Product
Vivo Z1
Vivo Z1
Xiaomi Redmi Y3
Xiaomi Redmi Y3
Battery
Charging - 10W wired
Type Li-Ion 3260 mAh, non-removable Li-Po 4000 mAh, non-removable
Body
Build Glass front, plastic back, plastic frame Glass front (Gorilla Glass 5), plastic back, plastic frame
Dimensions 154.8 x 75 x 7.9 mm (6.09 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 149.3 g (5.26 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, BDS GPS, GLONASS, GALILEO
Radio FM radio FM radio
USB microUSB 2.0, OTG microUSB 2.0, OTG
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct Wi-Fi 802.11 b/g/n, Wi-Fi Direct
Display
Protection - Corning Gorilla Glass 5
Resolution 1080 x 2280 pixels, 19:9 ratio (~403 ppi density) 720 x 1520 pixels, 19:9 ratio (~269 ppi density)
Size 6.26 inches, 97.8 cm2 (~84.2% screen-to-body ratio) 6.26 inches, 97.8 cm2 (~81.5% screen-to-body ratio)
Type IPS LCD IPS LCD
Features
Sensors Fingerprint (rear-mounted), accelerometer, proximity, compass Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass
Launch
Announced 2018, May. Released 2018, June 2019, April. Released 2019, April
Status Discontinued Discontinued
Main Camera
Dual 13 MP, PDAF 2 MP, (depth) 12 MP, f/2.2, 1/2.9", 1.25µm, PDAF 2 MP, (depth)
Features LED flash, HDR, panorama LED flash, panorama, HDR
Video 4K@30fps, 1080p@30fps 1080p@30/60fps, gyro-EIS
Memory
Card slot microSDXC (uses shared SIM slot) microSDXC (dedicated slot)
Internal 64GB 4GB RAM, 64GB 6GB RAM, 128GB 6GB RAM 32GB 3GB RAM, 64GB 4GB RAM
  eMMC 5.1 eMMC 5.1
Misc
Colors Sapphire blue, Enamel blue, Hyun red, Enamel black, Black gold limited edition, Aurora Special Edition Elegant Blue, Bold Red, Prime Black
Models V1801A0 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, 8, 34, 38, 39, 40, 41 1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40
Speed HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps HSPA, LTE
Technology GSM / CDMA / HSPA / LTE GSM / HSPA / LTE
  CDMA 800 & TD-SCDMA 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 Qualcomm SDM660 Snapdragon 660 (14 nm) Qualcomm SDM632 Snapdragon 632 (14 nm)
CPU Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver) Octa-core (4x1.8 GHz Kryo 250 Gold & 4x1.8 GHz Kryo 250 Silver)
GPU Adreno 512 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 12 MP, f/2.0, (wide), 1/2.8", 1.28µm 32 MP, f/2.2, 26mm (wide), 1/2.8", 0.8µm
Video 1080p@30fps 1080p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes