Samsung Galaxy A51 vs Samsung Galaxy M31
A spec-by-spec comparison of the Samsung Galaxy A51 and the Samsung Galaxy M31, taken from their full specification sheets. Green marks the better value in each measured row.
Head to head
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| Price | $79 | $178 |
| Our rating | 7/10 | 7/10 |
| Battery | 4,000 mAh | 6,000 mAh |
| Wired charging | 15W | 15W |
| RAM (max) | 8 GB | 8 GB |
| Storage (max) | 256 GB | 128 GB |
| Screen size | 6.5 in | 6.4 in |
| Main camera | 48 MP | 64 MP |
| Weight (lower is lighter) | 172 g | 191 g |
| Released | Dec 2019 | Mar 2020 |
Summary: Samsung Galaxy A51 is ahead on storage (max), screen size, weight (lower is lighter). Samsung Galaxy M31 is ahead on battery, main camera.
★ Which should you buy? Samsung Galaxy A51 is the stronger overall pick on the measured specs.
Reviewed by the infozme.com Editorial Team — see how we research & rate phones.
Display
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| Type | Super AMOLED, 16M colors | Super AMOLED |
| Size | 6.5 inches, 102.0 cm² (~87.4% screen-to-body ratio) | 6.4 inches, 99.8 cm2 (~84.1% screen-to-body ratio) |
| Resolution | 1080 x 2400 pixels, 20:9 ratio (~405 ppi density) | 1080 x 2340 pixels, 19.5:9 ratio (~403 ppi density) |
| Protection | Corning Gorilla Glass 3 | Corning Gorilla Glass 3 |
| Features | Infinity-O Display | — |
| Brightness | — | 420 nits (typical), 800 nits (peak) |
Platform
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| OS | Android 10, upgradable to Android 13, One UI 5.1 | — |
| Chipset | Exynos 9611 (10 nm) | Exynos 9611 (10 nm) |
| CPU | Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53) | Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53) |
| GPU | Mali-G72 MP3 | Mali-G72 MP3 |
Memory
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| Card slot | microSDXC (dedicated slot) | microSDXC (dedicated slot) |
| Internal | 64GB 4GB RAM, 128GB 4GB RAM, 128GB 6GB RAM, 128GB 8GB RAM, 256GB 8GB RAM | 64GB 6GB RAM, 128GB 6GB RAM, 128GB 8GB RAM |
| Type | — | UFS 2.1 |
Main Camera
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| Quad | 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) | 64 MP, f/1.8, 26mm (wide), 1/1.72", 0.8µm, PDAF; 8 MP, f/2.2, 123˚ (ultrawide); 5 MP, f/2.4, (macro); 5 MP, f/2.2, (depth) |
| Features | LED flash, panorama, HDR | LED flash, panorama, HDR |
| Video | 4K@30fps, 1080p@30/120fps; gyro-EIS | 4K@30fps, 1080p@30fps |
Selfie Camera
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| Single | 32 MP, f/2.2, 26mm (wide), 1/2.8", 0.8µm | 32 MP, f/2.0, 26mm (wide), 1/2.8", 0.8µm |
| Features | HDR | — |
| Video | 4K@30fps, 1080p@30fps | 4K@30fps, 1080p@30fps |
Battery
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| Type | Li-Po 4000 mAh, non-removable | Li-Po 6000 mAh, non-removable |
| Charging | 15W wired | 15W wired |
Body
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| Dimensions | 158.5 x 73.6 x 7.9 mm (6.24 x 2.90 x 0.31 in) | 159.2 x 75.1 x 8.9 mm (6.27 x 2.96 x 0.35 in) |
| Weight | 172 g (6.07 oz) | 191 g (6.74 oz) |
| Build | Glass front (Gorilla Glass 3), 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) | Dual SIM (Nano-SIM, dual stand-by) |
Comms
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| 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) |
| USB | USB Type-C 2.0 | USB Type-C 2.0 |
| Radio | — | FM radio, RDS, recording |
Launch
| Samsung Galaxy A51 | Samsung Galaxy M31 |
|---|
| Announced | December 12, 2019 | 2020, February 25 |
| Released | December 16, 2019 | — |
| Status | — | Available. Released 2020, March 05 |
| OS | — | Android 10, upgradable to Android 12, One UI 4.1 |
Frequently asked questions
Which has the better battery, Samsung Galaxy A51 or Samsung Galaxy M31?
Samsung Galaxy M31 — 4,000 mAh for the Samsung Galaxy A51 versus 6,000 mAh for the Samsung Galaxy M31.
Which is lighter, Samsung Galaxy A51 or Samsung Galaxy M31?
Samsung Galaxy A51 — 172 g for the Samsung Galaxy A51 versus 191 g for the Samsung Galaxy M31.
Which is newer, Samsung Galaxy A51 or Samsung Galaxy M31?
Samsung Galaxy M31 — Dec 2019 for the Samsung Galaxy A51 versus Mar 2020 for the Samsung Galaxy M31.
Is the Samsung Galaxy A51 or the Samsung Galaxy M31 rated higher?
We rate the Samsung Galaxy A51 7/10 and the Samsung Galaxy M31 7/10.
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