Realme 15T 5G VS Vivo Y31 5G

Both the Realme 15T 5G and the Vivo Y31 5G carry an IP68 rating, meaning neither is a compromise on water protection — both can handle submersion. However, the Realme pushes further with a certified depth of 2.5 m, compared to the Vivo's 1.5 m. In practical terms, this means the Realme offers a meaningfully larger safety margin for accidental drops in water, whether in a pool, sink, or puddle.

Where the design gap becomes more tangible is in physical form. The Realme 15T is noticeably lighter at 181 g versus the Vivo Y31's 209 g — a 28 g difference that translates to a less fatiguing one-handed experience during extended use. It is also slimmer at 7.8 mm versus 8.4 mm, and smaller across every dimension, resulting in a volume of roughly 92.9 cm³ compared to the Vivo's 107.4 cm³. This makes the Realme noticeably more pocketable and easier to grip.

Neither phone features a rugged build or foldable form factor, so the comparison stays squarely on everyday ergonomics and water safety. The Realme 15T 5G holds a clear advantage in this group: it is lighter, slimmer, more compact, and offers deeper waterproofing — a well-rounded win for users who prioritize a refined, portable design.

The display is where these two phones diverge most sharply. The Realme 15T uses an OLED/AMOLED panel, while the Vivo Y31 relies on an LCD IPS screen — and that distinction carries real weight. OLED technology delivers true blacks, higher contrast, and more vibrant colors by lighting pixels individually, whereas LCD panels depend on a backlight that limits depth and punch. For media consumption, gaming, or simply reading text, the Realme's screen will look perceptibly richer.

Pixel density compounds this gap significantly. The Realme's 1080 x 2372 px resolution on a 6.57″ panel yields 401 ppi, while the Vivo's 720 x 1608 px resolution spread across a slightly larger 6.68″ screen results in just 264 ppi. At that density difference, text and fine detail on the Realme will appear noticeably crisper — 264 ppi sits at the lower end of acceptability for a modern smartphone. Both phones match on 120Hz refresh rate, so scrolling and animation smoothness are equal. The Realme also supports an Always-On Display, a convenience the Vivo lacks. The Vivo's one counter-point is its branded damage-resistant glass, which the Realme does not offer, providing some scratch and impact protection for the screen.

On balance, the Realme 15T 5G holds a commanding advantage in this category. Its OLED panel and substantially higher pixel density deliver a superior visual experience that the Vivo's HD+ LCD cannot match — the Vivo's screen protection is a useful practical perk, but it does not offset the gap in display quality.

The chipset matchup here is genuinely nuanced. The Vivo Y31 runs on a Snapdragon 4 Gen 2 built on a 4nm process, while the Realme 15T uses a Dimensity 6400 on a comparatively older 6nm node. A smaller fabrication process generally means better power efficiency and thermal performance — so the Vivo's chip is architecturally more modern in that respect. The Vivo also edges ahead on memory technology, using DDR5 RAM at 3200 MHz versus the Realme's DDR4 at 2133 MHz, which allows faster data throughput between memory and processor.

However, raw capacity tells a very different story. The Realme ships with 12GB of RAM and 256GB of storage — double the Vivo's 6GB RAM and 128GB. In day-to-day use, more RAM means more apps can stay active in the background without being reloaded, smoother multitasking, and more headroom for demanding tasks. The storage gap is equally consequential for users who keep large libraries of photos, videos, or apps. GPU clock speeds are essentially equal at roughly 950–955 MHz, so neither holds a meaningful graphics advantage.

This is a trade-off comparison rather than a clean sweep. The Vivo Y31 offers a more power-efficient, modern chip with faster memory bandwidth, while the Realme 15T 5G compensates with substantially greater RAM and storage capacity. For most users, the practical benefits of double the RAM and double the storage will be felt more consistently in real-world usage, giving the Realme a modest but meaningful overall edge in this category.

On the rear, both phones lead with a 50MP main sensor, but the Realme 15T adds a secondary 2MP lens, giving it a dual-camera setup the Vivo Y31 lacks. More notable is the aperture difference: the Vivo's sole rear lens opens to f/1.8, which is also the Realme's secondary lens aperture — the Realme's primary lens is actually narrower at f/2.4. A wider aperture lets in more light, so the Vivo may have a slight edge in low-light rear photography through its main lens. Neither phone offers optical image stabilization, which limits handheld video steadiness on both.

Video capability tips decisively in the Realme's favor. It captures footage at 1080p / 60fps, compared to the Vivo's 1080p / 30fps ceiling — 60fps produces noticeably smoother motion in fast-moving scenes and gives more flexibility when editing. The selfie camera gap is even more striking: the Realme packs a 50MP front sensor against the Vivo's 8MP, a difference that directly translates to sharper, more detailed self-portraits and higher-quality video calls.

The manual controls, autofocus systems, and shooting modes are largely identical across both devices, so the differentiators come down to three specific areas. The Vivo holds a narrow advantage in rear low-light aperture, but the Realme 15T 5G wins on frontal imaging and video recording capability by a clear margin — making it the stronger choice for users who prioritize selfies or smooth video capture.

Rarely does a spec group produce a result this definitive: every single data point across both phones is identical. Both the Realme 15T 5G and the Vivo Y31 5G run Android 15 and share an exact feature set — from privacy controls like location and camera/microphone permissions, to productivity tools like split-screen multitasking, Picture-in-Picture, and full-page screenshots.

The shared feature set is substantive and modern. Both include dynamic theming, on-device machine learning, offline voice recognition, and a battery health check — covering the bases that most users care about day-to-day. Privacy-conscious users will find the same toolkit on either device: app tracking blocks, clipboard warnings, and granular notification permissions are all present. Neither phone offers direct OS updates, Wi-Fi password sharing, focus modes, or Quick Start, so no gaps emerge on either side.

This category is an absolute tie. Choosing between these two phones on the basis of software features alone is impossible — the operating system experience, as defined by the provided specs, is functionally identical on both devices.

Both phones come equipped with generously sized batteries that sit well above the mainstream 5000 mAh standard — but the Realme 15T 5G pulls ahead with a 7000 mAh cell versus the Vivo Y31's 6500 mAh. That 500 mAh difference, while not dramatic in isolation, is meaningful at this capacity tier: it represents roughly an additional 30–45 minutes of screen-on time under typical usage, and for heavy users already pushing multi-day endurance, that margin could determine whether the phone lasts through a second day without a top-up.

Charging speed further consolidates the Realme's advantage. Its 60W fast charging outpaces the Vivo's 44W, which matters precisely because the Realme's larger battery would otherwise take longer to fill. In practice, the faster wattage helps offset the capacity difference at the wall — meaning the Realme charges its bigger battery in less time than the Vivo would need, despite having more energy to move. Neither device supports wireless or reverse wireless charging, so the comparison stays purely in the wired domain.

The Realme 15T 5G wins this category cleanly. It offers more battery capacity and faster wired charging simultaneously — two advantages that reinforce each other rather than cancel out, making it the stronger option for users who prioritize endurance and quick top-ups.

Audio is a lean category for both devices, but one difference stands out: the Vivo Y31 5G features stereo speakers, while the Realme 15T 5G does not. Stereo speakers produce sound from two separate points, creating a wider soundstage that makes media consumption — videos, music, gaming — noticeably more immersive compared to a mono setup. For a phone used frequently for hands-free audio, this is a tangible everyday advantage.

Everything else is level ground. Neither phone includes a 3.5mm headphone jack, so wired listening requires an adapter or a USB-C solution on both. Advanced Bluetooth audio codecs — aptX, LDAC, and their variants — are absent from both devices, meaning high-fidelity wireless audio transmission is not a differentiator here. Neither phone has a built-in radio either.

Given the limited spec set, the Vivo Y31 5G takes a narrow but real win in this category solely on the strength of its stereo speaker configuration — the only meaningful hardware distinction between the two phones in this group.

Wireless connectivity is largely matched between the two phones — both support 5G, dual SIM, Wi-Fi 5, expandable storage, and USB-C. Where they diverge is Bluetooth: the Realme 15T 5G uses Bluetooth 5.3 against the Vivo Y31's older Bluetooth 4.2. This is a significant generational gap — 5.3 offers improved connection stability, lower energy consumption, and better handling of multiple simultaneous device connections, all of which matter for daily pairing with earbuds, smartwatches, and car systems. The Realme also pulls ahead on cellular download speeds, rated at 3300 Mbps versus the Vivo's 2500 Mbps, giving it higher theoretical throughput on fast 5G networks.

The sensor suite adds further separation. The Realme includes a gyroscope and an infrared sensor, neither of which the Vivo Y31 carries. A gyroscope enables accurate motion-based features — essential for augmented reality apps, immersive gaming, and image stabilization algorithms. The infrared sensor allows the phone to function as a universal remote for TVs and appliances, a practical convenience the Vivo simply cannot offer. Both phones share GPS, compass, accelerometer, fingerprint scanner, and Galileo satellite support.

The Realme 15T 5G holds a clear and well-rounded advantage in this category. Its newer Bluetooth version, higher download speed ceiling, gyroscope, and infrared blaster collectively represent a meaningfully richer connectivity and features package than what the Vivo Y31 provides.

The miscellaneous category offers very little to differentiate the two phones — every data point is identical. Both the Realme 15T 5G and the Vivo Y31 5G include a video light, and neither features a sapphire glass display, a curved screen, or an e-paper panel.

This is a complete tie by the available data. No advantage can be assigned to either device based on the specs provided in this group.