Samsung Galaxy A51 vs Samsung Galaxy S21 Ultra
20Performance37.2
30.8Display56.3
34.7Camera72
29.4Battery46.4
33.3Features78.7
3 spec wins — Samsung Galaxy A5116 spec wins — Samsung Galaxy S21 Ultra
InnoReviews verdict
Samsung Galaxy S21 Ultra wins this phone face-off, 53.9 to 28.3, pulling ahead mainly in features (+45) and camera (+37). Samsung Galaxy A51 still makes sense if its price or standout specs fit your needs better.
Which would you pick?
Key differences
Reasons to pick the Samsung Galaxy A51
- 25% lower weight: 172 g vs 228 g
- 11% lower thickness: 7.9 mm vs 8.9 mm
- Has 3.5mm jack — the other doesn't
- Lower launch price: $399 vs $1,199
Reasons to pick the Samsung Galaxy S21 Ultra
- Stronger performance score: 37 vs 20
- Stronger display score: 56 vs 31
- Stronger camera score: 72 vs 35
- Stronger battery score: 46 vs 29
- Stronger features score: 79 vs 33
Display
| Spec | Samsung Galaxy A51 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Screen size | 6.5 ″ | 6.8 ″+5% |
| Panel type | Super AMOLED | LTPO AMOLED |
| Resolution | 2400x1080 | 3200x1440 |
| Pixel density | 405 ppi | 515 ppi+27% |
| Refresh rate | 60 Hz | 120 Hz+100% |
| Peak brightness | — | 1,500 nits |
| AnTuTu 10 (CPU) | — | 263,424Top 88% |
| AnTuTu 10 (GPU) | — | 126,989Top 82% |
| AnTuTu 10 (Memory) | — | 165,563Top 72% |
| AnTuTu 10 (UX) | — | 227,841Top 82% |
Performance
| Spec | Samsung Galaxy A51 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Chipset | Samsung Exynos 9611 | Samsung Exynos 2100 |
| AnTuTu 10 | 215,000Top 98% | 783,817+265%Top 65% |
| Geekbench 6 (single) | 350Top 99% | 1,430+309%Top 52% |
| Geekbench 6 (multi) | 1,250Top 100% | 3,550+184%Top 56% |
| RAM (max) | 6 GB | 12 GB+100% |
| Storage options | 64GB / 128GB | 128GB / 256GB / 512GB |
| Storage type | UFS 2.0 | UFS 3.1 |
Camera
| Spec | Samsung Galaxy A51 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Main camera | 48 MP | 108 MP+125% |
| Main aperture | f/2.0 | f/1.8 |
| Ultra-wide | 12 MP | 12 MP |
| Telephoto | — | 10 MP |
| Optical zoom | — | 10 x |
| Max video | 4K@30fps | 8K@24fps |
| Front camera | 32 MP | 40 MP+25% |
| OIS | No | Yes |
Battery
| Spec | Samsung Galaxy A51 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Capacity | 4,000 mAh | 5,000 mAh+25% |
| Wired charging | 15 W | 25 W+67% |
| Wireless charging | — | 15 W |
Design
| Spec | Samsung Galaxy A51 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Weight | 172 g+25% | 228 g |
| Thickness | 7.9 mm+11% | 8.9 mm |
| IP rating | — | IP68 |
| Frame material | Plastic | Aluminum |
Connectivity
| Spec | Samsung Galaxy A51 | Samsung Galaxy S21 Ultra |
|---|---|---|
| 5G | No | Yes |
| Wi-Fi | Wi-Fi 5 | Wi-Fi 6E |
| Bluetooth | 5.0 | 5.2 |
| NFC | Yes | Yes |
| USB | USB-C 2.0 | USB-C 3.2 |
| eSIM | No | Yes |
Software
| Spec | Samsung Galaxy A51 | Samsung Galaxy S21 Ultra |
|---|---|---|
| OS at launch | Android 10 (One UI 2) | Android 11 (One UI 3.1) |
| OS update pledge | 3 years | 4 years+33% |
Audio
| Spec | Samsung Galaxy A51 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Stereo speakers | No | Yes |
| 3.5mm jack | Yes | No |
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