Product
Realme XT
Realme XT
Vivo Y51 (2015)
Vivo Y51 (2015)
Battery
Charging 20W wired -
Type 4000 mAh, non-removable Li-Ion 2350 mAh, non-removable
Body
Build Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), plastic frame -
Dimensions 158.7 x 75.2 x 8.6 mm (6.25 x 2.96 x 0.34 in) 143.8 x 71.7 x 7.5 mm (5.66 x 2.82 x 0.30 in)
SIM Nano-SIM + Nano-SIM Dual SIM
Weight 183 g (6.46 oz) 157 g (5.54 oz)
Comms
Bluetooth 5.0, A2DP, LE 4.0, A2DP
NFC No No
Positioning GPS, GLONASS, GALILEO, BDS GPS, GLONASS, BDS
Radio FM radio FM radio
USB USB Type-C 2.0 microUSB 2.0
WLAN Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct Wi-Fi 802.11 b/g/n, hotspot
Display
Protection Corning Gorilla Glass 5 -
Resolution 1080 x 2340 pixels, 19.5:9 ratio (~403 ppi density) 540 x 960 pixels, 16:9 ratio (~220 ppi density)
Size 6.4 inches, 100.5 cm2 (~84.3% screen-to-body ratio) 5.0 inches, 68.9 cm2 (~66.8% screen-to-body ratio)
Type Super AMOLED IPS LCD
Features
Sensors Fingerprint (under display, optical), accelerometer, gyro, proximity, compass Accelerometer, proximity, compass
Launch
Announced 2019, September 13. Released 2019, September 2015, December. Released 2015, December
Status Discontinued Discontinued
Main Camera
Features LED flash, HDR, panorama LED flash, HDR, panorama
Quad 64 MP, f/1.8, (wide), 1/1.72", 0.8µm, PDAF 8 MP, f/2.3, 13mm (ultrawide) 2 MP, f/2.4, (macro) 2 MP, f/2.4, (depth) -
Single - 8 MP, AF
Video 4K@30fps, 1080p@30/60/120fps, 720p@960fps, gyro-EIS 1080p@30fps
Memory
Card slot microSDXC (dedicated slot) microSDXC (dedicated slot)
Internal 64GB 4GB RAM, 64GB 6GB RAM, 128GB 8GB RAM 16GB 2GB RAM
  UFS 2.1 eMMC 4.5
Misc
Colors Pearl White, Pearl Blue White
Models RMX1921 Y51L, Y51, 1707, Y51A
Network
2G bands GSM 850 / 900 / 1800 / 1900 GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2
3G bands HSDPA 850 / 900 / 2100 HSDPA 850 / 900 / 2100
4G bands 1, 3, 5, 8, 38, 40, 41 LTE 850 / 900 / 1800 / 2100 / 2600 - Malaysia
Speed HSPA, LTE HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps
Technology GSM / HSPA / LTE GSM / HSPA / LTE
  - LTE 900 / 1800 / 2100 - Thailand, Indonesia
Our Tests
Audio quality Noise -92.2dB / Crosstalk -91.4dB -
Battery (old) Endurance rating 100h -
Camera Photo / Video -
Display 447 nits max brightness (measured) -
Loudspeaker Voice 68dB / Noise 74dB / Ring 89dB -
Performance AnTuTu: 185193 (v7) GeekBench: 6102 (v4.4) GFXBench: 13fps (ES 3.1 onscreen) -
Platform
Chipset Qualcomm SDM712 Snapdragon 712 (10 nm) Qualcomm MSM8916 Snapdragon 410 (28 nm)
CPU Octa-core (2x2.3 GHz Kryo 360 Gold & 6x1.7 GHz Kryo 360 Silver) Quad-core 1.2 GHz Cortex-A53
GPU Adreno 616 Adreno 306
OS Android 9.0 (Pie), upgradable to Android 10, Realme UI Android 5.0.2 (Lollipop), Funtouch 2.5
Selfie camera
Features HDR, panorama -
Single 16 MP, f/2.0, 25mm (wide), 1/3.06", 1.0µm 5 MP
Video 1080p@30fps 720p@30fps
Sound
3.5mm jack Yes Yes
Loudspeaker Yes Yes