Samsung Galaxy S21 vs Xiaomi 15 Ultra
34.4Performance79.1
49.1Display69.1
40.8Camera73.2
36.9Battery79
78.7Features78.7
2 spec wins — Samsung Galaxy S2114 spec wins — Xiaomi 15 Ultra
InnoReviews verdict
Xiaomi 15 Ultra wins this phone face-off, 75.9 to 43.6, pulling ahead mainly in performance (+45) and battery (+42). Samsung Galaxy S21 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 S21
- 24% lower weight: 171 g vs 226 g
- 16% lower thickness: 7.9 mm vs 9.4 mm
- Lower launch price: $799 vs $1,499
Reasons to pick the Xiaomi 15 Ultra
- Stronger performance score: 79 vs 34
- Stronger display score: 69 vs 49
- Stronger camera score: 73 vs 41
- Stronger battery score: 79 vs 37
- 433% higher Wireless charging: 80 W vs 15 W
Display
| Spec | Samsung Galaxy S21 | Xiaomi 15 Ultra |
|---|---|---|
| Screen size | 6.2 ″ | 6.73 ″+9% |
| Panel type | AMOLED | LTPO AMOLED |
| Resolution | 2400x1080 | 1440x3200 |
| Pixel density | 421 ppi | 522 ppi+24% |
| Refresh rate | 120 Hz | 120 Hz |
| Peak brightness | 1,300 nits | 3,200 nits+146% |
| Screen-to-body | — | 90 % |
| AnTuTu 10 (CPU) | 252,025Top 94% | — |
| AnTuTu 10 (GPU) | 127,819Top 79% | — |
| AnTuTu 10 (Memory) | 144,909Top 91% | — |
| AnTuTu 10 (UX) | 221,794Top 88% | — |
Performance
| Spec | Samsung Galaxy S21 | Xiaomi 15 Ultra |
|---|---|---|
| Chipset | Samsung Exynos 2100 | Snapdragon 8 Elite |
| AnTuTu 10 | 746,547Top 66% | 2,650,000+255%Top 4% |
| Geekbench 6 (single) | 1,430Top 52% | 3,050+113%Top 7% |
| Geekbench 6 (multi) | 3,550Top 56% | 9,600+170%Top 5% |
| RAM (max) | 8 GB | 16 GB+100% |
| Storage options | 128GB / 256GB | 256/512GB/1TB |
| Storage type | UFS 3.1 | UFS 4.1 |
Camera
| Spec | Samsung Galaxy S21 | Xiaomi 15 Ultra |
|---|---|---|
| Main camera | 12 MP | 50 MP+317% |
| Main aperture | f/1.8 | f/1.63 |
| Ultra-wide | 12 MP | 50 MP+317% |
| Telephoto | 64 MP | 200 MP+213% |
| Optical zoom | — | 4.3 x |
| Max video | 8K@24fps | 8K@30fps |
| Front camera | 10 MP | 32 MP+220% |
| OIS | Yes | Yes |
Battery
| Spec | Samsung Galaxy S21 | Xiaomi 15 Ultra |
|---|---|---|
| Capacity | 4,000 mAh | 5,410 mAh+35% |
| Wired charging | 25 W | 90 W+260% |
| Wireless charging | 15 W | 80 W+433% |
| Active use endurance | — | 12 h |
Design
| Spec | Samsung Galaxy S21 | Xiaomi 15 Ultra |
|---|---|---|
| Weight | 171 g+24% | 226 g |
| Thickness | 7.9 mm+16% | 9.4 mm |
| IP rating | IP68 | IP68 |
| Frame material | Aluminum | Aluminum |
Connectivity
| Spec | Samsung Galaxy S21 | Xiaomi 15 Ultra |
|---|---|---|
| 5G | Yes | Yes |
| Wi-Fi | Wi-Fi 6 | Wi-Fi 7 |
| Bluetooth | 5.0 | 6.0 |
| NFC | Yes | Yes |
| USB | USB-C 3.2 | USB-C 3.2 |
| eSIM | Yes | Yes |
Software
| Spec | Samsung Galaxy S21 | Xiaomi 15 Ultra |
|---|---|---|
| OS at launch | Android 11 (One UI 3.1) | Android 15 (HyperOS 2) |
| OS update pledge | 4 years | 4 years |
Audio
| Spec | Samsung Galaxy S21 | Xiaomi 15 Ultra |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |