Phone Comparison - Xiaomi Redmi K20 vs Realme X2 vs Samsung Galaxy A51
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| Manufacturer | Xiaomi | Realme | Samsung |
| Announced | May 2019 | Released 2019, September | December 2019 |
| Status | Coming soon. Exp. release 2019, July 17 | Coming Soon - December 17, 2019 | Coming Soon - December 12, 2019 |
| Price | Rs. 21,999 ($0.00) [Similarly Priced] | Rs. 16,999 ($0.00) [Similarly Priced] | Rs. 23,999 ($0.00) [Similarly Priced] |
| Colors | Carbon black, Flame red, Glacier blue | Pearl White, Pearl Blue | Prism Crush White, Black, Pink, Blue |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
156.7 x 74.3 x 8.8 mm (6.17 x 2.93 x 0.35 in) |
158.7 × 75.2 × 8.6 mm (6.25 × 2.96 × 0.34 in) |
158.4 x 73.7 x 7.9 mm (6.24 x 2.9 x 0.31 in) |
| Weight | 191 g (6.74 oz) | 182 g (6.42 oz) | 172 g (6.07 oz) |
| SIM Type | Dual SIM (Nano-SIM, dual stand-by) | Dual SIM (Nano-SIM, dual stand-by) | Single SIM (Nano-SIM), Dual SIM (Nano-SIM, dual stand-by) |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 | HSDPA 850 / 900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 |
| 4G Network | LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500) | LTE band 1(2100), 3(1800), 5(850), 8(900), 38(2600), 40(2300), 41(2500) | LTE (unspecified) |
| Messaging | |||
| Build Features | - Fingerprint Sensor(In-display) |
- Fingerprint Sensor(In-display) |
- Fingerprint Sensor(In-display) |
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| OS | Android 9.0 (Pie) | Android 9.0 (Pie), planned upgrade to Android 10.0 | Android 9.0 (Pie) |
| User Interface | MIUI 10 | ColorOS 6 | One UI |
| Processor | Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver), Qualcomm SDM730 Snapdragon 730 (8 nm) | Octa-core (2x2.2 GHz Kryo 470 Gold & 6x1.8 GHz Kryo 470 Silver), Qualcomm SDM730 Snapdragon 730G (8 nm) | Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53), Exynos 9611 (10nm) |
| GPU | Adreno 618 | Adreno 618 | Mali-G72 MP3 |
| RAM | 8 GB | 8GB | 8 GB |
| Internal Memory | 256 GB | 128GB | 128 GB |
| External Memory | No | microSD, up to 256 GB (dedicated slot) | microSD, up to 512 GB (dedicated slot) |
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| Type | AMOLED Capacitive Touchscreen, Corning Gorilla Glass 5 | Full HD+ Super AMOLED Capacitive Touchscreen, Corning Gorilla Glass 5 | Full HD+ Infinity-O Super AMOLED Capacitive Touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 6.39 inches | 6.4 inches | 6.5 inches |
| Resolution | 1080 x 2340 pixels (403 ppi) | 1080 x 2340 pixels (403 ppi) | 1080 x 2340 pixels (396 ppi) |
| Screen-to-Body Ratio | 86.23% | - | 89.06% |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | Yes | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 48 MP + 8 MP + 13 MP | 64 MP + 8 MP + 2 MP + 2 MP | 48 MP + 12 MP + 5 MP + 5 MP |
| Flash | Dual-LED Flash | LED Flash | LED Flash |
| Features | 48 MP, f/1.8, 26mm (wide), 1/2", 0.8µm, PDAF 8 MP, f/2.4, 53mm (telephoto), 1/4", 1.12µm, PDAF, 2x optical zoom 13 MP, f/2.4, 12mm (ultrawide), 1/3", 1.12µm HDR, Panorama |
64 MP, f/1.8, (wide), 1/1.7", 0.8µm, PDAF 8 MP, f/2.3, 13mm (ultrawide), 1/4", 1.12µm 2 MP, f/2.4, 1/5", 1.75µm (dedicated macro camera) 2 MP, f/2.4, 1/5", 1.75µm, depth sensor HDR, panorama |
48 MP, f/1.8, (wide), 1/2", 0.8µm, PDAF 12 MP, f/2.2, 13mm (ultrawide) 5 MP, f/2.2, depth sensor 5 MP, f/2.4, macro camera Panorama, HDR |
| Video | 2160p@30fps, 1080p@30/120/240fps, 1080p@960fps | 2160p@30fps, 1080p@30/60/120fps, 720p@960fps, gyro-EIS | 2160p@30fps, 1080p@30fps |
| Front Camera | Motorized pop-up 20 MP, f/2.2, 0.8µm, HDR, 1080p@30fps [Similar] |
32 MP, f/2.0, 0.8µm HDR, 1080p@30fps [Similar] |
32 MP, f/2.0, 25mm (wide) HDR 1080p@30fps [Similar] |
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| GPRS | Yes | Yes | Yes |
| Edge | Yes | Yes | Yes |
| 3G | HSPA 42.2/5.76 Mbps, LTE-A | HSPA 42.2/11.5 Mbps, LTE-A | HSPA, LTE-A |
| Bluetooth | 5.0, A2DP, LE, aptX HD | 5.0, A2DP, LE | 5.0, A2DP, LE |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot |
| USB | 2.0, Type-C 1.0 reversible connector, USB On-The-Go | 2.0, Type-C 1.0 reversible connector | 2.0, Type-C 1.0 reversible connector, USB On-The-Go |
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS | Yes, with A-GPS, GLONASS, GALILEO, BDS | Yes, with A-GPS, GLONASS, GALILEO, BDS |
| Browser | Yes | Yes | |
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| Internal | 256 GB, 8 GB RAM or 64/128 GB, 6 GB RAM | 128GB, 8GB RAM or 128GB, 6GB RAM or 64GB, 4GB RAM (UFS2.1) | 128 GB, 8 GB RAM or 128 GB, 6 GB RAM or 64 GB, 4 GB RAM |
| Expandable Storage | No | microSD, up to 256 GB (dedicated slot) | microSD, up to 512 GB (dedicated slot) |
| USB OTG | Supported | Not Supported | Supported |
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| Fingerprint | |
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| Proximity Sensor | |
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| Accelerometer Sensor | |
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| Magnetic-Field Sensor (Compass) | |
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| Gyroscope Sensor | |
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| NFC | |
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| Type | Non-removable Li-Po Battery Fast battery charging 18W |
Non-removable Li-Po Battery Fast battery charging 30W: 67% in 30 min (VOOC Flash Charge 3.0) |
Non-removable Li-Po Battery Fast battery charging 15W |
| Capacity | 4000 mAh | 4000 mAh | 4000 mAh |
| Stand by | - | - | - |
| Talk Time | - | - | - |
Rs. 19,999 
Rs. 25,250 
