vivo X21 UD Specs, review, opinions, comparisons

Discover all the technical specs of the vivo X21 UD - from its camera and display to performance and battery life.
Added by on 03.22.18 | Last update 02.26.20
vivo X21 UD Specs, review, opinions, comparisons
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vivo X21 UD is a 2018 smartphone. It measures 154.5 x 74.8 x 7.4 mm and weighs 156.2 g. It has a Super AMOLED display measuring 6.28" inches. The resolution is 1080 x 2280 and 402 ppi pixel density.

There is Single front camera with 12 MP. The main camera is Dual with 12 MP.

It runs on Octa-core (4x2.2 GHz Kryo 260 & 4x1.8 GHz Kryo 260) CPU with 128 GB, 6 GB RAM memory. The battery is 3200 mAh.

Scroll down and discover all the features and specs this device has to offer.

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vivo X21 UD specs

General specs

Brand and model

vivo X21 UD

Release date

2018, March


154.5 x 74.8 x 7.4 mm (6.08 x 2.94 x 0.29 in)


156.2 g (5.51 oz)

Body build

Front glass, aluminum body


Black, Ruby Red


3200 mAh,  Non-removable Li-Ion

Approximate price550 EUR





capacitive touchscreen

Display colors


Screen size

6.28" inc

Screen area

98.4 cm2

Screen format

19:9 (height:width)

Screen to body ratio


Screen resolution

1080 x 2280 px

PPI /points per inch/

402 PPI

Camera and Video

Rear camera, main

12 MP, Dual

Camera specs

-12 MP, f/1.8, 1/2.55'', 1.4µm, dual pixel PDAF
-5 MP, f/2.4, depth sensor


LED flash, HDR, panorama

Video 1080p@30fps
Front camera, selfie

12 MP, Single


12 MP, f/2.0

Video 1080p@30fps


Operating system OS

Android 8.1 (Oreo); Funtouch 4


- Qualcomm SDM660 Snapdragon 660 (14 nm)

Processor CPU

- Octa-core (4x2.2 GHz Kryo 260 & 4x1.8 GHz Kryo 260)

Graphics processor GPU

- Adreno 512

External memory

microSD, up to 256 GB (uses SIM 2 slot)

Internal memory

128 GB, 6 GB RAM

Antutu 7 score 143592 (Rank 162 of 2087)

Communication and Connectivity

SIM card Hybrid Dual SIM (Nano-SIM, dual stand-by)
Network GSM / CDMA / HSPA / LTE
Show all network frequencies:
Speed HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps
Edge Yes
Wi-Fi Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot
USB microUSB 2.0, USB On-The-Go
Bluetooth 5.0, A2DP, LE

Music and Audio

Radio FM radio
Headphone jack Yes
- 32-bit/192kHz audio
-Active noise cancellation with dedicated mic

Other features

- Sensors - Fingerprint (under display), accelerometer, proximity, compass
- Fast battery charging
Disclaimer: The information provided here is based on publicly available information and official specifications from vivo. While every effort has been made to provide accurate and reliable information, readers should be aware that specifications are subject to change and updates from vivo may not be reflected.

vivo X21 UD Video review - click to play

Richard Taylor

Richard Taylor

Richard Taylor is a technology expert and journalist based in the UK. With a degree in Computer Science from the University of Birmingham, he provides insightful analysis and expert reviews of the latest smartphones and technology. His technical expertise, passion for technology and years of experience make him a trusted source in the industry.

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Frequently Asked Questions

The base approximate price of the vivo X21 UD was around 550 EUR after it was officially announced. At this point, the price may be lower.
The official release date is 2018, March.
The weight of the vivo X21 UD is 156.2 g.
The screen size of the vivo X21 UD is 6.28" inches.
The size of the vivo X21 UD is 154.5 x 74.8 x 7.4 mm (HxWxD).

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