Product
Vivo X21i
Vivo X21i
Xiaomi Mi CC9 Pro
Xiaomi Mi CC9 Pro
Battery
Charging 18W wired 30W wired, PD, 58% in 30 min, 100% in 65 min
Type Li-Ion 3425 mAh, non-removable Li-Po 5260 mAh, non-removable
Body
Build - Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), aluminum frame
Dimensions 154.4 x 75 x 7 mm (6.08 x 2.95 x 0.28 in) 157.8 x 74.2 x 9.7 mm (6.21 x 2.92 x 0.38 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 159 g (5.61 oz) 208 g (7.34 oz)
Comms
Bluetooth 5.0, A2DP, LE 5.0, A2DP, LE, aptX HD
Infrared port - Yes
NFC No Yes
Positioning GPS, GLONASS GPS, GLONASS, GALILEO, BDS
Radio FM radio FM radio
USB microUSB 2.0, OTG USB Type-C 2.0
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Display
Protection - Corning Gorilla Glass 5
Resolution 1080 x 2280 pixels, 19:9 ratio (~402 ppi density) 1080 x 2340 pixels, 19.5:9 ratio (~398 ppi density)
Size 6.28 inches, 98.4 cm2 (~85.0% screen-to-body ratio) 6.47 inches, 102.8 cm2 (~87.8% screen-to-body ratio)
Type Super AMOLED AMOLED, HDR10, 600 nits (typ)
Features
Sensors Fingerprint (rear-mounted), accelerometer, proximity, compass Fingerprint (under display, optical), accelerometer, gyro, compass
  - Virtual proximity sensing
Launch
Announced 2018, May. Released 2018, May 2019, November. Released 2019, November
Status Discontinued Discontinued
Main Camera
Dual 12 MP, f/1.8, 1/2.55", 1.4µm, dual pixel PDAF 5 MP, f/2.4, (depth) -
Features LED flash, HDR, panorama Laser AF, Quad-LED dual-tone flash, HDR
Five - 108 MP (8P lens - 256GB GB model), f/1.7, 25mm (wide), 1/1.33", 0.8µm, PDAF, OIS 12 MP, f/2.0, 50mm (telephoto), 1/2.55", 1.4µm, dual pixel PDAF, 2x optical zoom 5 MP (upscaled to 8MP), f/2.0, (telephoto), 1.0µm, PDAF, OIS, 5x optical zoom 20 MP, f/2.2, 13mm (ultrawide), 1/2.8", 1.0µm 2 MP, f/2.4, (macro)
Video 1080p@30fps 4K@30fps, 1080p@30/60/120/240fps, 720p@960fps
Memory
Card slot microSDXC (uses shared SIM slot) No
Internal 64GB 6GB RAM, 128GB 4GB RAM 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM
  eMMC 5.1 UFS 2.1
Misc
Colors Black, Aurora White, Ruby Red, Night Purple Aurora Green, Glacier White, Midnight Black
Models X21i A M1910F4E
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 2100 HSDPA 850 / 900 / 1900 / 2100
4G bands 1, 3, 4, 5, 8, 38, 39, 40, 41 1, 3, 5, 7, 8, 34, 38, 39, 40, 41 - China
Speed HSPA, LTE HSPA 42.2/5.76 Mbps, LTE (3CA) Cat15 800/150 Mbps
Technology GSM / CDMA / HSPA / LTE GSM / CDMA / HSPA / LTE
  CDMA 800 & TD-SCDMA CDMA 800 & TD-SCDMA
Our Tests
Performance - AnTuTu: 236051 (v8)
Platform
Chipset Mediatek MT6771 Helio P60 (12 nm) Qualcomm SDM730 Snapdragon 730G (8 nm)
CPU Octa-core (4x2.0 GHz Cortex-A73 & 4x2.0 GHz Cortex-A53) Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver)
GPU Mali-G72 MP3 Adreno 618
OS Android 8.1 (Oreo), Funtouch 4 Android 9.0 (Pie), upgradable to Android 11, MIUI 12
Selfie camera
Features - HDR
Single 24 MP, f/2.0, 26mm (wide), 1/2.8", 0.9µm 32 MP, f/2.0, 26mm (wide), 1/2.8", 0.8µm
Video 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes
  32-bit/192kHz Hi-Res audio 24-bit/192kHz Hi-Res audio