Redmi 15 vs Samsung Galaxy S21 Ultra
21.8Performance37.2
50.5Display56.3
29Camera72
66.7Battery46.4
28Features78.7
6 spec wins — Redmi 1512 spec wins — Samsung Galaxy S21 Ultra
InnoReviews verdict
Samsung Galaxy S21 Ultra wins this phone face-off, 53.9 to 38.6, pulling ahead mainly in features (+51) and camera (+43). Redmi 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 15
- Stronger battery score: 67 vs 46
- 40% higher capacity: 7,000 mAh vs 5,000 mAh
- 32% higher Wired charging: 33 W vs 25 W
- 20% higher Refresh rate: 144 Hz vs 120 Hz
Reasons to pick the Samsung Galaxy S21 Ultra
- Stronger performance score: 37 vs 22
- Stronger display score: 56 vs 51
- Stronger camera score: 72 vs 29
- Stronger features score: 79 vs 28
- 400% higher Front camera: 40 MP vs 8 MP
Display
| Spec | Redmi 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Screen size | 6.9 ″+1% | 6.8 ″ |
| Panel type | IPS LCD | LTPO AMOLED |
| Resolution | 1080x2340 | 3200x1440 |
| Pixel density | 374 ppi | 515 ppi+38% |
| Refresh rate | 144 Hz+20% | 120 Hz |
| Peak brightness | 850 nits | 1,500 nits+76% |
Performance
| Spec | Redmi 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Chipset | Snapdragon 685 | Samsung Exynos 2100 |
| AnTuTu | — | 783,817Bottom 19% |
| AnTuTu 11 (CPU) | — | 263,424Bottom 14% |
| AnTuTu 11 (GPU) | — | 126,989Bottom 29% |
| AnTuTu 11 (Memory) | — | 165,563Bottom 31% |
| AnTuTu 11 (UX) | — | 227,841Bottom 17% |
| Geekbench 6 (single) | 474Bottom 10% | 1,430+202%Top 48% |
| Geekbench 6 (multi) | 1,620Bottom 10% | 3,550+119%Bottom 48% |
| Wild Life Extreme stability | 99 %Top 40% | — |
| RAM (max) | 8 GB | 12 GB+50% |
| Storage options | 128/256GB | 128GB / 256GB / 512GB |
| Storage type | UFS 2.2 | UFS 3.1 |
Camera
| Spec | Redmi 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Main camera | 50 MP | 108 MP+116% |
| Main aperture | f/1.8 | f/1.8 |
| Ultra-wide | — | 12 MP |
| Telephoto | — | 10 MP |
| Optical zoom | — | 10 x |
| Max video | 1080p@30fps | 8K@24fps |
| Front camera | 8 MP | 40 MP+400% |
| OIS | No | Yes |
Battery
| Spec | Redmi 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Capacity | 7,000 mAh+40% | 5,000 mAh |
| Wired charging | 33 W+32% | 25 W |
| Wireless charging | — | 15 W |
Design
| Spec | Redmi 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Weight | 214 g+6% | 228 g |
| Thickness | 8.4 mm+6% | 8.9 mm |
| IP rating | IP64 | IP68 |
| Frame material | Plastic | Aluminum |
Connectivity
| Spec | Redmi 15 | 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 | Redmi 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| OS at launch | Android 15 (HyperOS 2) | Android 11 (One UI 3.1) |
| OS update pledge | 2 years | 4 years+100% |
Audio
| Spec | Redmi 15 | Samsung Galaxy S21 Ultra |
|---|---|---|
| Stereo speakers | No | Yes |
| 3.5mm jack | No | No |