Vivo Y31 Pro 5G (8GB RAM + 256GB) has better RAM than Vivo Y31 (6GB RAM + 128GB). Vivo Y31 Pro 5G (8GB RAM + 256GB) has more internal memory than Vivo Y31 (6GB RAM + 128GB)
| Name | Vivo Y31 (6GB RAM + 128GB) | Vivo Y31 Pro 5G (8GB RAM + 256GB) | 
| RAM | 6 GB | 8 GB | 
|---|---|---|
| Display | 6.58 in | 6.72 in | 
| Internal Memory | 128 GB | 256 GB | 
| Battery | 5000 mAh | 6500 mAh | 
| Camera | 48 MP + 2 MP + 2 MP Triple | 50 MP + 2 MP Dual | 
| Price | Rs. 15990 | Rs. 20999 | 
The launch Date of the first phone is January 20, 2021. The cost of Vivo Y31 (6GB RAM + 128GB) is Rs. 15990. The cost of Vivo Y31 Pro 5G (8GB RAM + 256GB) is Rs. 20999.
Vivo Y31 Pro 5G (8GB RAM + 256GB) has larger screen size of 6.72 inches in comparison to Vivo Y31 (6GB RAM + 128GB)'s 6.58 inch screen. Vivo Y31 (6GB RAM + 128GB) has IPS LCD Screen type where as Vivo Y31 Pro 5G (8GB RAM + 256GB) has LCD Screen type. Vivo Y31 (6GB RAM + 128GB) has display density of 401 PPI & Vivo Y31 Pro 5G (8GB RAM + 256GB) has only 393 PPI display density. In terms of screen to body ratio, Vivo Y31 Pro 5G (8GB RAM + 256GB) has better screen to body ratio of ~ 90.7% than Vivo Y31 (6GB RAM + 128GB)'s ~ 84.5%. Both phones have same aspect ratio of 20:9.
Vivo Y31 Pro 5G (8GB RAM + 256GB)'s larger 8 GB RAM is better for playing games and all with respect to Vivo Y31 (6GB RAM + 128GB)'s lower 6 GB RAM. Vivo Y31 Pro 5G (8GB RAM + 256GB) has more Internal Memory (256 GB) than Vivo Y31 (6GB RAM + 128GB) (128 GB).
Vivo Y31 Pro 5G (8GB RAM + 256GB)'s 50 MP + 2 MP Dual Rear Camera outclasses Vivo Y31 (6GB RAM + 128GB)'s 48 MP + 2 MP + 2 MP Triple Rear Camera in terms of resolution. Vivo Y31 (6GB RAM + 128GB) will be better choice if you're looking to click lot of selfies as it has better 16 MP Front Camera in comparison to Vivo Y31 Pro 5G (8GB RAM + 256GB)'s 8 MP Front Camera.
Both the phones has Android Operating System but the first one runs on version 11 and the second one on 15 version.
| Name | Vivo Y31 (6GB RAM + 128GB) | Vivo Y31 Pro 5G (8GB RAM + 256GB) | 
| General | ||
| Model | Y31 2021 | Y31 Pro 5G | 
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM (Hybrid Slot) | 
| Dual Sim | Yes | Yes | 
| Sim Size | Nano+Nano SIM | Nano+Nano SIM | 
| SAR | 0.99 W/kg (Head) 0.94 W/kg (Body)  | |
| Device Type | Smartphone | Smartphone | 
| Release Date | January 20, 2021 | |
| In The Box | Y31 Pro 5G, Quick Start Guide, USB Cable, Charger, Eject Tool, Phone Case, Protective Film (applied), Warranty Card | |
| Design | ||
| Dimensions | 75 x 163 x 8.4 mm | 76.3 x 165.7 x 8.19 mm | 
| Weight | 188 g | 208 g | 
| Bezel less | No | |
| Colors | Dreamy White / Mocha Brown | |
| Display | ||
| Type | Color IPS LCD Screen (16M Colors) | Color LCD Screen (16M Colors) | 
| Touch | Yes | Yes | 
| Size | 6.58 inches, 1080 x 2408 pixels | 6.72 inches, 1080 x 2408 pixels, 120 Hz | 
| Aspect Ratio | 20:9 | 20:9 | 
| PPI | ~ 401 PPI | ~ 393 PPI | 
| Screen to Body Ratio | ~ 84.5% | ~ 90.7% | 
| Brightness | 1050 nits | |
| Features | 83% NTSC | |
| Notch | Yes, Water Drop Notch | Yes, Punch Hole | 
| Memory | ||
| RAM | 6 GB | 8 GB | 
| RAM Type | LPDDR4X | |
| Expandable RAM | Upto 8 GB Extra Virtual RAM | |
| Storage | 128 GB | 256 GB | 
| Storage Type | UFS 3.1 | |
| Card Slot | Yes, upto 1 TB | |
| Connectivity | ||
| GPRS | Yes | Yes | 
| EDGE | Yes | Yes | 
| 3G | Yes | Yes | 
| 4G | Yes | Yes | 
| 5G | Yes | |
| 5G Bands | n1/n3/n5/n8/n28B/n40/n77/n78 | |
| VoLTE | Yes, Dual Stand-By | Yes, Dual Stand-By | 
| Wifi | Yes, with wifi-hotspot | Yes, with wifi-hotspot | 
| Wifi Version | 2.4 GHz / 5 GHz | |
| Bluetooth | Yes, v5.0, A2DP, LE | Yes, v5.4 | 
| USB | Yes, USB-C v2.0 | Yes, USB-C v2.0 | 
| USB Features | USB on-the-go, USB Charging | USB Tethering, USB on-the-go, USB Charging | 
| IR Blaster | Yes | |
| Extra | ||
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS | GPS, BeiDou, GLONASS, Galileo, QZSS | 
| Fingerprint Sensor | Yes, Side | Yes, Side | 
| Face Unlock | Yes | Yes | 
| Sensors | Accelerometer, Ambient Light Sensor, Proximity Sensor, E-compass, Virtual Gyroscope | Accelerometer, Color Temperature Sensor, Ambient Light Sensor, Proximity Sensor, E-compass, Gyroscope, Infrared blaster | 
| 3.5mm Headphone Jack | Yes | |
| AI Features | AI Erase, AI Photo Enhance, Smart AI Assistant, AI SuperLinK | |
| Splash Resistant | Yes | |
| IP Rating | IP64 | |
| Dust Resistant | Yes | |
| Extra Features | Dual SIM Dual Standby (DSDS) | |
| Camera | ||
| Rear Camera | 48 MP ƒ/1.8 (Wide Angle) 2 MP ƒ/2.4 (Macro) Macro 2 MP ƒ/2.4 (Depth Sensor)  | 50 MP ƒ/1.8 (Main) 2 MP ƒ/2.4 Bokeh  | 
| Auto Focus | Yes | Yes | 
| Features | Portrait, Photo, Video, Pano, Live Photo, Slo-Mo, Time-Lapse, Pro, DOC, Super Night Mode | Photo, Night, Portrait, Video, Live Photo, Slo-mo, Time-lapse, Pro, Pano, Documents, 50 MP, Scan | 
| Video Recording | 4K @ 30 fps UHD, 1080p @ 30 fps FHD | 1080p, 4K @ 30 fps UHD | 
| Flash | Yes, LED | Yes, LED | 
| Front Camera | 16 MP ƒ/2 (Wide Angle) | 8 MP ƒ/2 Punch Hole  | 
| Front Video Recording | 1080p @ 30 fps FHD | 1080p | 
| Technical | ||
| OS | Android v11 | Android v15 | 
| Chipset | Qualcomm Snapdragon 662 | MediaTek Dimensity 7300 | 
| CPU | 2 GHz, Octa Core Processor | Octa Core Processor | 
| Core Details | 4x2.0 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver | |
| GPU | Adreno 610 | |
| Java | No | No | 
| Browser | Yes, supports HTML5 | Yes | 
| Multimedia | ||
| Yes | Yes | |
| Music | Yes | WAV, MP3, MP2, AMR-NB, MIDI, Vorbis, APE, FLAC, OGG, M4A | 
| Video | Yes | MP4, 3GP, AVI, TS, MKV, FLV | 
| FM Radio | Yes | No | 
| Speaker Type | Dual Stereo | |
| Audio Features | Hi-Res Audio Certification | |
| Battery | ||
| Type | Non-Removable Battery | Non-Removable Battery | 
| Size | 5000 mAh, Li-ion Battery | 6500 mAh, Li-ion Battery | 
| Fast Charging | Yes, 18W Fast Charging | Yes, 44W |