| Samsung Galaxy A21 |
Oppo A3s |
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| Hardware and OS | Samsung Galaxy A21 | Oppo A3s |
| Operating system | Android v10 (Q) | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa core, 2.3 GHz | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Qualcomm SDM450 Snapdragon 450 (14 nm) | |
| Architecture | 64 bit | |
| GPU | Adreno 506 | |
| RAM | 3 GB | |
| Internal memory | 32 GB | 16 GB, 2 GB RAM |
| External memory | microSD, up to 256 GB (dedicated slot) | |
| Expandable Memory | yes Up to 512 GB | |
| SIM Slot(s) | Dual SIM, GSM GSM | |
| Display | Samsung Galaxy A21 | Oppo A3s |
| Type | IPS LCD | |
| Size | 6.2" inc | |
| Screen Size | 6.5 inches (16.51 cm) | |
| Resolution | 720 x 1520 px | |
| Screen Resolution | 720 x 1600 pixels | |
| Touchscreen | capacitive touchscreen | |
| Display Type | Super AMOLED | |
| Screen-to-Body Ratio | 81.2% | |
| Display area | 95.9 cm2 | |
| Aspect Ratio | 20:9 | |
| Display aspect ratio | 19:9 (height:width) | |
| Touch Screen | yes Capacitive Touchscreen, Multi-touch | |
| Pixel Density | 270 ppi | 271 PPI |
| Colors | 16M | |
| Main Camera | Samsung Galaxy A21 | Oppo A3s |
| Resolution | 16 MP Primary Camera 8 MP, Wide Angle, Ultra-Wide Angle Camera 2 MP, Macro Camera 2 MP, Depth Camera | |
| Image Resolution | 4616 x 3464 Pixels | |
| Flash | yes LED Flash | |
| Camera Features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Autofocus | yes | |
| Shooting Modes | Continuos Shooting, High Dynamic Range mode (HDR) | |
| Settings | Exposure compensation, ISO control | |
| Connectivity | Samsung Galaxy A21 | Oppo A3s |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | |
| 3G Network | HSDPA 850 / 900 / 2100 | |
| 4G Network | LTE | |
| Wi-Fi | yes Wi-Fi 802.11, b/g/n | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | 4G: Available , 3G: Available, 2G: Available | GSM / HSPA / LTE |
| SIM card | Dual SIM (Nano-SIM, dual stand-by) | |
| Bluetooth | yes v5.0 | 4.2, A2DP, LE |
| Edge | Yes | |
| GPRS | Yes | |
| GPS | yes with A-GPS, Glonass | Yes, with A-GPS |
| SIM Size | SIM1: Nano, SIM2: Nano | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps | |
| USB | microUSB 2.0, USB On-The-Go | |
| VoLTE | yes | |
| Wi-Fi Features | Mobile Hotspot | |
| USB Connectivity | Mass storage device, USB charging | |
| Front Camera | Samsung Galaxy A21 | Oppo A3s |
| Resolution | 13 MP Primary Camera | |
| Camera | Samsung Galaxy A21 | 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 | Samsung Galaxy A21 | Oppo A3s |
| Audio Jack | 3.5 mm | |
| Loudspeaker | yes | |
| 3.5 mm Jack | Yes | |
| Radio | FM radio | |
| Design | Samsung Galaxy A21 | Oppo A3s |
| Build Material | Back: Plastic | |
| Colours | Black | |
| Colors | Red, Dark Purple | |
| Dimensions | 156.2 x 75.6 x 8.2 mm | |
| Weight | 168 g | |
| Battery | Samsung Galaxy A21 | Oppo A3s |
| Type | Li-ion | |
| Capacity | 4000 mAh | |
| User Replaceable | No | |
| Quick Charging | yes Fast, 15W | |
| Battery capacity | 4230 mAh, Non-removable Li-Ion | |
| USB Type-C | yes | |
| Other | Samsung Galaxy A21 | Oppo A3s |
| Release date | 2018, July | |
| Sensors | Accelerometer, proximity, compass | |
| Features | Samsung Galaxy A21 | Oppo A3s |
| Fingerprint Sensor | yes | |
| Fingerprint Sensor Position | Rear | |
| Other Sensors | Light sensor, Proximity sensor, Accelerometer |
