-6GHz) with 4x4 MIMO; Gigabit LTE with 4x4 MIMO; UK model A3720 (US model A3447 adds mmWave)Model A1901: UMTS/HSPA+/DC-HSDPA; GSM/EDGE; FDD-LTE (bands 1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 29, 30, 66); TD-LTE (bands 34, 38, 39, 40, 41); VoLTE; Wi-Fi calling
SIMDual eSIM only (two active, eight or more stored); no physical SIMNano-SIM (GSMArena)
Wi-FiWi-Fi 7 (802.11be) with 2x2 MIMO; Apple N1 wireless networking chipWi-Fi 802.11ac with MIMO
BluetoothBluetooth 6; ThreadBluetooth 5.0
Ultra WidebandApple second-generation Ultra Wideband chip–
NFCNFC with reader mode; Express Cards with power reserveNFC with reader mode
Satellite featuresEmergency SOS via satellite; Roadside Assistance via satellite; Find My via satellite; Messages via satellite in the US–
USBUSB-C with charging, DisplayPort and USB 3 (up to 10Gb/s); video out up to 4K HDRLightning connector; video mirroring and video out up to 1080p through the Lightning Digital AV Adapter and Lightning to VGA Adapter (sold separately)
PositioningPrecision dual-frequency GPS (GPS, GLONASS, Galileo, QZSS, BeiDou and NavIC); digital compass; iBeacon micro-locationAssisted GPS, GLONASS, Galileo and QZSS; digital compass; Wi-Fi; cellular; iBeacon microlocation
Design
TypeFoldableStandard
Weight254 g174 g
Thickness11.3 mm7.7 mm
Height × width117.8 × 84.1 mm143.6 × 70.9 mm
Water and dust resistanceIP68IP67
StylusYes–
Size unfolded117.8 × 164.6 × 5.2 mm (height × width × thickness)–
MaterialsGrade 5 titanium enclosure with a mirror-polished finish (85% recycled titanium); 3D-printed titanium hinge cover with a micro-blasted finish; Ceramic Shield backAll-glass front and back with a surgical-grade stainless steel band
ColoursStar White, Night SkySpace Grey, Silver
ButtonsSide button with Touch ID; Camera Control; volume up/down; no Action buttonSide button; volume buttons; Ring/Silent switch
Water resistance detailIP68 (maximum depth of 6 metres up to 30 minutes) under IEC standard 60529IP67 under IEC standard 60529
BiometricsTouch ID fingerprint sensor in the side buttonFace ID, enabled by the TrueDepth camera
SensorsTouch ID; barometer; high dynamic range gyro; high-g accelerometer; proximity sensor; four ambient light sensorsFace ID; barometer; three-axis gyro; accelerometer; proximity sensor; ambient light sensor
SpeakersBuilt-in stereo speakers–
MicrophonesBuilt-in microphones; Voice Isolation and Wide Spectrum modes–
Software
Operating systemiOSiOS
Software at launchiOS 27.1 (Apple's press release; the spec page lists iOS 27)iOS 11
AI featuresApple Intelligence; Siri AI (beta, English at launch, not initially available in the EU); Siri Camera mode through Camera Control–
Safety featuresCrash Detection–
In the boxiPhone Duo, USB-C Charge Cable (1 m); no power adapter–

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