Phone Comparison - Samsung Galaxy A8 (2018) vs Samsung Galaxy A51 vs Samsung Galaxy A21
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| Price Comparison (India) | - | - | |
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| Manufacturer | Samsung | Samsung | Samsung |
| Announced | December 2017 | December 2019 | 2020, April 8 |
| Status | Coming Soon - January 2018 | Coming Soon - December 12, 2019 | Coming soon. Exp. release 2020, April |
| Price | Rs. 37,750 ($589.00) [Similarly Priced] | Rs. 23,999 ($0.00) [Similarly Priced] | - |
| Colors | Black, orchid grey, gold, blue | Prism Crush White, Black, Pink, Blue | Various |
| Form Factor | Candybar | Candybar | Candybar |
| Dimension |
149.2 x 70.6 x 8.4 mm (5.87 x 2.78 x 0.33 in) |
158.4 x 73.7 x 7.9 mm (6.24 x 2.9 x 0.31 in) |
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| Weight | 172 g (6.07 oz) | 172 g (6.07 oz) | - |
| SIM Type | Single SIM (Nano-SIM), Dual SIM (Nano-SIM, dual stand-by) | Single SIM (Nano-SIM), 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 (dual-SIM model only) | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM model only) | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM only) |
| 3G Network | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 | HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 |
HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 1700(AWS) / 1900 / 2100 |
| 4G Network | LTE | LTE (unspecified) | LTE |
| Messaging | SMS, MMS, EMail, IM | ||
| Build Features | - Fingerprint Sensor - Samsung Pay - IP68 certified - dust/water proof over 1.5 meter and 30 minutes |
- Fingerprint Sensor(In-display) |
- Fingerprint Sensor Glass front, plastic back, plastic frame |
| Notification LED | Yes | - | - |
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| OS | Android 7.1.1 (Nougat) | Android 9.0 (Pie) | Android 10.0 |
| User Interface | - | One UI | One UI 2.0 |
| Processor | Octa-core (2x2.2 GHz Cortex-A73 & 6x1.6 GHz Cortex-A53), Exynos 7885 Octa | Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53), Exynos 9611 (10nm) | Octa-core (4x2.35 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53), Mediatek MT6765 Helio P35 (12nm) |
| GPU | Mali-G71 | Mali-G72 MP3 | PowerVR GE8320 |
| RAM | 4 GB | 8 GB | 3 GB |
| Internal Memory | 32/64 GB | 128 GB | 64 GB |
| External Memory | microSD, up to 256 GB (dedicated slot) | microSD, up to 512 GB (dedicated slot) | microSDXC (dedicated slot) |
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| Type | Super AMOLED Capacitive Touchscreen, Corning Gorilla Glass (unspecified Version) | Full HD+ Infinity-O Super AMOLED Capacitive Touchscreen | HD+ Super AMOLED Capacitive Touchscreen |
| Colors | 16M colors | 16M colors | 16M colors |
| Size | 5.6 inches | 6.5 inches | 6.5 inches |
| Resolution | 1080 x 2220 (441 ppi) | 1080 x 2340 pixels (396 ppi) | 720 x 1600 pixels (270 ppi) |
| Screen-to-Body Ratio | 75.51% | 89.06% | - |
| Multi-Touch |  |
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| 3.5mm Jack | |
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| Radio | FM radio | FM radio | FM radio |
| Games | Yes + Downloadable | Yes + Downloadable | Yes + Downloadable |
| Loud Speaker | |
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| Rear Camera | 16 MP | 48 MP + 12 MP + 5 MP + 5 MP | 16 MP + 8 MP + 2 MP + 2 MP |
| Flash | LED Flash | LED Flash | No |
| Features | Phase Detection Autofocus, f/1.7, Geo-tagging, Touch Focus, Face Detection, Panorama, HDR | 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 |
16 MP, f/1.9, 28mm (wide), AF 8 MP, f/2.2, 12mm (ultrawide) 2 MP, (macro) 2 MP, (depth) panorama, HDR |
| Video | 1080p@30fps | 2160p@30fps, 1080p@30fps | 1080p@30fps |
| Front Camera | Dual 16 MP + 8 MP, f/1.9, 1080p [Similar] |
32 MP, f/2.0, 25mm (wide) HDR 1080p@30fps [Similar] |
13 MP 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 (3CA) Cat11 600/75 Mbps, VoLTE | HSPA, LTE-A | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps |
| Bluetooth | 5.0, A2DP, EDR, LE | 5.0, A2DP, LE | 5.0, A2DP, LE |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, WiFi Direct, hotspot | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | Wi-Fi 802.11 b/g/n, Wi-Fi Direct, hotspot |
| USB | 2.0, Type-C 1.0 reversible connector | 2.0, Type-C 1.0 reversible connector, USB On-The-Go | 2.0, Type-C 1.0 reversible connector, USB On-The-Go |
| GPS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS, GLONASS, GALILEO, BDS | Yes, with A-GPS, GLONASS, BDS |
| Browser | HTML5 | Yes | Yes |
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| Internal | 32/64 GB, 4 GB RAM | 128 GB, 8 GB RAM or 128 GB, 6 GB RAM or 64 GB, 4 GB RAM | 64 GB, 3 GB RAM eMMC 5.1 |
| Expandable Storage | microSD, up to 256 GB (dedicated slot) | microSD, up to 512 GB (dedicated slot) | microSDXC (dedicated slot) |
| USB OTG | Not Supported | 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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| Barometer Sensor | |
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| NFC | |
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| Type | Non-removable Li-Ion Battery | Non-removable Li-Po Battery Fast battery charging 15W |
Non-removable Li-Po Battery Fast battery charging 15W |
| Capacity | 3000 mAh | 4000 mAh | 4000 mAh |
| Stand by | - | - | - |
| Talk Time | - | - | - |
Rs. 25,250 
