| vivo Y21s |
Oppo A3s |
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| Hardware and OS | vivo Y21s | Oppo A3s |
| Operating system | Android 11, Funtouch 11.1 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-core (2x2.0 GHz Cortex-A75 & 6x1.8 GHz Cortex-A55) | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Mediatek MT6769V/CU Helio G80 (12 nm) | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Mali-G52 MC2 | Adreno 506 |
| Internal memory | 128GB 4GB RAM, 128GB 6GB RAM | 16 GB, 2 GB RAM |
| External memory | microSDXC (dedicated slot) | microSD, up to 256 GB (dedicated slot) |
| Display | vivo Y21s | Oppo A3s |
| Type | IPS LCD | IPS LCD |
| Size | 6.51 inches, 102.3 cm2 | 6.2" inc |
| Resolution | 720 x 1600 pixels, 20:9 ratio | 720 x 1520 px |
| Touchscreen | capacitive touchscreen | |
| Screen-to-Body Ratio | 81.2% | |
| Display area | 95.9 cm2 | |
| Display aspect ratio | 19:9 (height:width) | |
| Pixel Density | 271 PPI | |
| Colors | 16M | |
| Main Camera | vivo Y21s | Oppo A3s |
| Camera | 50 MP, f/1.8, 24mm (wide), PDAF 2 MP, f/2.4, (macro) 2 MP, f/2.4, (depth) | |
| Features | LED flash | |
| Video | 1080p@30fps | |
| Selfie camera | vivo Y21s | Oppo A3s |
| Camera | 8 MP, f/2.0, (wide) | |
| Features | HDR | |
| Video | 1080p@30fps | |
| Connectivity | vivo Y21s | Oppo A3s |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 | HSDPA 850 / 900 / 2100 |
| 4G Network | 1, 2, 3, 4, 5, 7, 8, 20, 28, 38, 40, 41, 66 | LTE |
| Wi-Fi | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot | |
| Network | GSM / HSPA / LTE | |
| SIM card | Dual SIM (Nano-SIM, dual stand-by) | |
| Bluetooth | 5.0, A2DP, LE | 4.2, A2DP, LE |
| CDMA | HSDPA 850 / 900 / 2100 | |
| Edge | Yes | |
| GPRS | Yes | |
| GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS | Yes, with A-GPS |
| NFC | Yes (market/region dependent) | |
| Speed | HSPA 42.2/5.76 Mbps, LTE | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | USB Type-C 2.0, USB On-The-Go | microUSB 2.0, USB On-The-Go |
| Technology | GSM / HSPA / LTE | |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, hotspot | |
| Camera | vivo Y21s | Oppo A3s |
| Main camera | 13 MP, Dual | |
| Specs | 13 MP, f/2.2, AF -2 MP, f/2.4, depth sensor | |
| Features | LED flash, HDR, panorama | |
| Video | 1080p@30fps | |
| Selfie camera | 8 MP, Single | |
| Multimedia | vivo Y21s | Oppo A3s |
| Loudspeaker | Yes | |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio |
| Design | vivo Y21s | Oppo A3s |
| Colors | Midnight Blue, Pearl White | Red, Dark Purple |
| Dimensions | 164.3 x 76.1 x 8 mm (6.47 x 3.00 x 0.31 in) | 156.2 x 75.6 x 8.2 mm |
| Weight | 182 g (6.42 oz) | 168 g |
| SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Battery | vivo Y21s | Oppo A3s |
| Type | Li-Po 5000 mAh, non-removable | |
| Charging | Fast charging 18W Reverse charging | |
| Battery capacity | 4230 mAh, Non-removable Li-Ion | |
| Features | vivo Y21s | Oppo A3s |
| Sensors | Fingerprint (side-mounted), accelerometer, proximity, compass | |
| Other | vivo Y21s | Oppo A3s |
| Release date | 2018, July | |
| Sensors | Accelerometer, proximity, compass |
