Samsung Galaxy S25 vs Xiaomi Xiaomi 15 Ultra
Side-by-side comparison of viewing distance, PPI, and specifications
Xiaomi Xiaomi 15 Ultra
6.73" · 1440×3200 · AMOLED
Optimal Viewing Distance 17cm
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Category Ranking
Pixel Density (PPI)28in category
Samsung Galaxy S25416 PPI #25
Xiaomi Xiaomi 15 Ultra521 PPI #1
368 PPI521 PPI
HDR Peak Brightness28in category
Samsung Galaxy S252600 nits #17
Xiaomi Xiaomi 15 Ultra3200 nits #5
2000 nits4500 nits
DCI-P3 Color Gamut28in category
Samsung Galaxy S25100% #1
Xiaomi Xiaomi 15 Ultra100% #1
100%100%
Refresh Rate
Samsung Galaxy S25120 Hz
Xiaomi Xiaomi 15 Ultra120 Hz
StandardHighUltra
Summary
- Sharpness: no visible difference — Both screens exceed the retina threshold at 30cm. The Xiaomi Xiaomi 15 Ultra has 20% higher pixel density (521 vs 416 PPI), but this only becomes visible below 17cm.
- Brightness: advantage Xiaomi Xiaomi 15 Ultra — Similar SDR brightness (747 vs 800 nits), but the Xiaomi Xiaomi 15 Ultra leads in HDR peak (3200 vs 2600 nits).
Key Differences
| Specification | Samsung Galaxy S25 | Xiaomi Xiaomi 15 Ultra |
|---|---|---|
| Screen Size | 6.2" | 6.73" |
| Resolution | 1080×2340 | 1440×3200 |
| Pixel Density (PPI) | 416 | 521 |
| Optimal Viewing Distance | 21cm | 17cm |
| SDR Brightness | 747 nits | 800 nits |
| HDR Peak Brightness | 2600 nits | 3200 nits |
All specifications
| Specification | Samsung Galaxy S25 2025 | Xiaomi Xiaomi 15 Ultra 2025 |
|---|---|---|
| Screen Size | 6.2" | 6.73" (Better) |
| Resolution | 1080×2340 | 1440×3200 (Better) |
| Pixel Density (PPI) | 416 | 521 (Better) |
| Optimal Viewing Distance | 21cm | 17cm (Better) |
| Panel Type | AMOLED | AMOLED |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 6:13 | 9:20 |
| Refresh Rate | 120 Hz | 120 Hz |
| Variable Refresh Rate (VRR) | None | None |
| Response Time | 1 ms GTG | 1 ms GTG |
| HDR Certification | None | None |
| SDR Brightness | 747 nits | 800 nits (Better) |
| HDR Peak Brightness | 2600 nits | 3200 nits (Better) |
| Contrast Ratio | 1:1,000,000 | 1:1,000,000 |
| Ports | USB-C | USB-C |
| Color Gamut | sRGB 100% · DCI-P3 100% | sRGB 100% · DCI-P3 100% |
| Year | 2025 | 2025 |
Frequently Asked Questions
Which has better PPI: Samsung Galaxy S25 or Xiaomi Xiaomi 15 Ultra?
The Xiaomi Xiaomi 15 Ultra has 521 PPI compared to 416 PPI for the Samsung Galaxy S25.
Which has a closer optimal viewing distance?
The Xiaomi Xiaomi 15 Ultra requires 17cm vs 21cm for the Samsung Galaxy S25 to reach retina quality.
Related Comparisons
Apple iPhone 16 2024 · 461 PPI · 6.1" · 60 Hz
vs Samsung Galaxy S25 2025 · 416 PPI · 6.2" · 120 Hz
Apple iPhone 16 2024 · 461 PPI · 6.1" · 60 Hz
vs Xiaomi Xiaomi 15 Ultra 2025 · 521 PPI · 6.73" · 120 Hz
Apple iPhone 16 Plus 2024 · 460 PPI · 6.7" · 60 Hz
vs Samsung Galaxy S25 2025 · 416 PPI · 6.2" · 120 Hz
Apple iPhone 16 Plus 2024 · 460 PPI · 6.7" · 60 Hz
vs Xiaomi Xiaomi 15 Ultra 2025 · 521 PPI · 6.73" · 120 Hz
Methodology & Sources
Formula: Retina distance (cm) = 3438 / PPI. Displayed values are rounded for readability.
Sources: Official manufacturer spec sheets and product pages. Specs are normalized before comparisons.
Comparison winners are calculated metric by metric (higher is better for most specs; lower is better for distance/response time).
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