Xiaomi 15 UltravsRealme C75
SETTLEDUpdated September 8, 2026
Xiaomi 15 Ultra wins
Verdict
Xiaomi 15 Ultra wins 4 of 5 categories — our overall pick
Xiaomi 15 Ultra is the overall winner, 4 / 5 — performance is its standout. It costs USD 1,399 — USD 1,200 more than the Realme C75. Pay the premium if performance is your priority.
- Xiaomi 15 Ultra takes Performance — led by performance score (2,500,000 pts).
- Xiaomi 15 Ultra takes Display — led by pixel density (522 ppi).
- Xiaomi 15 Ultra takes Camera — led by telephoto (Yes).
- Xiaomi 15 Ultra takes Battery — led by wireless charging (Yes).
- Realme C75 takes Price — led by price (199 USD).
Scores follow our published methodology · v2026.09
In plain English
Choose Xiaomi 15 Ultra if you want…
- Choose Xiaomi 15 Ultra if you want a faster phone for apps and games — 2,500,000 pts vs 450,000 pts.
- Choose Xiaomi 15 Ultra if you want more apps open at once — 16 GB vs 8 GB.
- Choose Xiaomi 15 Ultra if you want more room for photos and apps — 512 GB vs 256 GB.
- Choose Xiaomi 15 Ultra if you want a sharper screen — 522 ppi vs 260 ppi.
- Choose Xiaomi 15 Ultra if you want smoother scrolling — 120 Hz vs 90 Hz.
- Choose Xiaomi 15 Ultra if you want a screen you can read in sunlight — 3,200 nits vs 550 nits.
- Choose Xiaomi 15 Ultra if you want sharper selfies — 32 MP vs 8 MP.
- Choose Xiaomi 15 Ultra if you want true optical zoom — Yes vs No.
- Choose Xiaomi 15 Ultra if you want better video quality — 96 pts vs 48 pts.
- Choose Xiaomi 15 Ultra if you want a better camera — 155 pts vs 76 pts.
- Choose Xiaomi 15 Ultra if you want faster charging — 90 W vs 45 W.
- Choose Xiaomi 15 Ultra if you want the convenience of wireless charging — Yes vs No.
Choose Realme C75 if you want…
- Choose Realme C75 if you want longer battery life — 6,000 mAh vs 5,410 mAh.
- Choose Realme C75 if you want a lower price — 199 USD vs 1,399 USD.
At a glance
- Xiaomi 15 Ultra
- Realme C75
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Best price now
The cheap alternative
Full record
Every spec, side by side — winners get a check and a proportional bar. Ties share the badge.
Performance score
Approximate benchmark score of the chipset — higher is faster for apps, games and AI.
Chipset
The processor inside — shown for reference, never decides a winner.
RAM
More RAM keeps more apps alive in the background.
Storage
Base onboard storage for photos, apps and media.
Screen size
Diagonal screen size — bigger is better for media, smaller is easier to hold.
Pixel density
Sharpness of the screen — above ~400 ppi looks crisp.
Refresh rate
How smooth scrolling and motion feel. 120 Hz is the modern standard.
Peak brightness
Peak brightness in sunlight — higher stays readable outdoors.
Main camera
Resolution of the primary rear camera — photo quality is judged by the Camera quality score, not megapixels.
Selfie camera
Resolution of the front camera.
Telephoto
A dedicated zoom lens for distant subjects without quality loss.
Video score
Composite video rating — stabilisation, 4K/8K support and colour.
Camera score
Composite camera quality from independent testing — how good the photos actually are.
Battery
Battery capacity — higher generally lasts longer.
Charging speed
Wired charging speed — higher refills faster.
Wireless charging
Whether the phone charges wirelessly.
Price
Typical MSRP in US dollars — lower is better value.
Which one should you buy?
Xiaomi 15 Ultra
Choose Xiaomi 15 Ultra if performance matters most — it wins the most categories overall. It costs USD 1,399.
Realme C75
Choose Realme C75 if price matters most. It costs USD 199, the lowest price in this group.
Pros & cons
Xiaomi 15 Ultra
- Best-in-class zoom
- Elite chipset
- 5,410 mAh + 90 W
- Very expensive
- Heavy
- Software bloat
Realme C75
- 6,000 mAh battery
- 45 W charging
- IP69 water resistance
- Helio G92 Max is basic
- 720p-class display
- No 5G