Nothing Phone (4a) Pro vs Xiaomi 15

Nothing Phone (4a) Pro

A 6.83-inch 1.5K AMOLED at 144Hz with 2,160Hz PWM dimming — reviewers agree it's the best screen Nothing has built, with realistic outdoor brightness around 1,600 nits. The headline 5,000-nit peak, though, only materialises with special HDR test files; everyday brightness is far lower.

• Nothing's best-ever display: a 144Hz panel with 1,600 nits of outdoor brightness and a claimed 5,000 nits peak; the main camera is solid too with nice detail and well-reproduced colours.
• A claimed 1,600-nit outdoor brightness is realistic — no major visibility issues outdoors even in strong sunshine, putting it among the best affordable phones, and Nothing OS has some of the best design consistency of any Android UI.
• The 4,500-nit HDR peak was only validated with specific HDR test files, not actual video playback — real-world output is around 700 nits in SDR and 1,550–1,600 in HDR.
• The '5,000-nit peak brightness' spec means nothing in practice — a marketing figure pulled from a single-pixel measurement.
• 144Hz refresh (vs 120Hz on the regular 4a) and 1,600 nits white brightness / 5,000 nits peak, marketed as 66% brighter than the Phone (3a) series — though there's no extra output on a small 10% window.
• High-frequency PWM dimming makes it better suited to users sensitive to screen flicker, although slight flickering is still present.

Xiaomi 15

A small but flagship-grade flat AMOLED with class-leading peak brightness. Outdoor visibility is a recurring highlight.

• An independent test clocked the display at 3,175 nits at 20% APL — bright enough to comfortably read in direct sun.
• The phone offers 3,200 nits of peak brightness; a year on, the screen still feels flagship-level for YouTube, Netflix and gaming.
• There is a dedicated sunlight mode you toggle in settings that boosts the panel up to 3,200 nits.
• Whether watching video or gaming, after a year the display still feels flagship level.

Nothing Phone (4a) Pro

The headline value play: a 50MP Sony LYT-710 main with OIS, a true 50MP 3.5x periscope telephoto (80mm) with OIS, and an 8MP ultrawide — flagship-tier hardware Samsung and Apple don't put in phones at this price. Output is characterful and the telephoto is a genuine win, but reviewers consistently flag inconsistency, average low-light and a gimmicky 140x digital zoom.

• Triple rear system: 50MP Sony LYT-710 main (f/1.9, OIS), 8MP ultrawide, and a 50MP periscope telephoto with 3.5x optical zoom (80mm, f/2.9, OIS).
• Both the main and periscope-zoom cameras are 50MP and deliver strong results for this price range; the zoom in particular stands out from competitors and even allows for extreme digital zoom.
• Having a proper dedicated telephoto shooter is a genuine love, although the camera experience itself is a little bit inconsistent at times.
• It's not clinically the best camera, but the shots have a bit more soul to them.
• Low-light performance isn't the best, and image quality when you zoom right in isn't the best out there — not bad, just not class-leading.
• The 140x zoom headline grabs attention, but in use it's more about how far the camera can push digitally than something you'd rely on day-to-day.
• Not super impressed by the camera or the giant protruding bumps the lenses sit in.

Xiaomi 15

A Leica-tuned triple 50MP system that reviewers rate among the best you can get in a compact phone, with a large 1/1.3-inch main sensor and a versatile 60mm telephoto. Pro-grade video is strong via the main sensor.

• This is one of the best and most capable camera setups you can currently get in a relatively compact phone.
• Xiaomi swapped the Xiaomi 14 sensor for a new JN5 telephoto with a 60mm focal length, paired with a large 1/1.3-inch main sensor.
• The telephoto offers 2x optical zoom (46mm) but you can still push to ~6x with an impressive level of detail — a strong pick for buyers who don't need extreme reach.
• Portrait shots were compared directly against a Sony a6100 with a 23mm f/1.4 lens (≈35mm equivalent, ~f/2.1 depth of field) and held up well.
• The main camera can shoot 8K30 from the main sensor, and that 8K footage is roughly 50% more detailed than 4K30.

Nothing Phone (4a) Pro

The Snapdragon 7 Gen 4 with UFS 3.1 storage is a clear, tangible step up from the Phone (3a) generation — Nothing claims +27% CPU, +30% GPU and +65% AI. It's a perfectly capable everyday chip that feels noticeably quicker, but it's explicitly not a gaming powerhouse and warms up under sustained heavy load.

• Backed by OS optimisations and a custom CPU scheduler, the chipset delivers 27% better CPU, 30% better GPU and 65% better AI performance than the Nothing Phone (3a); storage is 147% faster in reads and 380% faster in writes.
• Snapdragon 7 Gen 4 is a perfectly acceptable chip across the board, and the upgrade to UFS 3.1 makes this feel noticeably quicker compared to the Nothing Phone (3a) and prior.
• The CPU performance difference between the 4a Pro and the vanilla 4a is not massive, but it is still very much notable.
• Available in 8GB+128GB, 8GB+256GB and 12GB+256GB configurations, all running near-stock AOSP-style Nothing OS.
• Like most phones in this segment, it shows some basic heat build-up during really extensive tasks like gaming or 4K editing in high-end software, though it stays responsive while gaming.
• It's by no means a top-notch gaming phone, although the processor is better than the regular 4a's and squeezes out a bit more performance and FPS.

Xiaomi 15

Snapdragon 8 Elite makes it one of the fastest small phones available, and it holds sustained performance better than larger rivals — but it still runs warm under prolonged synthetic and 4K-video loads.

• It runs the Snapdragon 8 Elite — pretty much the fastest chipset available on any smartphone at launch.
• In a stress test against the Galaxy S25 and Oppo Find X8, the Xiaomi 15 won on stability (~72%) versus the S25's 67% and the Find X8's 58.6%, and also had the upper hand in Geekbench.
• Despite being a much smaller phone tested in hotter conditions, it sustained better performance and smoothness than an iQOO 13 in a 10-loop benchmark; an external cooler lifted the lowest-loop score 14%.
• The chipset swap to the Snapdragon 8 Elite is welcome, but just like last year the Xiaomi 15 still struggles to keep it cool under prolonged loads.
• A year on the flagship chipset is still very powerful and the phone's performance remains solid in 2026.

Nothing Phone (4a) Pro

The ~5,080mAh cell reliably gets through a day and endurance improved across all of GSMArena's tests versus the 3a Pro — but it's only an 80mAh bump over last year and looks small next to 6,000–7,000mAh budget rivals. 50W wired charging is the trade-off win; there is no wireless charging at all.

• Endurance has improved across the board in all tests compared to last year's Nothing Phone (3a) Pro; with a 68W USB-PD charger the phone peaked at around 42W.
• The review unit gets through a day without problems, but it'll certainly be into the red and close to done after about 15 hours of use; the OnePlus 15R has a much meatier battery to last longer.
• It's only an 80mAh increase over last year — small fry next to budget rivals like the Poco M8 Pro, which uses silicon-carbon tech to reach 6,500mAh.
• 50W wired charging is very respectable at this price — besting anything Google, Apple or Samsung offers below £500.
• Because the processor isn't power-hungry and the battery is large for the chip, real-world battery life is excellent.
• Roughly 13 hours of continuous playback at maximum brightness in a streaming test — impressive for what Nothing is doing at this price.

Xiaomi 15

A ~5,240mAh cell that beats a Galaxy S25 in head-to-head rundowns and recharges very fast over both wire and wireless — though a HyperOS idle drain divides reviewers.

• The Xiaomi 15 packs a larger ~5,240mAh battery versus a Galaxy S25's ~4,000mAh while only being 27g heavier, and ended a head-to-head rundown at 30% vs the S25's 13%.
• It charges in around 45 minutes with the 90W adapter in the box, and the reviewer had zero issues with battery life in normal mixed use.
• From a fully dead battery a measured charge test reached 66% in 45 minutes, 91% at 1h05m and a full 100% in about 1h15m.
• It also supports 50W wireless charging — faster than typical flagship wired speeds — though there are no Qi magnets built in, so you need a 50W-compatible mat for top speed.
• Xiaomi says battery can run roughly 25% longer than the Xiaomi 14.

Nothing Phone (4a) Pro

Nothing OS 4.1 on Android 16 is the universal favourite: near-stock AOSP functionality with a distinctive monochrome visual identity, almost no bloatware, and AI that's present but not forced. The one hard reservation is update length — only 3 years of OS upgrades against 6 years of security patches.

• Nothing OS sticks close to a clean, near-stock Android (AOSP) experience in functionality, but stands out with its distinctive visual identity.
• After a week the phone is 'absolutely brilliant'; software is where Nothing phones shine, even if the camera 'window' at the top of the display is basically a pseudo-iPhone look.
• Software is where Nothing phones absolutely shine — the clearest reason to pick this over rivals.
• There's a smattering of AI here, but it's not shoved down your throat — and the software is basically the same clean setup as the regular Nothing Phone (4a).
• Unlike Samsung's Galaxy AI which is in your face from day one, Nothing's AI stays out of the way — an impressive, restrained package overall.
• Nothing's take on Android 16 has some of the best design consistency you'll find on any Android UI, Google included.

Xiaomi 15

HyperOS is fast and feature-rich (IR blaster, long update commitment) but the bloat, ads and unremovable apps remain the phone's most consistent complaint, and big updates have shifted benchmark behaviour.

• Xiaomi committed to roughly 4 years of major Android OS updates and 5 years of security patches.
• Owners dislike that certain pre-installed apps can't be uninstalled and that HyperOS surfaces ads and unsolicited notifications even on a flagship.
• The HyperOS 3 (Android 16) update is described as one of the riskiest software moves Xiaomi has made; everything still feels like butter day-to-day but Geekbench scores have declined with every major HyperOS update.
• After the Android 16 / HyperOS 3 update many owners report better battery life, and the IR blaster remains a favourite Xiaomi touch.
• A year on the software support has kept the phone feeling fresh and reliable, with a smooth overall experience.

Nothing Phone (4a) Pro

At $499 it directly undercuts the experience-per-dollar of the same-priced Pixel 10a and iPhone 17e, and several reviewers would take it over the 10a without hesitation. The closest internal threat is its own cheaper sibling, the standard Phone (4a), which shares the same cameras for $150 less.

• From the design to the software and cameras, this is a phone that should absolutely not be slept on — at the price of a Pixel 10a, 'I'd take this 10 out of 10 times over a 10a.'
• Vibes and great value for under $500 — a balanced all-rounder.
• Against its immediate rivals the Pixel 10a and iPhone 17e it looks impressive: a larger, brighter, faster display, more cameras, and Nothing's unique design including the Glyph Matrix.
• A premium balanced package with polished software and really good cameras — recommended, even if it's not perfect on the IP rating or front-camera 4K.
• The biggest problem for the 4a Pro is its own little brother — the standard 4a costs much less and gets the exact same cameras.
• While the (4a)'s design is still the best in the Nothing range, the (4a) Pro is a close second, and its speakers sound better than the standard model's.

Xiaomi 15

Widely called the best compact flagship of 2025, but it's priced like a flagship and only an iterative bump over the Xiaomi 14 — and in the US a Galaxy S25 or iPhone 16 is cheaper and easier to buy.

• One of the best compact flagships on the market, if not the best one — reviewers were left quite impressed.
• Pitched directly as 'The Best Compact Flagship of 2025?' in a benchmarks-and-blind-camera comparison against the iPhone 16 Pro Max and Galaxy S25 Ultra.
• A compact flagship with excellent battery life, though it shares near-identical design, display and cameras with its predecessor — it can feel like a fairly minor update.
• A new Xiaomi 15 (12GB/256GB) retails around €999 globally; used prices have dipped to €700-800 on eBay/Swappa — a solid 20-30% drop that makes the used market tempting.
• Compared with a Galaxy S25 or iPhone 16 — both cheaper and easier to buy in the US — the Xiaomi 15's price feels premium for what is essentially an iterative upgrade over the Xiaomi 14.