Realme P3 Ultra 5G VS Vivo Y400 5G

Both the Realme P3 Ultra 5G and the Vivo Y400 5G share the same IP68 waterproof rating, meaning both can withstand submersion in water under standardized conditions. Neither adopts a rugged build or a foldable form factor, placing them squarely in the conventional smartphone category. For everyday users, the shared IP68 certification is a meaningful assurance against accidental spills, rain, or brief submersion — and neither phone holds an edge here.

Where the two diverge is in physical dimensions. The Realme P3 Ultra is noticeably slimmer at 7.4 mm versus the Vivo Y400's 7.9 mm, and lighter at 183 g compared to 197 g. While a 0.5 mm thickness difference may seem marginal on paper, the combined effect with the 14 g weight gap is perceptible during prolonged one-handed use or when pocketed — the P3 Ultra will simply feel less bulky day-to-day.

On design, the Realme P3 Ultra 5G holds a clear advantage. It is meaningfully thinner and lighter without sacrificing the same waterproofing level, making it the more refined and comfortable form factor of the two.

At the panel level, both phones are evenly matched — identical 6.67″ OLED/AMOLED screens with a smooth 120Hz refresh rate. AMOLED delivers punchy colors and true blacks on both, and the shared refresh rate means equally fluid scrolling and animations. The meaningful split comes down to resolution and pixel density: the Realme P3 Ultra renders at 1220 x 2712 px and 446 ppi, versus the Vivo Y400's 1080 x 2400 px at 395 ppi. That 51 ppi gap is genuinely visible — text appears crisper and fine detail in photos or UI elements is noticeably sharper on the P3 Ultra, particularly at close reading distances.

The Vivo Y400 counters with two software-level display features the P3 Ultra lacks. Its HDR10 support means compatible streaming content — Netflix, YouTube — is rendered with a wider dynamic range and more accurate highlights. Its Always-On Display also lets users check time and notifications without waking the full screen, a small but genuinely convenient daily-use feature. The P3 Ultra offers neither.

The verdict depends on priorities. For raw visual fidelity and sharpness, the Realme P3 Ultra 5G holds the edge. But if media consumption and ambient display utility matter, the Vivo Y400 5G partially closes the gap. On balance, the P3 Ultra's sharper panel is the more impactful hardware advantage for most users.

The chipset gap here is substantial. The Realme P3 Ultra runs on the MediaTek Dimensity 8350, a genuine upper-mid-range SoC with a peak CPU core clocked at 3.35 GHz, while the Vivo Y400 relies on the Snapdragon 4 Gen 2 — an entry-to-mid-range chip whose fastest cores top out at 2.3 GHz. In practice, this translates to a meaningful difference in sustained performance: the P3 Ultra handles demanding apps, multitasking, and gaming with considerably more headroom, while the Y400 is tuned for everyday efficiency rather than peak throughput.

The GPU story reinforces this gap. The P3 Ultra's Mali G615 MC6 runs at 1400 MHz, compared to the Y400's Adreno 613 at 955 MHz. For graphically intensive games or GPU-accelerated tasks, the P3 Ultra's advantage is clear. RAM further widens the divide — 12 GB at a rapid 8533 MHz on the P3 Ultra versus 8 GB at 3200 MHz on the Y400. Faster RAM directly improves how quickly data is fed to the CPU and GPU, making the P3 Ultra's real-world responsiveness even snappier than the raw clock speed difference alone would suggest. The P3 Ultra also supports up to 24 GB maximum memory, versus 16 GB on the Y400, giving it more longevity as software demands grow.

The Realme P3 Ultra 5G holds a commanding advantage in this category across every meaningful performance dimension — chipset class, CPU speed, GPU performance, and memory bandwidth. The Vivo Y400 5G is adequate for light to moderate use, but it cannot match the P3 Ultra for users who demand sustained, high-performance operation.

The rear camera systems start from the same 50 MP main sensor, but diverge sharply in two critical areas. The Realme P3 Ultra includes optical image stabilization (OIS) — the Vivo Y400 does not. OIS physically compensates for hand tremor during shooting, making a tangible difference in low-light photo sharpness and video smoothness. Paired with that, the P3 Ultra records video at up to 4K 60fps, while the Y400 is capped at 1080p 30fps. That is not a minor step-down — it represents two full tiers of video quality, meaning the Y400 simply cannot produce the same level of motion detail or resolution in video, regardless of lighting conditions.

Selfie shooters will find the picture more mixed. The Vivo Y400 front camera comes in at 32 MP versus the P3 Ultra's 16 MP, offering roughly twice the pixel count for portraits and video calls. The P3 Ultra does edge it out slightly with a marginally wider f/2.4 aperture compared to the Y400's f/2.5, which allows fractionally more light — but the resolution gap is the more meaningful differentiator for selfie quality.

Overall, the Realme P3 Ultra 5G is the stronger camera system. Its OIS and 4K 60fps video capability represent hardware advantages that cannot be replicated in software, and they matter for anyone who shoots video regularly or in challenging light. The Vivo Y400 5G earns a partial concession on selfies with its higher-resolution front camera, but that alone is not enough to offset the P3 Ultra's rear camera advantages.

Rarely does a spec group produce a result this definitive: the Realme P3 Ultra 5G and Vivo Y400 5G are in complete lockstep across every single operating system specification provided. Both ship with Android 15, and every feature — from privacy controls like location and camera/microphone permissions, to usability tools like split-screen, Picture-in-Picture, dynamic theming, and offline voice recognition — is present on both devices without exception.

The privacy feature set shared by both is notably comprehensive for Android phones in this segment: app tracking blocking, clipboard warnings, and granular notification permissions are all included. Neither phone gets direct OS updates, and neither supports Wi-Fi password sharing or focus modes — limitations that apply equally to both.

This category is a definitive tie. Choosing between these two phones based on software experience alone is not possible — they offer an identical feature set at launch. Any real-world differences in the OS experience would stem from each brand's custom Android skin rather than the underlying platform capabilities reflected in these specs.

A 6000 mAh battery on both phones sets a strong baseline — capacity at this level comfortably supports heavy users through a full day and lighter users well into a second. Neither phone offers wireless charging or a removable battery, so the two are structurally identical in how power is delivered and managed.

The only differentiator is charging speed: the Vivo Y400 5G edges ahead at 90W versus the Realme P3 Ultra's 80W. That 10W gap, while not dramatic, does translate to a marginally shorter time to reach a full charge — particularly noticeable when topping up quickly before heading out. In practical terms, the difference amounts to a few minutes at most during a full charge cycle, making it a real but modest advantage.

This category is essentially a near-tie, with a slight edge to the Vivo Y400 5G on charging speed alone. For users who prioritize battery longevity over the day, both phones perform identically. Only those who frequently fast-charge from low levels will notice the Y400's marginal lead.

The audio specs for these two phones are identical across every available data point. Both feature stereo speakers and both drop the 3.5mm headphone jack — a now-common trade-off in this segment that pushes users toward Bluetooth or USB-C audio. Neither supports LDAC or aptX Lossless, meaning high-resolution wireless audio codecs are off the table for both, and neither includes an FM radio.

This is a straightforward tie. There is no differentiator between the Realme P3 Ultra 5G and the Vivo Y400 5G based on the provided audio specifications — users can expect a comparable out-of-box audio experience from both devices.

For most of the connectivity checklist, these two phones are in lockstep — both support 5G, dual SIM, NFC, USB Type-C, GPS with Galileo, and carry an identical sensor suite including gyroscope, accelerometer, and compass. NFC in particular is worth noting as a shared strength, enabling contactless payments and quick device pairing for users in supported markets.

The meaningful separators are Wi-Fi and Bluetooth. The Realme P3 Ultra 5G supports Wi-Fi 6 (802.11ax), while the Vivo Y400 tops out at Wi-Fi 5 (802.11ac). Wi-Fi 6 delivers higher throughput, lower latency, and better performance in congested network environments — a tangible advantage in busy households or offices with many connected devices. On Bluetooth, the P3 Ultra's version 5.4 is a step ahead of the Y400's version 5.0, offering improved connection stability, slightly better range, and more efficient power consumption for wireless peripherals and audio devices.

The Realme P3 Ultra 5G holds a clear edge in this category. Neither upgrade is transformative in isolation, but together — a newer Wi-Fi standard and a more current Bluetooth version — they represent a meaningfully more future-ready connectivity package than the Vivo Y400 5G offers.

This spec group is slim on data points, but it does surface one distinguishing feature. Both phones share a video light and neither adopts sapphire glass or an e-paper display — those shared absences carry no practical consequence at this price tier. The sole differentiator is that the Vivo Y400 5G features a curved display, while the Realme P3 Ultra 5G has a flat screen.

A curved display is largely an aesthetic and ergonomic choice: it can lend a more premium feel in hand and softens the visual edges of the device. The trade-off is that flat screens are generally easier to use with screen protectors and may be less prone to accidental edge touches. Whether the curve reads as an advantage or a drawback depends entirely on personal preference — it is a styling distinction rather than a functional one.

Based strictly on these specs, this category is a marginal edge to the Vivo Y400 5G for users who prefer the curved-screen aesthetic, and a non-issue for everyone else. Neither phone holds a meaningful functional advantage here.