Samsung Galaxy A51 vs Xiaomi Redmi Note 9 Pro
A spec-by-spec comparison of the Samsung Galaxy A51 and the Xiaomi Redmi Note 9 Pro, taken from their full specification sheets. Green marks the better value in each measured row.
VS
Head to head
| Samsung Galaxy A51 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| Price | $79 | $180 |
| Our rating | 7/10 | 7/10 |
| Battery | 4,000 mAh | 5,020 mAh |
| Wired charging | 15W | 30W |
| RAM (max) | 8 GB | 8 GB |
| Storage (max) | 256 GB | 128 GB |
| Screen size | 6.5 in | 6.67 in |
| Main camera | 48 MP | 64 MP |
| Weight (lower is lighter) | 172 g | 209 g |
| Released | Dec 2019 | May 2020 |
Summary: Samsung Galaxy A51 is ahead on storage (max), weight (lower is lighter). Xiaomi Redmi Note 9 Pro is ahead on battery, wired charging, screen size, main camera.
★ Which should you buy? Xiaomi Redmi Note 9 Pro is the stronger overall pick on the measured specs. If budget matters more than the extra capability, Samsung Galaxy A51 is the cheaper option.
Display
| Samsung Galaxy A51 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| Type | Super AMOLED, 16M colors | IPS LCD, 450 nits (typ) |
| Size | 6.5 inches, 102.0 cm² (~87.4% screen-to-body ratio) | 6.67 inches, 107.4 cm2 (~84.5% screen-to-body ratio) |
| Resolution | 1080 x 2400 pixels, 20:9 ratio (~405 ppi density) | 1080 x 2400 pixels, 20:9 ratio (~395 ppi density) |
| Protection | Corning Gorilla Glass 3 | Corning Gorilla Glass 5 |
| Features | Infinity-O Display | — |
| Refresh Rate | — | 60Hz |
Platform
| Samsung Galaxy A51 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| OS | Android 10, upgradable to Android 13, One UI 5.1 | Android 10, MIUI 11 (upgradable to Android 12, MIUI 14) |
| Chipset | Exynos 9611 (10 nm) | Qualcomm SM7125 Snapdragon 720G (8 nm) |
| CPU | Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53) | Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver) |
| GPU | Mali-G72 MP3 | Adreno 618 |
Memory
| Samsung Galaxy A51 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| 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 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| 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/1.9, 26mm (wide), 1/1.72", 0.8µm, PDAF; 8 MP, f/2.2, 119˚ (ultrawide), 1/4.0", 1.12µm; 5 MP, f/2.4, (macro), AF; 2 MP, f/2.4, (depth) |
| Features | LED flash, panorama, HDR | LED flash, HDR, panorama |
| Video | 4K@30fps, 1080p@30/120fps; gyro-EIS | 4K@30fps, 1080p@30/60/120fps, 720p@960fps, gyro-EIS |
Selfie Camera
| Samsung Galaxy A51 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| Single | 32 MP, f/2.2, 26mm (wide), 1/2.8", 0.8µm | 16 MP, f/2.5, (wide), 1/3.06" 1.0µm |
| Features | HDR | HDR, panorama |
| Video | 4K@30fps, 1080p@30fps | 1080p@30fps |
Battery
| Samsung Galaxy A51 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| Type | Li-Po 4000 mAh, non-removable | Li-Po 5020 mAh, non-removable |
| Charging | 15W wired | 30W wired, 50% in 30 min (advertised) |
Body
| Samsung Galaxy A51 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| Dimensions | 158.5 x 73.6 x 7.9 mm (6.24 x 2.90 x 0.31 in) | 165.8 x 76.7 x 8.8 mm (6.53 x 3.02 x 0.35 in) |
| Weight | 172 g (6.07 oz) | 209 g (7.37 oz) |
| Build | Glass front (Gorilla Glass 3), plastic back, plastic frame | Glass front (Gorilla Glass 5), glass back (Gorilla Glass 5), 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 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| 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, NavIC |
| NFC | Yes (market/region dependent) | Yes |
| USB | USB Type-C 2.0 | USB Type-C 2.0, OTG |
| Infrared port | — | Yes |
| Radio | — | FM radio |
Launch
| Samsung Galaxy A51 | Xiaomi Redmi Note 9 Pro | |
|---|---|---|
| Announced | December 12, 2019 | 2020, April 30 |
| Released | December 16, 2019 | — |
| Status | — | Available. Released 2020, May 05 |
Frequently asked questions
Which has the better battery, Samsung Galaxy A51 or Xiaomi Redmi Note 9 Pro?
Xiaomi Redmi Note 9 Pro — 4,000 mAh for the Samsung Galaxy A51 versus 5,020 mAh for the Xiaomi Redmi Note 9 Pro.
Which is lighter, Samsung Galaxy A51 or Xiaomi Redmi Note 9 Pro?
Samsung Galaxy A51 — 172 g for the Samsung Galaxy A51 versus 209 g for the Xiaomi Redmi Note 9 Pro.
Which is newer, Samsung Galaxy A51 or Xiaomi Redmi Note 9 Pro?
Xiaomi Redmi Note 9 Pro — Dec 2019 for the Samsung Galaxy A51 versus May 2020 for the Xiaomi Redmi Note 9 Pro.
Is the Samsung Galaxy A51 or the Xiaomi Redmi Note 9 Pro rated higher?
We rate the Samsung Galaxy A51 7/10 and the Xiaomi Redmi Note 9 Pro 7/10.