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vivo X21 UD Specifications
Vivo
Released 2018, Mar 15
6 GB RAM · Qualcomm SDM660 Snapdragon 660 (14 nm)
- 156.2g, 7.4mm thickness
- Android 8.1, Funtouch 4
- 128GB storage, microSDXC
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Genze vs community
Genze and community ratings are both shown on a /10 scale. Genze is derived from internal model scores and price rules; community averages come from approved reviews (1–10 per category).
| Category | Genze /10 | Users /10 |
|---|---|---|
| Battery | 6.3 | — |
| Display | 6.9 | — |
| Performance | 5.4 | — |
| Camera | 4.2 | — |
| Body | 5.6 | — |
| Gaming | 6.1 | — |
| Software | 4.4 | — |
| Connectivity | 2.5 | — |
| Sensors | 7.2 | — |
| Software updates | — | — |
| Clean software | — | — |
| Heating | — | — |
| Media | — | — |
Community columns fill in when reviews are approved.
Quick specifications
6.28"
1080x2280 pixels
12MP
1080p
6GB RAM
Snapdragon 660
3200mAh
18W
Score breakdown
From specs, price tier & release year
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Full specifications
|
Network
|
Technology | GSM / CDMA / HSPA / LTE |
|---|---|---|
| 2G bands | GSM 850 / 900 / 1800 / 1900 | |
| ??? | CDMA 800 & TD-SCDMA | |
| 3G bands | HSDPA 850 / 900 / 1900 / 2100 | |
| 4G bands | 1, 2, 3, 5, 8, 34, 38, 39, 40, 41 | |
| Speed | HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps |
|
Launch
|
Announced | 2018, March. Released 2018, March |
|---|---|---|
| Status | Discontinued |
|
Body
|
Dimensions | 154.5 x 74.8 x 7.4 mm (6.08 x 2.94 x 0.29 in) |
|---|---|---|
| Weight | 156.2 g (5.50 oz) | |
| Build | Glass front (Gorilla Glass 3), aluminum back, aluminum frame | |
| SIM | Nano-SIM + Nano-SIM |
|
Display
|
Type | Super AMOLED |
|---|---|---|
| Size | 6.28 inches, 98.4 cm2 (~85.2% screen-to-body ratio) | |
| Resolution | 1080 x 2280 pixels, 19:9 ratio (~402 ppi density) | |
| Protection | Corning Gorilla Glass 3 |
|
Platform
|
OS | Android 8.1 (Oreo), Funtouch 4 |
|---|---|---|
| Chipset | Qualcomm SDM660 Snapdragon 660 (14 nm) | |
| CPU | Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) | |
| GPU | Adreno 512 |
|
Memory
|
Card slot | microSDXC (uses shared SIM slot) |
|---|---|---|
| Internal | 128GB 6GB RAM | |
| ??? | eMMC 5.1 |
|
Main Camera
|
Dual | 12 MP, f/1.8, 1/2.55", 1.4??m, dual pixel PDAF Auxiliary lens |
|---|---|---|
| Features | LED flash, HDR, panorama | |
| Video | 1080p@30fps |
|
Selfie camera
|
Single | 12 MP, f/2.0, (wide), 1/2.8", 1.28??m |
|---|---|---|
| Video | 1080p@30fps |
|
Sound
|
Loudspeaker | Yes |
|---|---|---|
| 3.5mm jack | Yes | |
| ??? | 32-bit/192kHz Hi-Res audio |
|
Comms
|
WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct |
|---|---|---|
| Bluetooth | 5.0, A2DP, LE | |
| Positioning | GPS, GLONASS | |
| NFC | No | |
| Radio | FM radio | |
| USB | microUSB 2.0, OTG |
|
Features
|
Sensors | Fingerprint (under display, optical), accelerometer, proximity, compass |
|---|
|
Battery
|
Type | Li-Ion 3200 mAh, non-removable |
|---|---|---|
| Charging | 18W wired |
|
Misc
|
Colors | Black, Ruby Red |
|---|---|---|
| Models | X21UD A | |
| Price | About 550 EUR |
vivo X21 UD official images
Frequently asked questions
Is vivo X21 UD worth buying in 2026?
vivo X21 UD is worth considering if its strengths match your priorities. Genze scores it 5.5/10 for its class. Read owner reviews and compare alternatives before you buy.
Is vivo X21 UD good for gaming?
vivo X21 UD scores 61/100 on our gaming index (chipset, display smoothness, and thermals). Casual and mid-tier titles usually run well; for competitive esports, compare frame stability and heating against phones in the same price band.
What is the battery capacity of vivo X21 UD?
vivo X21 UD has a 3,200 mAh battery. Real-world endurance depends on chipset efficiency, display, and usage.
What display size does vivo X21 UD have?
vivo X21 UD features a 6.28-inch display. See the Display section for resolution, refresh rate, and panel details.
How much RAM does vivo X21 UD have?
vivo X21 UD is available with 6 GB RAM variants. Storage options are listed in the Memory section.
What is the Genze score for vivo X21 UD?
Genze rates vivo X21 UD 5.5/10 based on performance, display, camera, battery, body build, and value versus phones in the same price tier.
Where do these specifications come from?
Specifications are compiled from official manufacturer and carrier sources, reviewed by our editors where possible, and enriched with Genze scores and community feedback. GenZe Rank is not responsible for errors or omissions. Regional variants, firmware updates, and retailer listings may differ from what is shown here—always confirm critical details on the official product page before you buy.
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