Realme 15x 5G (India) VS Realme P3 Ultra 5G

The most immediately noticeable difference in this group is form factor. The Realme P3 Ultra 5G is meaningfully slimmer at 7.4 mm and lighter at 183 g, compared to the Realme 15x 5G's 8.3 mm thickness and 212 g weight. A 29-gram gap is not trivial in daily use — it translates to a phone that feels noticeably less fatiguing during extended one-handed use or long calls. The thinner profile also contributes to a more premium in-hand feel and makes it easier to pocket.

The water protection story is more nuanced. The 15x carries an IP69 rating, which is certified against high-pressure, high-temperature water jets — a spec more commonly seen in industrial or rugged devices. The P3 Ultra holds an IP68 rating, which certifies it for sustained submersion in water (typically up to 1.5 m). For everyday real-world scenarios — rain, splashes, or accidental drops near water — IP68 is the more practically relevant standard. Despite this, the 15x is labeled only ″water resistant″ while the P3 Ultra is described as ″waterproof,″ which aligns with IP68's submersion capability being the more consumer-meaningful benchmark.

Overall, the P3 Ultra 5G holds a clear design edge: it is lighter, slimmer, and offers the more practically useful water protection standard for typical consumers. The 15x's IP69 rating is a specialised credential that adds little advantage in everyday scenarios, and it cannot offset the ergonomic disadvantage of its extra bulk. Neither device offers a rugged build or a foldable form factor, so those are non-factors in this comparison.

The panel technology gap here is significant. The Realme P3 Ultra 5G uses an OLED/AMOLED display, which delivers true blacks, richer contrast, and more vibrant colors by lighting pixels individually. The Realme 15x 5G relies on an LCD IPS panel — a competent but fundamentally less capable technology that uses a backlight, resulting in less contrast and washed-out blacks by comparison. For media consumption, gaming, or anything visually intensive, the OLED panel makes a tangible, visible difference in everyday use.

Resolution sharpens that divide further. The P3 Ultra's 1220 x 2712 px resolution yields a pixel density of 446 ppi, producing genuinely crisp, detail-rich imagery. The 15x, despite its slightly larger 6.81″ screen, only resolves at 720 x 1570 px — a pixel density of 395 ppi — which is a notable step down and one that becomes apparent when reading fine text or viewing high-resolution content. The 15x's higher 144Hz refresh rate marginally edges the P3 Ultra's 120Hz, but this advantage is narrow and heavily undermined by the underlying panel quality gap.

The P3 Ultra 5G wins this category decisively. A sharper, higher-resolution OLED screen fundamentally outclasses an HD+ LCD regardless of the 15x's refresh rate lead. Users who prioritize display quality for streaming, browsing, or gaming will find the P3 Ultra the far more capable device here. Both phones share the same limitations — no HDR support, no Always-On Display, no damage-resistant glass branding — so those factors do not differentiate them.

These two phones are not in the same performance league. The Realme P3 Ultra 5G is powered by the MediaTek Dimensity 8350, a flagship-tier chip built on a 4 nm process, while the Realme 15x 5G runs on the MediaTek Dimensity 6300, a mid-range 6 nm chip. That generational and architectural gap is reflected starkly in the benchmark scores: the P3 Ultra posts an AnTuTu score of approximately 1,450,000 versus the 15x's 429,351 — more than three times higher. The Geekbench 6 multi-core result tells the same story, with the P3 Ultra at 4700 compared to the 15x's 2012. In practice, this means noticeably faster app launches, smoother multitasking, and far greater headroom for demanding games or sustained workloads on the P3 Ultra.

The memory architecture compounds this gap. The P3 Ultra uses LPDDR5 RAM running at 8533 MHz with a maximum memory bandwidth of 68.2 GB/s, versus the 15x's LPDDR4 at 2133 MHz and just 17.07 GB/s of bandwidth. Faster memory directly reduces bottlenecks in data-intensive tasks — gaming, video editing, and heavy multitasking all benefit. The P3 Ultra also ships with 12 GB of RAM standard versus the 15x's 8 GB, giving it more breathing room for running multiple apps simultaneously. The GPU gap mirrors this: the P3 Ultra's Mali G615 MC6 clocked at 1400 MHz significantly outpaces the 15x's Mali-G57 MC2 at 950 MHz, translating to smoother frame rates in graphically demanding titles.

The P3 Ultra 5G wins this category without contest. Across every meaningful performance metric — CPU throughput, GPU power, memory speed, and bandwidth — it outclasses the 15x by a wide margin. Both offer 256 GB of storage, so that is a wash, but for users who care about sustained performance, gaming capability, or future-proofing, the P3 Ultra is in an entirely different class.

Despite sharing a 50 MP main sensor resolution, the rear camera systems here diverge in meaningful ways. The Realme P3 Ultra 5G brings a multi-lens rear setup and, critically, optical image stabilization (OIS) — a hardware feature that physically compensates for hand shake during photos and video. The Realme 15x 5G has neither a secondary lens nor OIS, which limits its versatility and low-light steadiness compared to the P3 Ultra. The video recording gap is equally stark: the P3 Ultra captures up to 4K at 60 fps, while the 15x tops out at 1080p at 30 fps — a full two tiers lower, making it a noticeably weaker choice for anyone who shoots video regularly.

The selfie camera flips the dynamic. The 15x carries a 50 MP front camera against the P3 Ultra's 16 MP — a significant resolution advantage that benefits users who prioritize high-detail selfies or use the front camera for video calls. One notable trade-off: the 15x supports RAW shooting on the main camera, giving photographers who post-process their images more editing latitude, whereas the P3 Ultra does not offer this. Both phones share a strong common feature set — phase-detection autofocus, continuous autofocus during recording, slow-motion, HDR mode, and a range of manual controls — so day-to-day usability is well-matched at a baseline level.

On balance, the P3 Ultra holds the edge for most users, primarily due to OIS, the multi-lens system, and dramatically superior video resolution. The 15x's higher-resolution selfie camera and RAW support are genuine advantages for specific use cases, but they are niche wins that do not outweigh the P3 Ultra's broader rear camera and video capabilities.

This is a rare category where the two devices are in complete lockstep. Both the Realme 15x 5G (India) and the Realme P3 Ultra 5G ship with Android 15 and share an identical feature set across every single data point in this group — privacy controls, productivity tools, customization options, and system capabilities are all matched one-for-one.

The shared feature set is meaningfully modern: both offer on-device machine learning, dynamic theming, split-screen multitasking, Picture-in-Picture, offline voice recognition, and a solid suite of privacy tools including camera and microphone access controls and app tracking blocking. Notable shared limitations include the absence of direct OS updates — meaning both rely on Realme's own update pipeline rather than receiving Android updates straight from Google — and neither supports Wi-Fi password sharing or focus modes.

This category is a complete tie. There is no differentiator here that should influence a purchase decision between these two phones. Users can expect an identical software experience on either device based strictly on the provided specifications.

Battery capacity is where the Realme 15x 5G (India) reclaims its first clear win in this comparison. Its 7000 mAh cell is a genuinely large battery — 1000 mAh more than the P3 Ultra's 6000 mAh. That gap is meaningful in real-world usage: all else being equal, a larger battery translates directly to more screen-on time and longer intervals between charges. For heavy users or those frequently away from a power source, the 15x's capacity advantage is a practical benefit that is hard to dismiss.

Charging speed partially offsets this. The Realme P3 Ultra 5G supports 80W fast charging versus the 15x's 60W, meaning the P3 Ultra can replenish its battery faster when plugged in. In practice, the faster charging speed helps compensate for the smaller cell — a user who charges in short bursts throughout the day may barely notice the capacity difference. Neither phone supports wireless charging, so that feature is off the table for both.

Declaring a winner here depends on usage pattern, but on raw specs the 15x holds the edge for battery endurance — its 7000 mAh capacity is the defining figure in this category. The P3 Ultra's faster charging is a useful counterpoint but does not fully neutralize a 1000 mAh deficit, particularly for users who prioritize going longer between charges over topping up quickly.

Audio is a compact category with one differentiator that matters. The Realme P3 Ultra 5G features stereo speakers, while the Realme 15x 5G (India) does not — meaning the 15x is limited to mono output. For media consumption — streaming video, gaming, or listening to music without headphones — stereo speakers create a noticeably wider, more immersive soundstage. A single mono speaker, by contrast, produces a flatter, more directional sound that feels comparatively thin when watching content or playing games.

Both phones drop the 3.5 mm headphone jack, so wired audio requires an adapter or USB-C headphones on either device. Neither supports high-fidelity wireless codecs like LDAC or aptX Lossless, which means premium Bluetooth headphone users won't extract lossless-quality audio from either phone. A built-in radio is also absent on both.

The P3 Ultra wins this category, and it isn't particularly close. Stereo speakers are the single most impactful audio hardware feature for everyday use without headphones, and the 15x's omission of them is a straightforward disadvantage for anyone who regularly consumes media on their device.

Wireless connectivity is one area where the two phones diverge in several practical ways. The Realme P3 Ultra 5G supports Wi-Fi 6 (802.11ax) in addition to Wi-Fi 4 and 5, while the Realme 15x 5G (India) tops out at Wi-Fi 5. Wi-Fi 6 delivers faster throughput, lower latency, and better performance in congested environments — particularly relevant in homes or offices with many connected devices. The P3 Ultra also has a marginally newer Bluetooth 5.4 versus the 15x's 5.3, a minor but forward-looking difference. More impactful is the presence of NFC on the P3 Ultra, which the 15x entirely lacks — NFC enables contactless payments, quick device pairing, and transit card functionality, making its absence on the 15x a tangible day-to-day limitation for users in NFC-friendly markets.

Storage expandability flips the advantage back to the 15x. It includes a microSD card slot, offering users a low-cost path to expanding storage beyond the base 256 GB. The P3 Ultra omits this entirely, making its onboard storage the hard ceiling. The 15x also includes a gyroscope gap — actually, it is the P3 Ultra that carries the gyroscope while the 15x does not, which matters for augmented reality applications and more precise motion-based gaming controls. Both phones share 5G support, dual SIM, USB Type-C at USB 2.0 speeds, GPS, and a fingerprint scanner.

Taken together, the P3 Ultra holds the connectivity edge. Wi-Fi 6, NFC, and a gyroscope represent three meaningful real-world advantages. The 15x's microSD slot is a legitimate counterpoint for users who need expandable storage, but it is a single practical win against a broader set of connectivity upgrades on the P3 Ultra.

The Miscellaneous category offers nothing to separate these two devices. The Realme 15x 5G (India) and the Realme P3 Ultra 5G match each other on every data point: both have a video light, and neither features sapphire glass, a curved display, or an e-paper display.

This is a complete tie. None of the specs in this group provide any basis for preferring one phone over the other, and users should look to the other specification categories to inform their decision.