REDMI Note 15 5G vs Samsung Galaxy S21 Ultra
35.3Performance37.2
64Display56.3
48.3Camera72
57.4Battery46.4
70.7Features78.7
5 spec wins — REDMI Note 15 5G8 spec wins — Samsung Galaxy S21 Ultra
InnoReviews verdict
Samsung Galaxy S21 Ultra wins this phone face-off, 53.9 to 51.6, pulling ahead mainly in camera (+24) and features (+8). REDMI Note 15 5G still makes sense if its price or standout specs fit your needs better.
Which would you pick?
Key differences
Reasons to pick the REDMI Note 15 5G
- Stronger display score: 64 vs 56
- Stronger battery score: 57 vs 46
- 113% higher Peak brightness: 3,200 nits vs 1,500 nits
- 80% higher Wired charging: 45 W vs 25 W
- 22% lower weight: 178 g vs 228 g
Reasons to pick the Samsung Galaxy S21 Ultra
- Stronger camera score: 72 vs 48
- Stronger features score: 79 vs 71
- 100% higher Front camera: 40 MP vs 20 MP
- 50% higher ultra-wide: 12 MP vs 8 MP
- 41% higher Geekbench 6 (single): 1,430 vs 1,017
Display
| Spec | REDMI Note 15 5G | Samsung Galaxy S21 Ultra |
|---|---|---|
| Screen size | 6.77 ″ | 6.8 ″ |
| Panel type | AMOLED | LTPO AMOLED |
| Resolution | 1080x2392 | 3200x1440 |
| Pixel density | 388 ppi | 515 ppi+33% |
| Refresh rate | 120 Hz | 120 Hz |
| Peak brightness | 3,200 nits+113% | 1,500 nits |
| Screen-to-body | 92 % | — |
Performance
| Spec | REDMI Note 15 5G | Samsung Galaxy S21 Ultra |
|---|---|---|
| Chipset | Snapdragon 6 Gen 3 | Samsung Exynos 2100 |
| AnTuTuDifferent AnTuTu versions — not compared | 857,561 | 783,817Bottom 22% |
| AnTuTu 11 (CPU) | — | 263,424Bottom 17% |
| AnTuTu 11 (GPU) | — | 126,989Bottom 33% |
| AnTuTu 11 (Memory) | — | 165,563Bottom 35% |
| AnTuTu 11 (UX) | — | 227,841Bottom 20% |
| Geekbench 6 (single) | 1,017Bottom 33% | 1,430+41%Top 46% |
| Geekbench 6 (multi) | 2,963Bottom 39% | 3,550+20%Bottom 50% |
| Wild Life Extreme stability | 100 %Top 13% | — |
| RAM (max) | 12 GB | 12 GB |
| Storage options | 128/256/512GB | 128GB / 256GB / 512GB |
| Storage type | UFS 2.2 | UFS 3.1 |
Camera
| Spec | REDMI Note 15 5G | Samsung Galaxy S21 Ultra |
|---|---|---|
| Main camera | 108 MP | 108 MP |
| Main aperture | f/1.7 | f/1.8 |
| Ultra-wide | 8 MP | 12 MP+50% |
| Telephoto | — | 10 MP |
| Optical zoom | — | 10 x |
| Max video | 4K@30fps | 8K@24fps |
| Front camera | 20 MP | 40 MP+100% |
| OIS | Yes | Yes |
Battery
| Spec | REDMI Note 15 5G | Samsung Galaxy S21 Ultra |
|---|---|---|
| Capacity | 5,520 mAh+10% | 5,000 mAh |
| Wired charging | 45 W+80% | 25 W |
| Wireless charging | 0 W | 15 W |
Design
| Spec | REDMI Note 15 5G | Samsung Galaxy S21 Ultra |
|---|---|---|
| Weight | 178 g+22% | 228 g |
| Thickness | 7.4 mm+17% | 8.9 mm |
| IP rating | IP65/IP66 | IP68 |
| Frame material | Plastic | Aluminum |
Connectivity
| Spec | REDMI Note 15 5G | Samsung Galaxy S21 Ultra |
|---|---|---|
| 5G | Yes | Yes |
| Wi-Fi | Wi-Fi 5 | Wi-Fi 6E |
| Bluetooth | 5.1 | 5.2 |
| NFC | Yes | Yes |
| USB | USB-C 2.0 | USB-C 3.2 |
| eSIM | No | Yes |
Software
| Spec | REDMI Note 15 5G | Samsung Galaxy S21 Ultra |
|---|---|---|
| OS at launch | Android 15 (HyperOS 2) | Android 11 (One UI 3.1) |
| OS update pledge | 4 years | 4 years |
Audio
| Spec | REDMI Note 15 5G | Samsung Galaxy S21 Ultra |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |
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