Product
Xiaomi Redmi 3
Xiaomi Redmi 3
Vivo Z1x
Vivo Z1x
Battery
Charging 10W wired 22.5W wired 5W reverse wired
Type Li-Ion 4100 mAh, non-removable 4500 mAh, non-removable
Body
Build Glass front, aluminum back, aluminum frame Glass front, plastic back, plastic frame
Dimensions 139.3 x 69.6 x 8.5 mm (5.48 x 2.74 x 0.33 in) 159.5 x 75.2 x 8.1 mm (6.28 x 2.96 x 0.32 in)
SIM Nano-SIM + Micro-SIM Nano-SIM + Nano-SIM
Weight 144 g (5.08 oz) 189.6 g (6.70 oz)
Comms
Bluetooth 4.1, A2DP 5.0, A2DP, LE, aptX
Infrared port Yes -
NFC No No
Positioning GPS, GLONASS, BDS GPS, GLONASS
Radio FM radio FM radio
USB microUSB 2.0 USB Type-C 2.0, OTG
WLAN Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Display
Resolution 720 x 1280 pixels, 16:9 ratio (~294 ppi density) 1080 x 2340 pixels, 19.5:9 ratio (~404 ppi density)
Size 5.0 inches, 68.9 cm2 (~71.1% screen-to-body ratio) 6.38 inches, 99.9 cm2 (~83.3% screen-to-body ratio)
Type IPS LCD Super AMOLED
Features
Sensors Accelerometer, gyro, proximity, compass Fingerprint (under display, optical), accelerometer, proximity, compass
Launch
Announced 2016, January. Released 2016, January 2019, September. Released 2019, September
Status Discontinued Discontinued
Main Camera
Features LED flash, HDR, panorama LED flash, HDR, panorama
Single 13 MP, f/2.0, PDAF -
Triple - 48 MP, f/1.8, (wide), 1/2.0", 0.8µm, PDAF 8 MP, f/2.2, 13mm (ultrawide) 2 MP, f/2.4, (depth)
Video 1080p@30fps 4K@30fps, 1080p@30fps
Memory
Card slot microSDXC (uses shared SIM slot) No
Internal 16GB 2GB RAM, 32GB 3GB RAM 64GB 6GB RAM, 128GB 4GB RAM, 128GB 6GB RAM, 128GB 8GB RAM
  eMMC 4.5 UFS 2.1
Misc
Colors Gold, Dark Gray, Silver, Classic Gold Fusion Blue, Phantom Purple
Models 2015816 1917, PD1921F_EX
SAR 0.90 W/kg (head)     0.56 W/kg (body)     1.03 W/kg (head)     0.55 W/kg (body)    
SAR EU 1.33 W/kg (head)     -
Network
2G bands GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 GSM 850 / 900 / 1800 / 1900
3G bands HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 2100
4G bands 1, 3, 7, 38, 39, 40, 41 1, 3, 5, 8, 38, 40, 41
Speed HSPA, LTE, EV-DO Rev.A 3.1 Mbps HSPA, LTE
Technology GSM / CDMA / HSPA / EVDO / LTE GSM / HSPA / LTE
  CDMA2000 1xEV-DO -
Our Tests
Battery (old) Endurance rating 107h -
Camera Photo / Video -
Platform
Chipset Qualcomm MSM8939v2 Snapdragon 616 (28 nm) Qualcomm SDM712 Snapdragon 712 (10 nm)
CPU Octa-core (4x1.5 GHz Cortex-A53 & 4x1.2 GHz Cortex-A53) Octa-core (2x2.3 GHz Kryo 360 Gold & 6x1.7 GHz Kryo 360 Silver)
GPU Adreno 405 Adreno 616
OS Android 5.1 (Lollipop), MIUI 7 Android 9.0 (Pie), upgradable to Android 10, Funtouch 10
Selfie camera
Features - HDR
Single 5 MP, f/2.2 32 MP, f/2.0, 26mm (wide), 1/2.8", 0.8µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes