| vivo X21 UD |
Xiaomi Redmi Note 9 Pro |
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| Hardware and OS | vivo X21 UD | Xiaomi Redmi Note 9 Pro |
| Operating system | Android 8.1 (Oreo); Funtouch 4 | Android 10.0; MIUI 11 |
| Processor | Octa-core (4x2.2 GHz Kryo 260 & 4x1.8 GHz Kryo 260) | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| Chipset | Qualcomm SDM660 Snapdragon 660 (14 nm) | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| GPU | Adreno 512 | Adreno 618 |
| Internal memory | 128 GB, 6 GB RAM | 64GB 4GB RAM, 128GB 6GB RAM |
| External memory | microSD, up to 256 GB (uses SIM 2 slot) | microSDXC (dedicated slot) |
| Display | vivo X21 UD | Xiaomi Redmi Note 9 Pro |
| Type | Super AMOLED | IPS LCD |
| Size | 6.28" inc | 6.67" inc |
| Resolution | 1080 x 2280 px | 1080 x 2400 px |
| Touchscreen | capacitive touchscreen | capacitive touchscreen |
| Protection | Corning Gorilla Glass 5 | |
| Screen-to-Body Ratio | 85.2% | 84.5% |
| Display area | 98.4 cm2 | 107.4 cm2 |
| Display aspect ratio | 19:9 (height:width) | 20:9 (height:width) |
| Pixel Density | 402 PPI | 395 PPI |
| Colors | 16M | 16M |
| Other | 450 nits typ. brightness (advertised) | |
| Connectivity | vivo X21 UD | Xiaomi Redmi Note 9 Pro |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 |
| 4G Network | LTE band 1(2100), 2(1900), 3(1800), 5(850), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500) | LTE band 1(2100), 3(1800), 5(850), 8(900), 40(2300), 41(2500) |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| Network | GSM / CDMA / HSPA / LTE | GSM / HSPA / LTE |
| SIM card | Hybrid Dual SIM (Nano-SIM, dual stand-by) | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | 5.0, A2DP, LE | 5.0, A2DP, LE |
| Edge | Yes | Yes |
| GPRS | Yes | Yes |
| GPS | Yes, with A-GPS, GLONASS | Yes, with A-GPS, GLONASS, GALILEO, BDS, NavIC |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps | HSPA 42.2/5.76 Mbps, LTE-A |
| USB | microUSB 2.0, USB On-The-Go | 2.0, Type-C 1.0 reversible connector |
| Camera | vivo X21 UD | Xiaomi Redmi Note 9 Pro |
| Main camera | 12 MP, Dual | 48 MP, Quad |
| Specs | 12 MP, f/1.8, 1/2.55', 1.4µm, dual pixel PDAF -5 MP, f/2.4, depth sensor | 48 MP, f/1.8, (wide), 1/2.25", 0.8µm, PDAF -8 MP, f/2.2, 13mm (ultrawide), 1/4.0", 1.12µm -5 MP, f/2.4, (macro), 1.12µm -2 MP, f/2.4, (depth) |
| Features | LED flash, HDR, panorama | LED flash, HDR, panorama |
| Video | 1080p@30fps | 2160p@30fps, 1080p@30/60/120fps, 720p@960fps, gyro-EIS |
| Selfie camera | 12 MP, Single | 16 MP, Single |
| Multimedia | vivo X21 UD | Xiaomi Redmi Note 9 Pro |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio, recording |
| Design | vivo X21 UD | Xiaomi Redmi Note 9 Pro |
| Colors | Black, Ruby Red | Aurora Blue, Glacier White, Interstellar Black |
| Body build | Front glass, aluminum body | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame |
| Dimensions | 154.5 x 74.8 x 7.4 mm | 165.8 x 76.7 x 8.8 mm |
| Weight | 156.2 g | 209 g |
| Battery | vivo X21 UD | Xiaomi Redmi Note 9 Pro |
| Battery capacity | 3200 mAh, Non-removable Li-Ion | 5020 mAh, Non-removable Li-Po |
| Other | vivo X21 UD | Xiaomi Redmi Note 9 Pro |
| Release date | 2018, March | 2020, March 12 |
| Sensors | Fingerprint (under display), accelerometer, proximity, compass | Fingerprint (side-mounted), accelerometer, gyro, proximity, compass , Infrared port |
