Apple iPhone X vs vivo X21 UD: specs comparison

Key differences

Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

Weight

X21 UD: 17.8 g lighter

iPhone X:

174 g

X21 UD:

156.2 g
Width

iPhone X: 3.9 mm narrower

iPhone X:

70.9 mm

X21 UD:

74.8 mm
Screen diagonal

iPhone X: 0.48 in smaller diagonal

iPhone X:

5.8 in

X21 UD:

6.28 in
Chipset

iPhone X:

Apple A11 Bionic (10 nm)

X21 UD:

Qualcomm SDM660 Snapdragon 660 (14 nm)
Height

iPhone X: 10.9 mm shorter

iPhone X:

143.6 mm

X21 UD:

154.5 mm
Release year

iPhone X:

2017

X21 UD:

2018

Physical size

Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

1. iPhone X

Height:

143.6 mm
Width:

70.9 mm
Depth:

7.7 mm
2. X21 UD

Height:

154.5 mm +10.9 mm versus iPhone X
Width:

74.8 mm +3.9 mm versus iPhone X
Depth:

7.4 mm

Weight

Bars start at zero and share a scale within this chart.

1. iPhone X

174 g

+17.8 g versus X21 UD
2. X21 UD

156.2 g

Screen size

Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

1. iPhone X

Screen diagonal:

5.8 in

Aspect ratio (height:width):

19.5:9

Approximate rectangular screen area:

82.6 cm²
2. X21 UD

Screen diagonal:

6.28 in

Aspect ratio (height:width):

19:9

Approximate rectangular screen area:

98.4 cm²

X21 UD has approximately 19.2% more rectangular screen area than iPhone X.

Memory variants

Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

Recorded RAM for iPhone X, X21 UD, compared at the same storage capacity.
Storage	iPhone X	X21 UD
64 GB	3 GB RAM	Not recorded
128 GB	Not recorded	6 GB RAM
256 GB	3 GB RAM	Not recorded

Practical features

Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

1. iPhone X

NFC:: Yes
Headphone jack:: No
Memory card support:: No

2. X21 UD

NFC:: Unknown
Headphone jack:: Yes
Memory card support:: See details microSD · up to 256 GB (uses SIM 2 slot)

Battery capacity

Capacity is not battery life. No endurance test is implied.

Recorded battery capacity

Bars start at zero and share a scale within this chart.

1. iPhone X

2716 mAh
2. X21 UD

3200 mAh

+484 mAh versus iPhone X

Specifications

Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.

1. iPhone X2. X21 UD

Everyday essentials

Everyday essentials — specifications for iPhone X, X21 UD.
Specification	iPhone X	X21 UD
Dimensions (HxWxD)	143.6 Х 70.9 Х 7.7 mm	154.5 Х 74.8 Х 7.4 mm
Weight	174 g	156.2 g
Technology	Super AMOLED	Super AMOLED
Screen size	5.8" inch	6.28" inch
Screen resolution	1125 x 2436 px	1080 x 2280 px
Internal memory Recorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.	64/256 GB 3 GB RAM	128 GB 6 GB RAM
Memory card support	No	microSD up to 256 GB (uses SIM 2 slot)
Battery Capacity is not battery life. No endurance test is implied.	2716 mAh Non-removable Li-Ion	3200 mAh Non-removable Li-Ion
Operating system OS	iOS 11.1.1 upgradable to iOS 12.1.3	Android 8.1 (Oreo); Funtouch 4
Chipset	Apple A11 Bionic (10 nm)	Qualcomm SDM660 Snapdragon 660 (14 nm)
NFC	Yes	Unknown
Headphone jack	No	Yes

Display

Display — specifications for iPhone X, X21 UD.
Specification	iPhone X	X21 UD
Touchscreen	capacitive touchscreen	capacitive touchscreen
Display colors	16M	16M
Screen area	84.4 cm2	98.4 cm2
Screen format	19.5:9 (height:width)	19:9 (height:width)
Screen to body ratio	82.9%	85.2%
PPI /points per inch/	458 PPI	402 PPI
Screen protection	Scratch-resistant glass oleophobic coating	Unknown

Camera and Video

Scores marked * are historical catalogue entries. Test conditions are unspecified; no new testing is implied.

Camera and Video — specifications for iPhone X, X21 UD.
Specification	iPhone X	X21 UD
Rear camera, main	12 MP Dual	12 MP Dual
Camera specs	12 MP f/1.8 28mm (wide) 1/3'' 1.22µm OIS PDAF -12 MP f/2.4 52mm (telephoto) 1/3.4'' 1.0µm PDAF 2x optical zoom	12 MP f/1.8 1/2.55'' 1.4µm dual pixel PDAF -5 MP f/2.4 depth sensor
Functions	HDR	LED flash HDR panorama
Video	1080p@30fps	1080p@30fps
Front camera, selfie	7 MP Single	12 MP Single
Specifications	7 MP f/2.2 32mm (standard)	12 MP f/2.0
DxOMark Main Score *	97	Unknown
DxOMark Photo *	74	Unknown
DxOMark Video *	66	Unknown
DxOMark Selfie Score *	71	Unknown

Performance

Scores marked * are historical catalogue entries. Test conditions are unspecified; no new testing is implied.

Performance — specifications for iPhone X, X21 UD.
Specification	iPhone X	X21 UD
Processor CPU	Hexa-core 2.39 GHz (2x Monsoon + 4x Mistral)	Octa-core (4x2.2 GHz Kryo 260 & 4x1.8 GHz Kryo 260)
Graphics processor GPU	Apple GPU (three-core graphics)	Adreno 512
Antutu 7 score *	245200	143592
GeekBench 4 Single Core *	3226	Unknown
GeekBench 4 Multi-Core *	11951	Unknown
Antutu 8 score *	316142	Unknown

General specs

General specs — specifications for iPhone X, X21 UD.
Specification	iPhone X	X21 UD
Release date	2017 September	2018 March
Colors	Space Gray Silver	Black Ruby Red
Historical recorded price Legacy catalogue value; date unknown. Not a current offer.	1000 EUR	550 EUR
Battery life	Talking time- Up to 21 h (3G) Music play - Up to 60 h	Unknown
Body build	Front/back glass stainless steel frame	Front glass aluminum body

Communication and Connectivity

Communication and Connectivity — specifications for iPhone X, X21 UD.
Specification	iPhone X	X21 UD
SIM card	Nano-SIM	Hybrid Dual SIM (Nano-SIM dual stand-by)
Network	Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 -3G - HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 -4G - LTE band 1(2100) 2(1900) 3(1800) 4(1700/2100) 5(850) 7(2600) 8(900) 12(700) 13(700) 17(700) 18(800) 19(800) 20(800) 25(1900) 26(850) 28(700) 29(700) 30(2300) 34(2000) 38(2600) 39(1900) 40(2300) 41(2500) 66(1700/2100)	Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA 800 & TD-SCDMA -3G - HSDPA 850 / 900 / 1900 / 2100 -4G - LTE band 1(2100) 2(1900) 3(1800) 5(850) 8(900) 34(2000) 38(2600) 39(1900) 40(2300) 41(2500)
Speed	HSPA 42.2/5.76 Mbps LTE-A (3CA) Cat12 600/150 Mbps EV-DO Rev.A 3.1 Mbps	HSPA 42.2/5.76 Mbps LTE-A (2CA) Cat6 300/50 Mbps
GPRS	Yes	Yes
Edge	Yes	Yes
Wi-Fi	Wi-Fi 802.11 a/b/g/n/ac dual-band hotspot	Wi-Fi 802.11 a/b/g/n/ac dual-band WiFi Direct hotspot
GPS	Yes with A-GPS GLONASS GALILEO QZSS	Yes with A-GPS GLONASS
USB	2.0 proprietary reversible connector	microUSB 2.0 USB On-The-Go
Bluetooth	5.0 A2DP LE	5.0 A2DP LE
Harmful irradiation	SAR - 1.09 W/kg (head) 1.17 W/kg (body)	Unknown

Music and Audio

Music and Audio — specifications for iPhone X, X21 UD.
Specification	iPhone X	X21 UD
Radio	No	FM radio
Others	Dolby Vision -HDR10 -Wide color gamut -3D Touch -True-tone -120 Hz touch-sensing Active noise cancellation with dedicated mic	32-bit/192kHz audio -Active noise cancellation with dedicated mic

Other features

Other features — specifications for iPhone X, X21 UD.
Specification	iPhone X	X21 UD
Dop	Sensors Face ID accelerometer gyro proximity compass barometer - Fast battery charging: 50% in 30 min -Qi wireless charging -Siri natural language commands and dictation - IP67 dust/water resistant (up to 1m for 30 mins) -Apple Pay (Visa MasterCard AMEX certified) - Also known as Apple iPhone 10 Apple iPhone Ten Versions: A1865 (USA Hong Kong Australia New Zealand China) A1901 (EMEA UAE LATAM Canada USA AT&T/T-Mobile Singapore)	Sensors Fingerprint (under display) accelerometer proximity compass - Fast battery charging

Apple iPhone X vs vivo X21 UD

Apple iPhone X

vivo X21 UD