REDMI Note 15 vs Samsung Galaxy S21 Ultra
21.8Performance37.2
65.5Display56.3
36.4Camera72
57.3Battery46.4
60Features78.7
5 spec wins — REDMI Note 1510 spec wins — Samsung Galaxy S21 Ultra
InnoReviews verdict
Samsung Galaxy S21 Ultra wins this phone face-off, 53.9 to 44.4, pulling ahead mainly in camera (+36) and features (+19). REDMI Note 15 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
- Stronger display score: 66 vs 56
- Stronger battery score: 57 vs 46
- 113% higher Peak brightness: 3,200 nits vs 1,500 nits
- 32% higher Wired charging: 33 W vs 25 W
- 20% higher capacity: 6,000 mAh vs 5,000 mAh
Reasons to pick the Samsung Galaxy S21 Ultra
- Stronger performance score: 37 vs 22
- Stronger camera score: 72 vs 36
- Stronger features score: 79 vs 60
- 100% higher Front camera: 40 MP vs 20 MP
- 94% higher Geekbench 6 (single): 1,430 vs 738
Display
| Spec | REDMI Note 15 | 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 | 93.7 % | — |
Performance
| Spec | REDMI Note 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Chipset | MediaTek Helio G100 Ultra | Samsung Exynos 2100 |
| AnTuTu | — | 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) | 738Bottom 16% | 1,430+94%Top 46% |
| Geekbench 6 (multi) | 1,990Bottom 17% | 3,550+78%Bottom 50% |
| RAM (max) | 8 GB | 12 GB+50% |
| Storage options | 128/256/512GB | 128GB / 256GB / 512GB |
| Storage type | UFS 2.2 | UFS 3.1 |
Camera
| Spec | REDMI Note 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Main camera | 108 MP | 108 MP |
| Main aperture | f/1.7 | f/1.8 |
| Ultra-wide | — | 12 MP |
| Telephoto | — | 10 MP |
| Optical zoom | — | 10 x |
| Max video | 1080p@60fps | 8K@24fps |
| Front camera | 20 MP | 40 MP+100% |
| OIS | No | Yes |
Battery
| Spec | REDMI Note 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Capacity | 6,000 mAh+20% | 5,000 mAh |
| Wired charging | 33 W+32% | 25 W |
| Wireless charging | 0 W | 15 W |
Design
| Spec | REDMI Note 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Weight | 184 g+19% | 228 g |
| Thickness | 7.9 mm+11% | 8.9 mm |
| IP rating | IP64 | IP68 |
| Frame material | Plastic | Aluminum |
Connectivity
| Spec | REDMI Note 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| 5G | No | Yes |
| Wi-Fi | Wi-Fi 5 | Wi-Fi 6E |
| Bluetooth | 5.3 | 5.2 |
| NFC | Yes | Yes |
| USB | USB-C 2.0 | USB-C 3.2 |
| eSIM | No | Yes |
Software
| Spec | REDMI Note 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| OS at launch | Android 15 (HyperOS 2) | Android 11 (One UI 3.1) |
| OS update pledge | — | 4 years |
Audio
| Spec | REDMI Note 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Stereo speakers | Yes | Yes |
| 3.5mm jack | No | No |
Related comparisons
REDMI Note 15vs iQOO Z10R 5GVSREDMI Note 15vs iQOO Z9 5G (India)VSREDMI Note 15vs realme 13 Pro 5GVSREDMI Note 15vs realme P1 5GVSSamsung Galaxy S21 Ultravs realme P4 Power 5GVSSamsung Galaxy S21 Ultravs TECNO POVA Curve 2 5GVSSamsung Galaxy S21 Ultravs Motorola Edge 50 ProVSSamsung Galaxy S21 Ultravs iPhone 16eVS