Product
Vivo Y81i
Vivo Y81i
Xiaomi Redmi Y3
Xiaomi Redmi Y3
Battery
Charging - 10W wired
Type 3260 mAh, non-removable Li-Po 4000 mAh, non-removable
Body
Build Glass front (Gorilla Glass), plastic back, plastic frame Glass front (Gorilla Glass 5), plastic back, plastic frame
Dimensions 155.1 x 75 x 7.8 mm (6.11 x 2.95 x 0.31 in) 158.7 x 75.6 x 8.5 mm (6.25 x 2.98 x 0.33 in)
SIM Nano-SIM + Nano-SIM Nano-SIM + Nano-SIM
Weight 143 g (5.04 oz) 180 g (6.35 oz)
  - Splash resistant
Comms
Bluetooth 5.0, A2DP, LE 4.2, A2DP, LE
Infrared port - Yes
NFC No No
Positioning GPS, GLONASS, BDS GPS, GLONASS, GALILEO
Radio FM radio FM radio
USB microUSB 2.0, OTG microUSB 2.0, OTG
WLAN Wi-Fi 802.11 b/g/n, Wi-Fi Direct Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Display
Protection Corning Gorilla Glass Corning Gorilla Glass 5
Resolution 720 x 1520 pixels, 19:9 ratio (~270 ppi density) 720 x 1520 pixels, 19:9 ratio (~269 ppi density)
Size 6.22 inches, 96.6 cm2 (~83.0% screen-to-body ratio) 6.26 inches, 97.8 cm2 (~81.5% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Accelerometer, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Launch
Announced 2018, October. Released 2018, November 2019, April. Released 2019, April
Status Discontinued Discontinued
Main Camera
Dual - 12 MP, f/2.2, 1/2.9", 1.25µm, PDAF 2 MP, (depth)
Features LED flash, HDR, panorama LED flash, panorama, HDR
Single 13 MP, f/2.2, PDAF -
Video 1080p@30fps 1080p@30/60fps, gyro-EIS
Memory
Card slot microSDXC (dedicated slot) microSDXC (dedicated slot)
Internal 16GB 2GB RAM 32GB 3GB RAM, 64GB 4GB RAM
  eMMC 5.1 eMMC 5.1
Misc
Colors Black, Red Elegant Blue, Bold Red, Prime Black
Models 1812, 1812_19 M1810F6G, M1810F6I
SAR - 0.58 W/kg (head)     1.25 W/kg (body)    
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, 5, 7, 8, 38, 40, 41 1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40
Speed HSPA 21.1/5.76 Mbps, LTE (2CA) Cat7 300/150 Mbps HSPA, LTE
Technology GSM / HSPA / LTE GSM / HSPA / LTE
  - 1, 3, 5, 8, 40, 41 - India
Our Tests
Performance - AnTuTu: 103259 (v7) GeekBench: 4292 (v4.4) GFXBench: 7.7fps (ES 3.1 onscreen)
Platform
Chipset Mediatek MT6761 Helio A22 (12 nm) Qualcomm SDM632 Snapdragon 632 (14 nm)
CPU Quad-core 2.0 GHz Cortex-A53 Octa-core (4x1.8 GHz Kryo 250 Gold & 4x1.8 GHz Kryo 250 Silver)
GPU PowerVR GE8320 Adreno 506
OS Android 8.1 (Oreo), Funtouch 4 Android 9.0 (Pie), planned upgrade to Android 10, MIUI 12
Selfie camera
Features - HDR
Single 5 MP, f/2.2 32 MP, f/2.2, 26mm (wide), 1/2.8", 0.8µm
Video 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes