Samsung Galaxy A31 vs Samsung Galaxy A51
A spec-by-spec comparison of the Samsung Galaxy A31 and the Samsung Galaxy A51, taken from their full specification sheets. Green marks the better value in each measured row.
VS
Head to head
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| Price | $780 | $79 |
| Our rating | 7/10 | 7/10 |
| Battery | 5,000 mAh | 4,000 mAh |
| Wired charging | 15W | 15W |
| RAM (max) | 6 GB | 8 GB |
| Storage (max) | 128 GB | 256 GB |
| Screen size | 6.4 in | 6.5 in |
| Main camera | 48 MP | 48 MP |
| Weight (lower is lighter) | 185 g | 172 g |
| Released | Apr 2020 | Dec 2019 |
Summary: Samsung Galaxy A31 is ahead on battery. Samsung Galaxy A51 is ahead on ram (max), storage (max), screen size, weight (lower is lighter).
★ Which should you buy? Samsung Galaxy A51 is the stronger overall pick on the measured specs.
Display
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| Type | Super AMOLED | Super AMOLED, 16M colors |
| Size | 6.4 inches, 98.9 cm2 (~84.9% screen-to-body ratio) | 6.5 inches, 102.0 cm² (~87.4% screen-to-body ratio) |
| Resolution | 1080 x 2400 pixels, 20:9 ratio (~411 ppi density) | 1080 x 2400 pixels, 20:9 ratio (~405 ppi density) |
| Protection | Corning Gorilla Glass (unspecified version) | Corning Gorilla Glass 3 |
| Features | — | Infinity-O Display |
Platform
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| OS | Android 10, upgradable to Android 12, One UI 4.1 | Android 10, upgradable to Android 13, One UI 5.1 |
| Chipset | Mediatek Helio P65 (12nm) | Exynos 9611 (10 nm) |
| CPU | Octa-core (2x2.0 GHz Cortex-A75 & 6x1.7 GHz Cortex-A55) | Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53) |
| GPU | Mali-G52 MC2 | Mali-G72 MP3 |
Memory
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| Card slot | microSDXC (dedicated slot) | microSDXC (dedicated slot) |
| Internal | 64GB 4GB RAM, 128GB 4GB RAM, 128GB 6GB RAM | 64GB 4GB RAM, 128GB 4GB RAM, 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM |
Main Camera
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| Quad | 48 MP, f/2.0, 26mm (wide), 1/2.0", 0.8µm, PDAF; 8 MP, f/2.2, 123˚ (ultrawide), 1/4.0", 1.12µm; 5 MP, f/2.4, (macro); 5 MP, f/2.4, (depth) | 48 MP, f/2.0, 26mm (wide), 1/2.0", 0.8µm, PDAF; 12 MP, f/2.2, 123˚ (ultrawide); 5 MP, f/2.4, (macro); 5 MP, f/2.4, (depth) |
| Features | LED flash, panorama, HDR | LED flash, panorama, HDR |
| Video | 1080p@30fps | 4K@30fps, 1080p@30/120fps; gyro-EIS |
Selfie Camera
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| Single | 20 MP, f/2.2, (wide) | 32 MP, f/2.2, 26mm (wide), 1/2.8", 0.8µm |
| Features | HDR | HDR |
| Video | 1080p@30fps | 4K@30fps, 1080p@30fps |
Battery
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| Type | Li-Po 5000 mAh, non-removable | Li-Po 4000 mAh, non-removable |
| Charging | 15W wired | 15W wired |
Body
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| Dimensions | 159.3 x 73.1 x 8.6 mm (6.27 x 2.88 x 0.34 in) | 158.5 x 73.6 x 7.9 mm (6.24 x 2.90 x 0.31 in) |
| Weight | 185 g (6.53 oz) | 172 g (6.07 oz) |
| Build | Glass front, plastic back, plastic frame | Glass front (Gorilla Glass 3), plastic back, plastic frame |
| SIM | Single SIM (Nano-SIM) or Dual SIM (Nano-SIM, dual stand-by) | Single SIM (Nano-SIM) or Dual SIM (Nano-SIM, dual stand-by) |
Comms
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct |
| Bluetooth | 5.0, A2DP, LE | 5.0, A2DP, LE |
| Positioning | GPS, GLONASS, GALILEO, BDS | GPS, GLONASS, GALILEO, BDS |
| NFC | Yes (market/region dependent) | Yes (market/region dependent) |
| Radio | FM radio | — |
| USB | USB Type-C 2.0, OTG | USB Type-C 2.0 |
Launch
| Samsung Galaxy A31 | Samsung Galaxy A51 | |
|---|---|---|
| Announced | 2020, March 24 | December 12, 2019 |
| Status | Available. Released 2020, April 27 | — |
| Released | — | December 16, 2019 |
Frequently asked questions
Which has the better battery, Samsung Galaxy A31 or Samsung Galaxy A51?
Samsung Galaxy A31 — 5,000 mAh for the Samsung Galaxy A31 versus 4,000 mAh for the Samsung Galaxy A51.
Which has more RAM, Samsung Galaxy A31 or Samsung Galaxy A51?
Samsung Galaxy A51 — 6 GB for the Samsung Galaxy A31 versus 8 GB for the Samsung Galaxy A51.
Which is lighter, Samsung Galaxy A31 or Samsung Galaxy A51?
Samsung Galaxy A51 — 185 g for the Samsung Galaxy A31 versus 172 g for the Samsung Galaxy A51.
Which is newer, Samsung Galaxy A31 or Samsung Galaxy A51?
Samsung Galaxy A31 — Apr 2020 for the Samsung Galaxy A31 versus Dec 2019 for the Samsung Galaxy A51.
Is the Samsung Galaxy A31 or the Samsung Galaxy A51 rated higher?
We rate the Samsung Galaxy A31 7/10 and the Samsung Galaxy A51 7/10.