Samsung Galaxy S25 Ultra vs Xiaomi Xiaomi 15
Side-by-side comparison of viewing distance, PPI, and specifications
Samsung Galaxy S25 Ultra
6.9" · 1440×3120 · AMOLED
Optimal Viewing Distance 18cm
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Category Ranking
Pixel Density (PPI)28in category
Samsung Galaxy S25 Ultra498 PPI #6
Xiaomi Xiaomi 15460 PPI #14
368 PPI521 PPI
HDR Peak Brightness28in category
Samsung Galaxy S25 Ultra2600 nits #17
Xiaomi Xiaomi 153200 nits #5
2000 nits4500 nits
DCI-P3 Color Gamut28in category
Samsung Galaxy S25 Ultra100% #1
Xiaomi Xiaomi 15100% #1
100%100%
Refresh Rate
Samsung Galaxy S25 Ultra120 Hz
Xiaomi Xiaomi 15120 Hz
StandardHighUltra
Summary
- Sharpness: no visible difference — Both screens exceed the retina threshold at 30cm. The Samsung Galaxy S25 Ultra has 8% higher pixel density (498 vs 460 PPI), but this only becomes visible below 18cm.
- Brightness: advantage Samsung Galaxy S25 Ultra — The Samsung Galaxy S25 Ultra is 46% brighter in SDR (800 vs 549 nits), a noticeable difference for outdoor readability. HDR peak: 2600 vs 3200 nits.
Key Differences
| Specification | Samsung Galaxy S25 Ultra | Xiaomi Xiaomi 15 |
|---|---|---|
| Screen Size | 6.9" | 6.36" |
| Resolution | 1440×3120 | 1200×2670 |
| Pixel Density (PPI) | 498 | 460 |
| Optimal Viewing Distance | 18cm | 19cm |
| SDR Brightness | 800 nits | 549 nits |
| HDR Peak Brightness | 2600 nits | 3200 nits |
All specifications
| Specification | Samsung Galaxy S25 Ultra 2025 | Xiaomi Xiaomi 15 2025 |
|---|---|---|
| Screen Size | 6.9" (Better) | 6.36" |
| Resolution | 1440×3120 (Better) | 1200×2670 |
| Pixel Density (PPI) | 498 (Better) | 460 |
| Optimal Viewing Distance | 18cm (Better) | 19cm |
| Panel Type | AMOLED | AMOLED |
| Viewing Angle | 178° | 178° |
| Aspect Ratio | 6:13 | 40:89 |
| 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 | 800 nits (Better) | 549 nits |
| 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 Ultra or Xiaomi Xiaomi 15?
The Samsung Galaxy S25 Ultra has 498 PPI compared to 460 PPI for the Xiaomi Xiaomi 15.
Which has a closer optimal viewing distance?
The Samsung Galaxy S25 Ultra requires 18cm vs 19cm for the Xiaomi Xiaomi 15 to reach retina quality.
Related Comparisons
Apple iPhone 16 2024 · 461 PPI · 6.1" · 60 Hz
vs Samsung Galaxy S25 Ultra 2025 · 498 PPI · 6.9" · 120 Hz
Apple iPhone 16 2024 · 461 PPI · 6.1" · 60 Hz
vs Xiaomi Xiaomi 15 2025 · 460 PPI · 6.36" · 120 Hz
Apple iPhone 16 Plus 2024 · 460 PPI · 6.7" · 60 Hz
vs Samsung Galaxy S25 Ultra 2025 · 498 PPI · 6.9" · 120 Hz
Apple iPhone 16 Plus 2024 · 460 PPI · 6.7" · 60 Hz
vs Xiaomi Xiaomi 15 2025 · 460 PPI · 6.36" · 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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