Vivo Y31 (6GB RAM + 128GB) has better RAM than Vivo Y31A. In terms of display resolution, Vivo Y31 (6GB RAM + 128GB) has better resolution of 2408 x 1080 than Vivo Y31A which has resolution of 960 x 540. Vivo Y31 (6GB RAM + 128GB) has more internal memory than Vivo Y31A
| Name | Vivo Y31A | Vivo Y31 (6GB RAM + 128GB) | 
| RAM | 1 GB | 6 GB | 
|---|---|---|
| Display | 4.7 in | 6.58 in | 
| Internal Memory | 16 GB | 128 GB | 
| Battery | 2100 mAh | 5000 mAh | 
| Camera | 8 MP | 48 MP + 2 MP + 2 MP Triple | 
| Price | Rs. 9999 | Rs. 15990 | 
The cost of Vivo Y31A is Rs. 9999. The launch Date of the second phone is January 20, 2021. The cost of Vivo Y31 (6GB RAM + 128GB) is Rs. 15990.
Vivo Y31 (6GB RAM + 128GB) has larger screen size of 6.58 inches in comparison to Vivo Y31A's 4.7 inch screen. Vivo Y31 (6GB RAM + 128GB) has display density of 401 PPI & Vivo Y31A has only 234 PPI display density. Vivo Y31A has 16:9 aspect ratio where as Vivo Y31 (6GB RAM + 128GB) has 20:9 aspect ratio.
Vivo Y31 (6GB RAM + 128GB)'s larger 6 GB RAM is better for playing games and all with respect to Vivo Y31A's lower 1 GB RAM. Vivo Y31 (6GB RAM + 128GB) has more Internal Memory (128 GB) than Vivo Y31A (16 GB).
Vivo Y31 (6GB RAM + 128GB)'s 48 MP + 2 MP + 2 MP Triple Rear Camera outclasses Vivo Y31A's 8 MP 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 Y31A's 2 MP Front Camera.
Both the phones has Android Operating System but the first one runs on version 5.0 and the second one on 11 version.
| Name | Vivo Y31A | Vivo Y31 (6GB RAM + 128GB) | 
| General | ||
| Model | Y31 2021 | |
| Sim Type | Dual Sim, GSM+GSM | Dual Sim, GSM+GSM | 
| Dual Sim | Yes | Yes | 
| Sim Size | Nano+Nano SIM | |
| Device Type | Smartphone | |
| Release Date | January 20, 2021 | |
| Design | ||
| Dimensions | 137.19 x 68.7 x 8.3 mm | 75 x 163 x 8.4 mm | 
| Weight | 141 g | 188 g | 
| Display | ||
| Type | Color IPS LCD Screen (16M Colors) | |
| Touch | Yes | Yes | 
| Size | 4.7 inches, 540 x 960 pixels | 6.58 inches, 1080 x 2408 pixels | 
| Aspect Ratio | 16:9 | 20:9 | 
| PPI | ~ 234 PPI | ~ 401 PPI | 
| Screen to Body Ratio | ~ 84.5% | |
| Notch | Yes, Water Drop Notch | |
| Memory | ||
| RAM | 1 GB | 6 GB | 
| Storage | 16 GB | 128 GB | 
| Card Slot | Yes, upto 128 GB | Yes, upto 1 TB | 
| Connectivity | ||
| GPRS | Yes | |
| EDGE | Yes | |
| 3G | Yes | Yes | 
| 4G | Yes | |
| VoLTE | Yes, Dual Stand-By | |
| Wifi | Yes | Yes, with wifi-hotspot | 
| Bluetooth | Yes | Yes, v5.0, A2DP, LE | 
| USB | Yes, USB-C v2.0 | |
| USB Features | USB on-the-go, USB Charging | |
| Extra | ||
| GPS | Yes | Yes, with A-GPS, GLONASS, GALILEO, BDS | 
| Fingerprint Sensor | Yes, Side | |
| Face Unlock | Yes | |
| Sensors | Accelerometer | Accelerometer, Ambient Light Sensor, Proximity Sensor, E-compass, Virtual Gyroscope | 
| 3.5mm Headphone Jack | Yes | Yes | 
| Camera | ||
| Rear Camera | 8 MP | 48 MP ƒ/1.8 (Wide Angle) 2 MP ƒ/2.4 (Macro) Macro 2 MP ƒ/2.4 (Depth Sensor)  | 
| Auto Focus | Yes | |
| Features | Portrait, Photo, Video, Pano, Live Photo, Slo-Mo, Time-Lapse, Pro, DOC, Super Night Mode | |
| Video Recording | 4K @ 30 fps UHD, 1080p @ 30 fps FHD | |
| Flash | Yes | Yes, LED | 
| Front Camera | 2 MP | 16 MP ƒ/2 (Wide Angle) | 
| Front Video Recording | 1080p @ 30 fps FHD | |
| Technical | ||
| OS | Android v5.0 (Lollipop) | Android v11 | 
| Chipset | Qualcomm Snapdragon 410 | Qualcomm Snapdragon 662 | 
| CPU | Quad Core Processor | 2 GHz, Octa Core Processor | 
| Core Details | 4x2.0 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver | |
| GPU | Adreno 610 | |
| Java | Yes, via 3rd party | No | 
| Browser | Yes, supports HTML5 | |
| Multimedia | ||
| Yes | ||
| Music | Yes | |
| Video | Yes | |
| FM Radio | Yes | Yes | 
| Battery | ||
| Type | Removable Battery | Non-Removable Battery | 
| Size | 2100 mAh | 5000 mAh, Li-ion Battery | 
| Fast Charging | Yes, 18W Fast Charging | |