Apple iPhone X vs. Samsung Galaxy A51

Phone Comparison, Reviews and Tests

In depth comparison and review of Apple iPhone X and Samsung Galaxy A51. Compare sizes, cameras, batteries, memory, and other important specifications and features to easily choose the right phone for you. Our goal is to help you uncover differences between the products and find the phone that will best fit your needs.

Phone Specifications Comparison

Apple iPhone X vs. Samsung Galaxy A51 Comparison Chart
DESIGN AND DIMENSIONS Apple iPhone X Samsung Galaxy A51
Product Type Smartphone Smartphone
Manufacturer Model Number A1901 SM-A515F/DSN
Form Factor Touch Touch
Height 143.6 mm 158.5 mm Samsung Galaxy A51 has greater height than Apple iPhone X.
Width 70.9 mm 73.6 mm Samsung Galaxy A51 has greater width than Apple iPhone X.
Depth 7.7 mm 7.9 mm Apple iPhone X is narrower than Apple iPhone X.
Weight 174 g 172 g Samsung Galaxy A51 is lighter than Apple iPhone X.
Body Colour Space grey | Silver Silver | Prism crush black | Haze crush silver | Prism crush blue | Prism crush white
Body Material Glass, oleophobic coating, surgical‑grade stainless steel -
Protection Dustproof, splashproof, waterproof -
Waterproof (Water-resistant) Yes - Apple iPhone X is waterproof.
IP rating IEC 60529 IP67 -
Repairability Index 4.8 (out of 10) -
SAR Value 1.17 W/kg (body), 1.08 W/kg (head) 0.369 W/kg (head), 1.59 W/kg (body), 2.93 W/kg (limb)
Connector Type Lightning USB Type-C - 24 pin USB-C
Headset jack - mini-phone 3.5mm
SIM Card Type (Size) Nano SIM Nano SIM
SIM Card Qty Single-SIM Dual-SIM
DISPLAY Apple iPhone X Samsung Galaxy A51
Display Type OLED display OLED display
Display Technology Super Retina HD Super AMOLED
Screen Size (Display Size) 5.8" 6.5" Samsung Galaxy A51 has larger screen size than Apple iPhone X.
Screen Resolution (Display Resolution) 2436 x 1125 pixels 2400 x 1080 pixels Apple iPhone X has better screen resolution than Samsung Galaxy A51.
Display Format - Full HD+
Pixel Density 458 ppi 408 ppi Apple iPhone X has better pixel density than Samsung Galaxy A51.
Max Brightness 625 cd/m² -
Colour Depth - 16.7 million colours
Contrast Ratio 1000000:1 -
HDR Yes - Apple iPhone X has HDR.
HDR Technology HDR10 -
Display Enhancement Technology Dolby Vision -
Display Features True Tone display Edge-to-Edge screen, Infinity O display
Display Protection (Screen Protector) Fingerprint-resistant oleophobic coating -
PROCESSOR Apple iPhone X Samsung Galaxy A51
Processor Type (CPU) Apple A11 Bionic - with M11 motion Samsung Exynos 9611
Clock Speed - 2.3 GHz
Processor Core Qty - 8-core
64-bit Architecture Yes Yes Both phones have 64-bit architecture.
MEMORY Apple iPhone X Samsung Galaxy A51
RAM - 4 GB
Internal Memory Size (Storage Capacity) 64 GB 128 GB Samsung Galaxy A51 has more internal memory than Apple iPhone X.
User Memory - 107 GB
Supported Flash Memory Cards (Expandable Memory) - microSDHC, microSDXC - up to 512 GB
CAMERA Apple iPhone X Samsung Galaxy A51
MAIN CAMERA
Number of Main Cameras 2 4
Sensor Resolution 12 Megapixel 48 Megapixel Samsung Galaxy A51 has better camera resolution than Apple iPhone X.
Sensor Type BSI -
Lens Type Wide-angle lens -
Lens Aperture F/1.8 F/2.0 Apple iPhone X has better lens aperture than Apple iPhone X.
Lens Construction 6-element -
Optical Image Stabiliser (OIS) Dual OIS (Optical Image Stabilisation) - Apple iPhone X has optical stabilisation.
Focus Adjustment Automatic Automatic
Digital Zoom 10x 8x Apple iPhone X has better digital zoom than Samsung Galaxy A51.
HDR Mode Auto HDR mode -
Camera Modes Burst mode, Panorama, Time-lapse mode, Timer mode, tap to focus, portrait mode, Portrait Lighting (beta), Live Photos, Live Photos with stabilisation Slow motion mode, Live Focus mode
Face Recognition (Face ID) Body and face detection - Apple iPhone X has face detection.
Light Source True Tone quad LED flash LED flash
Video Resolutions 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1920 x 1080 (1080p) at 120 fps, 3840 x 2160 (4K) at 30 fps, 3840 x 2160 (4K) at 60 fps, 3840 x 2160 (4K) at 24 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps
Camera Features (Functions) Sapphire crystal lens cover, Cinematic video stabilisation, Focus Pixels, Cinematic video stabilisation, Playback zoom, Hybrid IR filter, Exposure control, noise reduction, geotagging, Continuous Auto Focus (CAF) AR sticker, background blur, Scene Optimiser, Eye blink, Flaw detection, Stamp, Facial blur
SECOND CAMERA
Sensor Resolution (2nd Camera) 12 Megapixel 12 Megapixel Both phones have the same second camera resolution.
Lens Type (2nd Camera) Telephoto lens Ultra wide-angle lens
Lens Aperture (2nd Camera) F/2.4 F/2.2 Samsung Galaxy A51 has better second camera lens aperture than Apple iPhone X.
Field of View (2nd Camera) - 123 degree(s)
Camera Functions (2nd Camera) Capture depth information -
THIRD CAMERA
Sensor Resolution (3rd Camera) - 5 Megapixel
Lens Aperture (3rd Camera) - F/2.4
Camera Functions (3rd Camera) - Macro camera
FOURTH CAMERA
Sensor Resolution (4th Camera) - 5 Megapixel
Lens Type (4th Camera) - Telephoto lens
Lens Aperture (4th Camera) - F/2.2
Camera Functions (4th Camera) - Depth camera
FRONT CAMERA
Number of Front Cameras 2 1
Sensor Resolution (Front) 7 Megapixel 32 Megapixel Samsung Galaxy A51 has better front camera resolution than Apple iPhone X.
Sensor Type (Front) BSI -
Lens Aperture (Front) F/2.2 F/2.2 Both phones have the same front camera lens aperture.
Focus Adjustment - Focus free
HDR Mode (Front) Auto HDR mode -
Camera Modes (Front) Burst mode, Timer mode, portrait mode, Portrait Lighting (beta), Live Photos -
Face Recognition (Face ID) Body and face detection, face recognition - Apple iPhone X has face detection.
Light Source (Front) Retina Flash -
Video Resolutions (Front) 1920 x 1080 (1080p) -
Camera Features (Front) FaceTime HD camera, Exposure control, Auto image stabilisation, Animoji -
SECOND FRONT CAMERA
Camera Functions (2nd Front) Infrared camera for Face ID -
Camera Features (2nd Front) Flood Illuminator, Dot Projector -
BATTERY AND CHARGING Apple iPhone X Samsung Galaxy A51
Battery Capacity (Battery Size) - 4000 mAh
Fast Charging Technology Apple fast charging technology - Apple iPhone X has fast charging technology.
Wireless Charging Yes - Apple iPhone X can be charged wirelessly.
Wireless Charging Standards Qi -
Talk Time 1260 minutes 1920 minutes Samsung Galaxy A51 has longer battery life when making calls than Apple iPhone X.
Run Time Details Talk: up to 1260 min
Active online usage: up to 12 hrs
Playback (wireless video): up to 13 hrs
Playback (wireless audio): up to 60 hrs
Active online usage (LTE): up to 15 hrs
Active online usage (Wi-Fi): up to 16 hrs
Playback (video): up to 20 hrs
Playback (audio): up to 87 hrs
Talk (4G): up to 1920 min
Battery Technology Lithium Ion Lithium Ion
CELLULAR Apple iPhone X Samsung Galaxy A51
Technology WCDMA (UMTS) / GSM WCDMA (UMTS) / GSM
Mobile Broadband Generation 4G 4G Both phones have the same mobile network generation.
Operating System iOS 11 Android 10
User Interface - One UI
Intelligent Assistant Siri Bixby
Payment Technology Apple Pay -
Navigation A-GPS, GLONASS, Galileo, QZSS GPS, GLONASS, BeiDou, Galileo
COMMUNICATIONS Apple iPhone X Samsung Galaxy A51
Data Transmission GPRS, EDGE, HSDPA, HSUPA, HSPA+, LTE, DC-HSDPA, LTE Advanced, VoLTE, FDD-LTE, TDD-LTE, VoWiFi GPRS, EDGE, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE
2G Band 850 GSM, 900 GSM, 1800 GSM, 1900 GSM 850 GSM, 900 GSM, 1800 GSM, 1900 GSM
3G UMTS Band - Band 1, Band 2, Band 4, Band 5, Band 8
3G UMTS Frequency - 2100, 1900, 1700, 850, 900
4G LTE Band Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 17, Band 18, Band 19, Band 20, Band 25, Band 26, Band 28, Band 29, Band 30, Band 34, Band 38, Band 39, Band 40, Band 41, Band 66 Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 17, Band 20, Band 26, Band 28, Band 38, Band 40, Band 41, Band 66
4G LTE Frequency FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700c, FDD 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 1900+, FDD 850+, FDD 700 APT, FDD 700d, FDD 2300 WCS, TDD 2000, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700c, FDD 700b, FDD 800 DD, FDD 850+, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3
Wireless Interface IEEE 802.11ac IEEE 802.11a/b/g/n/ac, ANT+
Bluetooth Bluetooth 5.0 Bluetooth 5.0 LE
Bluetooth Profiles - HFP, HSP, OPP, PAN, A2DP, AVRCP, HID, SAP, PBAP, MAP, HOGP
NFC Yes Yes Both phones have an NFC reader for mobile payments.
Messaging Services SMS, MMS SMS, MMS
MEDIA Apple iPhone X Samsung Galaxy A51
Supported Digital Audio Standards Audible, MP3, FLAC, Apple Lossless, AC-3, AAC-LC, LPCM, HE-AAC, Audible AAX, Audible AAX+, protected AAC, EAC3, HE-AAC v2 WAV, WMA, AAC, AMR, MP3, FLAC, XMF, OGG, MIDI, M4A, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, MID
Supported Digital Video Standards M-JPEG, H.264, HEVC, MPEG-4 Part 2, HEIF MKV, FLV, AVI, WMV, ASF, 3GP, M4V, WebM, 3G2, MP4
FEATURES Apple iPhone X Samsung Galaxy A51
Phone Functions Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert
Sensors Accelerometer, ambient light sensor, proximity sensor, 3-axis gyro sensor, digital compass, barometer Accelerometer, ambient light sensor, proximity sensor, gyro sensor, hall sensor, geomagnetic sensor
Security Devices Face recognition Fingerprint reader (under display)
Security Technology Face ID -
Additional Phone Features Multitasking, FaceTime, AirPrint wireless printing, iCloud Photo Sharing, AirDrop function, MIMO technology, Wi-Fi Calling, iBeacon microlocation, CarPlay function, QuickType keyboard, Handoff, HomeKit, Apple TV support (2nd or later), Fast Charging, AirPlay 2 wireless streaming, M11 motion coprocessor, Neural Engine Fast Charging, Samsung KNOX, Bixby Vision, Game Booster, Bixby Routines
OTHERS Apple iPhone X Samsung Galaxy A51
Included Accessories Power adapter, Apple EarPods with Lightning Connector, Lightning to USB cable Power adapter
Compliant Standards IEC 60529 IP67, HAC (Hearing Aid Compatible) -
Max Operating Temperature 35 °C -
Min Operating Temperature 0 °C -
Humidity Range Operating 5 - 95% (non-condensing) -
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