Vivo Y31 5G VS Xiaomi Poco F7 256GB

Both the Vivo Y31 5G and the Poco F7 share the same IP68 waterproof rating, meaning both can withstand submersion in up to 1.5 meters of fresh water for 30 minutes. Neither carries a rugged build or a foldable form factor, so they are on equal footing when it comes to durability credentials.

Where they diverge is in their physical dimensions. The Vivo Y31 5G is notably taller at 166.1 mm versus the Poco F7's 163.1 mm, and slightly thicker at 8.4 mm compared to 8.2 mm. The cumulative effect is a measurably larger overall volume — 107.43 cm³ for the Vivo against 104.19 cm³ for the Poco — making the Poco F7 the more compact device in hand. Counterintuitively, however, the Vivo Y31 5G is the lighter of the two at 209 g versus the Poco F7's 215.7 g, a ~6.7 g difference that is noticeable during extended one-handed use.

In terms of design, neither phone has a decisive overall advantage, but the choice depends on what you prioritize: the Poco F7 wins on compactness and footprint, making it easier to pocket and grip, while the Vivo Y31 5G has a slight edge in pure weight. For most users, the Poco F7's more compact volume will feel like the more ergonomic option.

The display is where these two phones diverge most dramatically. The Poco F7 uses an OLED/AMOLED panel versus the Vivo Y31 5G's LCD IPS screen — a fundamental technology gap. OLED produces true blacks by switching off individual pixels, delivering superior contrast, more vivid colors, and better power efficiency during dark-themed content. The LCD in the Vivo simply cannot replicate this, regardless of other tuning.

The resolution gap compounds this difference significantly. The Poco F7 resolves at 1280 x 2772 px across its 6.83″ screen, yielding a pixel density of 447 ppi — text and fine detail appear razor-sharp. The Vivo Y31 5G, at 720 x 1608 px on a 6.68″ panel, lands at just 264 ppi, which is a noticeable step down in everyday sharpness, especially when reading small text or viewing high-resolution photos. The shared 120Hz refresh rate ensures smooth scrolling on both, so neither has an advantage there. Both also feature branded damage-resistant glass, putting them on equal footing for screen protection.

The Poco F7 further extends its lead with support for HDR10, HDR10+, and Dolby Vision, meaning streaming content from compatible platforms will render with wider dynamic range and more accurate brightness — something the Vivo Y31 5G entirely lacks. The Always-On Display on the Poco F7 adds practical convenience, too. Across every meaningful display metric, the Poco F7 holds a clear and substantial advantage.

At the heart of this comparison lies a significant chipset tier gap. The Vivo Y31 5G runs on the Snapdragon 4 Gen 2, a capable mid-range processor with a modest peak CPU speed of 2.3 GHz and an Adreno 613 GPU clocked at 955 MHz. The Poco F7 counters with the Snapdragon 8s Gen 4, a flagship-adjacent chip featuring a heterogeneous cluster with cores reaching up to 3.21 GHz and an Adreno 825 GPU running at 1150 MHz. In practical terms, this translates to dramatically faster app launches, smoother multitasking, and a far superior gaming experience on the Poco F7 — particularly in GPU-intensive titles where the Adreno 825 holds a generational advantage over the Adreno 613.

The memory configuration reinforces this gap. The Poco F7 ships with 12GB of RAM at 4800 MHz and 256GB of storage, compared to the Vivo's 6GB of RAM at 3200 MHz and 128GB of storage. More RAM at higher bandwidth means the Poco F7 can keep more apps active in the background without reloading, and data moves between the CPU and memory substantially faster. The Poco F7 also supports a higher maximum memory ceiling of 24GB versus 16GB on the Vivo, relevant for users who push their devices hard over time.

One nuance worth noting: the Poco F7's TDP of 12.5W versus the Vivo's 4W reflects the raw power demands of its flagship chip — it will run hotter and draw more battery under sustained load. That is a trade-off for its performance class, not a flaw. Across every key performance metric, the Poco F7 holds a commanding and unambiguous advantage.

Both phones share a 50 MP main sensor, but the Poco F7 pulls ahead immediately with a dual-lens rear system — adding an 8 MP secondary camera — while the Vivo Y31 5G relies on a single rear lens. More consequentially, the Poco F7 includes optical image stabilization (OIS), which physically compensates for hand tremor during shooting. The Vivo lacks OIS entirely, meaning low-light shots and video footage will be more prone to blur and shakiness — a meaningful real-world disadvantage for anyone who shoots handheld in challenging conditions.

The video capability gap is equally stark. The Poco F7 records at up to 4K 60fps, while the Vivo Y31 5G tops out at 1080p 30fps — a two-generation gap in video resolution that will be immediately visible when played back on modern screens. For content creators or anyone who values video quality, this distinction alone is significant. The Poco F7 also supports RAW photo capture, giving photographers the ability to post-process images with full tonal data — a feature entirely absent on the Vivo, which locks users into JPEG output.

On the front camera, the Poco F7 offers a 20 MP selfie shooter versus the Vivo's 8 MP, a substantial resolution advantage for selfies and video calls. The broader manual controls and shared features — such as phase-detection autofocus, slow-motion, and timelapse — are present on both, so neither has an edge there. Overall, the Poco F7 holds a clear and comprehensive advantage across every meaningful camera differentiator: multi-lens versatility, OIS, 4K video, RAW support, and a higher-resolution front camera.

From an operating system standpoint, these two phones are remarkably aligned. Both ship with Android 15 and carry an identical feature set across privacy controls, productivity tools, and customization options — including dynamic theming, split-screen multitasking, picture-in-picture, offline voice recognition, and on-device machine learning. Neither receives direct OS updates, and neither supports PC mode or Quick Start, so users on both devices are on equal footing for the vast majority of day-to-day software experience.

The sole differentiator across this entire spec group is Wi-Fi password sharing, which is supported on the Poco F7 but absent on the Vivo Y31 5G. This feature allows users to share their Wi-Fi credentials with nearby contacts instantly, without manually reading out a password — a small but genuinely convenient quality-of-life addition for households or frequent hosts.

Given how minimal the gap is, this category is effectively a near-tie. The Poco F7 has a marginal edge courtesy of Wi-Fi password sharing, but no user should factor the OS comparison heavily into their purchasing decision — the software experience on both devices is substantively identical.

Capacity-wise, these two phones are perfectly matched: both pack a 6500 mAh battery, a generously large cell that comfortably supports full-day and potentially two-day usage for moderate users. Neither offers wireless charging or a removable battery, so on raw endurance potential, there is nothing to separate them.

Where they diverge is charging speed. The Poco F7 supports 90W fast charging versus the Vivo Y31 5G's 44W — more than double the wattage. Charging the same 6500 mAh battery at 90W versus 44W translates to dramatically shorter time plugged in; for a user topping up during a lunch break or before heading out, that difference is felt daily. However, there is an important trade-off: the Vivo Y31 5G comes with a charger in the box, while the Poco F7 does not. Users buying the Poco F7 will need to source a compatible high-wattage charger separately to actually benefit from its 90W capability — adding to the effective purchase cost.

On balance, the Poco F7 holds the charging speed advantage, but the Vivo Y31 5G's bundled charger softens the gap for budget-conscious buyers. If a fast, compatible charger is already on hand, the Poco F7 is the clear winner here; if not, the real-world convenience edge narrows considerably.

For wired listening, both phones make the same call: no 3.5mm headphone jack, so users on either device are pushed toward Bluetooth or USB-C audio. Both also feature stereo speakers, putting them on equal footing for built-in playback. The meaningful split comes down to wireless audio codec support.

The Poco F7 supports aptX, aptX HD, aptX Adaptive, and LDAC — the Vivo Y31 5G supports none of these. In practice, this matters significantly for anyone using premium Bluetooth headphones or earbuds. LDAC, developed by Sony, transmits audio at up to three times the bitrate of standard Bluetooth, preserving far more detail from high-resolution audio sources. aptX Adaptive goes further by dynamically adjusting bitrate to balance quality and latency — making it well-suited for both music and low-latency gaming or video use. Without any of these codecs, the Vivo is limited to standard SBC or AAC Bluetooth transmission, which is adequate but noticeably inferior when paired with high-quality wireless audio hardware.

For casual listeners using budget earbuds, this gap may go unnoticed. But for anyone invested in quality Bluetooth headphones, the Poco F7 holds a clear and practical advantage in audio fidelity over wireless — and that edge is entirely absent on the Vivo Y31 5G.

Wireless connectivity is an area where the Poco F7 pulls well ahead. While both phones support 5G and share a dual-SIM slot, the Poco F7 extends its Wi-Fi support all the way to Wi-Fi 7 (802.11be), whereas the Vivo Y31 5G tops out at Wi-Fi 5 (802.11ac). Wi-Fi 6 and 7 bring significantly higher throughput, lower latency, and better performance in congested environments — a future-proofing advantage that will matter increasingly as compatible routers become mainstream. The cellular speed gap is equally telling: the Poco F7 reaches 4200 Mbits/s download and 3500 Mbits/s upload, compared to 2500 Mbits/s and 900 Mbits/s on the Vivo — particularly notable on the upload side, where the Poco F7 is nearly four times faster, benefiting video uploads and cloud backups on fast networks.

Bluetooth tells a similar story. The Poco F7 ships with Bluetooth 6 versus Bluetooth 4.2 on the Vivo — a generational leap that brings improved range, connection stability, and lower power consumption. The Poco F7 also adds NFC, enabling contactless payments and quick device pairing, while the Vivo Y31 5G lacks NFC entirely. Additionally, the Poco F7 includes a gyroscope and an infrared sensor — the former enabling more accurate motion-based gaming and AR applications, the latter allowing the phone to function as a universal TV remote. None of these are present on the Vivo.

The one area where the Vivo Y31 5G holds an exclusive advantage is its external memory slot, which the Poco F7 omits. For users who rely on microSD cards for expandable storage, this is a genuine consideration. That said, given the breadth and magnitude of the Poco F7's connectivity advantages — newer Wi-Fi, faster cellular, Bluetooth 6, NFC, gyroscope, and IR sensor — the Poco F7 is the clear winner in this category overall.

The miscellaneous spec group for these two phones is a complete wash. Both the Vivo Y31 5G and the Poco F7 share identical attributes across every data point here: both include a video light, and neither features a sapphire glass display, a curved screen, or an e-paper panel.

This is a tie in every meaningful sense — there is no differentiator in this category that should influence a purchasing decision either way.