Nothing Phone (3a) vs Xiaomi 15

Nothing Phone (3a)

Nothing

Very Good

Xiaomi 15

Xiaomi

7.8

Good

What Reviewers Agree On

The camera system is extraordinary for the price — a telephoto lens at $349 is genuinely unprecedented in the budget segment
Nothing OS delivers the most charming and distinctive software experience in the budget category, with minimal bloat
The 5,000mAh battery provides excellent two-day endurance with light use and easy all-day life with heavy use
The transparent design with Glyph lighting makes it the most visually distinctive phone at any price, let alone $349
Value proposition is outstanding — no competitor matches its camera versatility and software quality at this price

Deal Breakers

Only IP54 splash resistance — no submersion protection, which several competitors offer at this price
Mono speaker is a noticeable downgrade from stereo speakers found on budget competitors like the Pixel 9a

Detailed Comparison

Display

Nothing Phone (3a)

The 6.7-inch AMOLED with 120Hz refresh rate delivers vivid colors and smooth performance that belies the budget price.

The 6.7-inch AMOLED panel with 120Hz is bright, vivid, and responsive — you'd never guess this is a $349 phone from the display alone
Peak brightness is adequate for outdoor use but falls short of flagship-level phones — direct sunlight readability is good but not exceptional
Colors are accurate in the default profile with excellent contrast — HDR content looks surprisingly good on this panel

Xiaomi 15

The 6.36-inch 1.5K LTPO OLED is sharp, vibrant, and incredibly bright at 3,200 nits peak (tested up to 3,593 nits HDR). Ultra-narrow 1.38mm bezels and high-frequency PWM dimming above 3,000Hz round out an excellent display package, though OLED smear at lower brightness is a noted concern.

Peak brightness tested at 3,593 nits in HDR — among the brightest compact phone displays available
Ultra-narrow 1.38mm bezels with excellent color accuracy in Original Color PRO profile

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What Reviewers Agree On

One of the best compact Android flagships available in 2025
Battery life is a major upgrade over the Xiaomi 14 — excellent endurance from the 5,400mAh cell
Snapdragon 8 Elite delivers top-tier performance for daily tasks and gaming
Main Leica camera produces excellent photos with natural color science
Design is premium but very iterative over the Xiaomi 14

Deal Breakers

Thermal throttling under sustained loads — phone gets uncomfortably hot during extended gaming
Not available in the US — import prices eliminate the value advantage
Ultrawide camera quality is noticeably poor compared to main and telephoto lenses

Camera

Nothing Phone (3a)

The standout feature — a triple camera system with 50MP telephoto at $349 that no budget competitor can match.

A 50MP telephoto with 2x optical zoom at $349 is unprecedented — no budget phone offers a dedicated zoom lens, and the results are genuinely impressive
The 50MP main sensor produces detailed, well-exposed photos with natural colors that compete with phones costing twice as much
Low-light photography is adequate but expectedly falls behind Pixel's computational processing — noise is more visible in dim conditions
Video recording at 4K30 is solid with decent stabilization, though the lack of 4K60 is a limitation some users will notice

Xiaomi 15

The triple 50MP Leica system shines with its main sensor and improved 2.6x telephoto, earning a DxOMark score of 146. Leica color profiles produce natural, pleasing images with excellent dynamic range. The ultrawide camera is the clear weakness, with noticeably more noise in low light and no autofocus.

50MP main Leica Summilux camera delivers excellent photo quality with natural colors and strong dynamic range
2.6x optical telephoto is a meaningful upgrade over the Xiaomi 14 — sharp and versatile
Ultrawide camera is the weakest link — subpar quality, no autofocus, noticeably more noise in low light
DxOMark camera score of 146 — good but not class-leading among 2025 flagships

Performance

Nothing Phone (3a)

The Snapdragon 7s Gen 3 with 8GB RAM handles everyday tasks smoothly, though it shows its limits with demanding gaming.

Day-to-day performance is smooth and responsive — apps open quickly, multitasking is adequate, and Nothing OS animations are fluid
Casual gaming runs well, but demanding titles like Genshin Impact need reduced settings for a smooth experience
8GB RAM ensures good app retention for moderate multitasking, though heavy users may notice occasional reloads

Xiaomi 15

The Snapdragon 8 Elite with 12GB RAM delivers flagship-tier performance that's smooth and snappy for everyday use, gaming, and multitasking. However, the compact body struggles to dissipate heat under sustained loads, causing notable thermal throttling during extended gaming sessions.

Snapdragon 8 Elite scores ~2,990 single-core and ~9,114 multi-core on Geekbench 6 — genuinely fast
Thermal throttling is a real issue — fails to complete 3DMark GPU stress tests and gets uncomfortably hot
CPU throttles to 72-77% of peak under sustained load — compact chassis limits cooling capacity