Oppo F31 Pro 5G VS Realme 15 5G

Both phones are waterproof and neither offers a rugged or foldable build, so the most meaningful design differentiator here is water resistance. The Realme 15 5G holds an IP69 rating against the Oppo F31 Pro 5G's IP68. In practice, IP68 already covers prolonged submersion in normal conditions, but IP69 adds resistance to high-pressure, high-temperature water jets — a meaningful step up if the device is ever exposed to forceful water streams, such as rinsing under a tap or in rain-heavy environments. Reinforcing this, the Realme also carries a deeper submersion rating of 2 m versus 1.5 m, giving it a broader safety margin during accidental drops in water.

On physical form, the differences are subtle but real. The Realme 15 5G is marginally slimmer at 7.66 mm compared to the Oppo's 8 mm, and slightly lighter at 187 g versus 190 g. Neither gap is dramatic enough to change how the phone feels day-to-day, but the Realme does edge out a more refined profile. The Oppo is a touch more compact in height and width, which some users may prefer for one-handed use, though their total volumes are nearly identical.

Overall, the Realme 15 5G holds a clear design advantage in this group, driven primarily by its superior IP69 waterproofing and greater submersion depth. The slimmer chassis is a minor bonus. The Oppo F31 Pro 5G's IP68 protection is still very capable for everyday use, but users who prioritize water resilience — or simply want a higher-rated device — will find the Realme the stronger choice here.

Both phones use OLED/AMOLED panels with identical touch sampling rates and damage-resistant glass, so the comparison quickly shifts to where the Realme 15 5G pulls decisively ahead. Its 6.8″ screen versus the Oppo F31 Pro 5G's 6.57″ is noticeable in daily use — more content fits on screen when browsing or streaming, and media feels more immersive. More significantly, the Realme's 1280 x 2800 px resolution translates to a pixel density of 453 ppi, compared to the Oppo's 397 ppi at 1080 x 2372 px. That 56 ppi gap is perceptible: text renders sharper, fine UI details are crisper, and high-resolution images look noticeably cleaner on the Realme.

The brightness gap is arguably the most impactful differentiator in real-world use. The Realme 15 5G peaks at 1800 nits typical brightness, three times the Oppo's 600 nits. In outdoor environments — direct sunlight, bright reflections — the Oppo will struggle with legibility in situations where the Realme remains comfortably readable. For users who frequently use their phone outdoors, this difference is substantial. The Realme also steps up the refresh rate to 144Hz versus the Oppo's 120Hz, which delivers marginally smoother scrolling and animation, though the practical difference between these two rates is less dramatic than the jump from 60Hz to 120Hz.

Neither device supports HDR10, HDR10+, or Dolby Vision, so neither has an edge in HDR content rendering. Still, taken as a whole, the Realme 15 5G holds a commanding display advantage — sharper resolution, significantly higher brightness, and a faster refresh rate make it the stronger choice for anyone who prioritizes screen quality.

Rarely does a performance comparison come down to a single differentiator, but here it does. Both phones run on the identical MediaTek Dimensity 7300 chipset — same 4 nm process, same 8-core CPU configuration, same Mali G615 MC2 GPU, same 12 GB of DDR5 RAM at 6400 MHz. Unsurprisingly, their benchmark scores are exactly equal: 1026 single-core and 2932 multi-core on Geekbench 6. In practice, users of either phone will experience identical app launch speeds, multitasking behavior, and gaming performance.

The only meaningful separation in this group is storage: the Oppo F31 Pro 5G ships with 256 GB while the Realme 15 5G doubles that to 512 GB. For users who store large media libraries, download games, or record video heavily, this difference has tangible day-to-day relevance — running out of space forces compromises that no amount of processing power can compensate for. Both devices share the same 16 GB maximum memory ceiling, so RAM expandability is not a differentiator either.

On raw performance, this is a dead heat. The Realme 15 5G earns a functional edge in this group solely through its larger base storage, which gives it more headroom out of the box without requiring cloud offloading or file management workarounds.

The primary cameras are evenly matched at 50 MP with OIS on both phones, and video maxes out at 4K at 30fps for each. The feature sets for manual controls — ISO, focus, white balance, exposure — are also identical, so neither has a workflow advantage for enthusiast shooting. Where things diverge is in the supporting hardware. The Realme 15 5G's secondary camera steps up to 8 MP versus the Oppo F31 Pro 5G's 2 MP, a gap that matters in practice: a 2 MP secondary lens is effectively limited to depth-sensing duties, while 8 MP can deliver usable ultra-wide or macro shots with real detail. The Realme also benefits from a BSI sensor — a back-illuminated design that captures more light per pixel — which the Oppo lacks, giving the Realme a structural low-light advantage even at the same resolution.

The selfie camera tells a similar story. The Realme packs a 50 MP front shooter against the Oppo's 32 MP, a meaningful gap for users who prioritize portrait or video calling quality. Flash hardware also favors the Realme: it includes a dual-tone, dual-LED flash that produces more natural-looking artificial light by blending warm and cool tones, while the Oppo uses a single LED. For low-light flash photography, this difference is visible in skin tones and color accuracy.

Taken together, the Realme 15 5G holds a clear camera advantage across multiple dimensions — a more capable secondary lens, a higher-resolution front camera, a BSI sensor for better light sensitivity, and superior flash hardware — while matching the Oppo everywhere else. Users for whom camera quality is a priority will find the Realme the more versatile imaging device.

This is the rare category where the comparison is entirely straightforward: every single specification in this group is identical between the two phones. Both run Android 15, both lack direct OS updates, and both share the same privacy toolkit — location controls, camera and microphone permissions, app tracking blockers, and clipboard warnings. Neither supports cross-site tracking protection or Mail Privacy Protection, so users sensitive to those specific privacy gaps will face the same limitations on either device.

The feature parity extends to usability and productivity tools as well. Split-screen multitasking, picture-in-picture, dynamic theming, on-device machine learning, offline voice recognition, and full-page screenshots are all present on both. Neither phone can be used as a PC substitute, and neither offers Quick Start or Focus Modes. In short, a user switching from one device to the other would find the software environment essentially indistinguishable.

This group is a complete tie. With no differentiating data point anywhere in the spec set, the operating system experience offers no basis for choosing one phone over the other — the decision should rest entirely on the differences found in other spec groups.

Much like the operating system group, battery hardware offers no grounds for differentiation here. Both the Oppo F31 Pro 5G and the Realme 15 5G carry an identical 7000 mAh cell — a generously large capacity that sits well above the mainstream smartphone average and points toward strong multi-day endurance under moderate use. Both support 80W fast charging, which at that wattage can realistically bring a large battery from near-empty to a usable level in well under an hour. Both ship with a charger in the box, which remains a notable inclusion as the industry has moved away from bundling them.

Neither phone offers wireless charging or reverse wireless charging, so users who have invested in a wireless charging ecosystem will find no advantage on either side. Batteries are non-removable on both, which is now standard practice for sealed, water-resistant designs — consistent with the IP ratings established in the design group.

This group is a complete tie. Every battery specification is identical across both devices, and no meaningful distinction can be drawn here. Users prioritizing battery life or charging convenience will be equally served — or equally constrained — by either phone.

After several groups of near-identical specs, audio is where the Oppo F31 Pro 5G earns a clear and significant advantage. Both phones drop the 3.5mm headphone jack and feature stereo speakers, but their wireless audio codec support diverges sharply. The Oppo carries aptX, aptX HD, and LDAC — three high-quality Bluetooth audio codecs — while the Realme 15 5G supports none of them, defaulting to standard SBC or AAC transmission.

This distinction matters considerably for users with quality wireless headphones. LDAC, developed by Sony, transmits up to three times more data than standard Bluetooth audio, making it the preferred codec for hi-res audio playback over Bluetooth. aptX HD similarly enables 24-bit audio over wireless connections. Without these codecs, the Realme is limited to compressed audio streams regardless of how capable the headphones on the other end are — the bottleneck is in the phone itself. For casual listeners using budget earbuds, the gap is negligible, but for anyone with premium wireless headphones, it is a meaningful limitation.

The Oppo F31 Pro 5G wins this group outright. Its codec support stack gives it a genuine high-fidelity wireless audio capability that the Realme simply cannot match, making it the more compelling choice for audio-conscious users.

The connectivity foundations are identical: both phones offer 5G, Wi-Fi 6, Bluetooth 5.4, dual SIM, USB Type-C, and matching download and upload speeds of 3270 Mbits/s. Neither supports external storage, and both are limited to USB 2.0 — a modest interface speed that is the norm at this tier but worth noting for anyone who transfers large files via cable regularly. Sensor coverage is also largely shared, including GPS, Galileo, gyroscope, accelerometer, and compass.

The two meaningful differentiators both favor the Oppo F31 Pro 5G. It includes NFC, which the Realme 15 5G omits — a practical gap for users who rely on contactless payments, transit cards, or quick device pairing. NFC has become a near-essential feature in daily urban use, and its absence on the Realme is a tangible limitation. The Oppo also carries an infrared sensor, allowing it to function as a universal remote for televisions and home appliances — a niche but genuinely useful convenience that the Realme lacks entirely.

The Oppo F31 Pro 5G takes this group by virtue of two features the Realme does not offer. NFC in particular is the more impactful omission, as it affects everyday transactions and workflows rather than occasional use cases. Users who depend on mobile payments or smart device interaction will find the Oppo the more capable option here.

The miscellaneous group covers a small set of display and hardware characteristics, and every spec here is shared equally between the two phones. Both include a video light, neither uses sapphire glass, and neither features a curved or e-paper display. There is simply nothing in this data set that separates one device from the other.

This group is a complete tie. With only four data points and zero differentiation across them, it contributes no new information to the overall comparison. Any purchasing decision should be based on the distinctions surfaced in other spec groups.