| Hardware and OS | Xiaomi Poco C51 | Oppo A3s |
| Operating system | Android 13 (Go edition), MIUI | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-core (4x2.2 GHz Cortex-A53 & 4x1.7 GHz Cortex-A53) | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Mediatek Helio G36 (12 nm) | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | PowerVR GE8320 | Adreno 506 |
| Internal memory | 64GB 4GB RAM | 16 GB, 2 GB RAM |
| External memory | microSDXC (dedicated slot) | microSD, up to 256 GB (dedicated slot) |
| Display | Xiaomi Poco C51 | Oppo A3s |
| Type | IPS LCD, 400 nits (typ) | IPS LCD |
| Size | 6.52 inches, 102.6 cm2(~81.0% screen-to-body ratio) | 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 |
| Connectivity | Xiaomi Poco C51 | Oppo A3s |
| WLAN | Wi-Fi 802.11 b/g/n | |
| NFC | No | |
| 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 / 2100 | HSDPA 850 / 900 / 2100 |
| 4G Network | 1, 3, 5, 8, 40, 41 | LTE |
| Technology | GSM / HSPA / 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 |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | | Yes, with A-GPS |
| Speed | HSPA, LTE | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | microUSB 2.0, OTG | microUSB 2.0, USB On-The-Go |
| Main Camera | Xiaomi Poco C51 | Oppo A3s |
| Camera | 8 MP, f/2.0, (wide)
0.08 MP (depth) | |
| Features | Dual-LED flash, HDR | |
| Video | 1080p@30fps | |
| Selfie camera | Xiaomi Poco C51 | Oppo A3s |
| Camera | 5 MP, f/2.2 | |
| Video | 1080p@30fps | |
| Camera | Xiaomi Poco C51 | 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 | Xiaomi Poco C51 | Oppo A3s |
| Loudspeaker | Yes | |
| 3.5 mm Jack | Yes | Yes |
| Radio | | FM radio |
| Features | Xiaomi Poco C51 | Oppo A3s |
| Sensors | Fingerprint (rear-mounted), accelerometer | |
| Design | Xiaomi Poco C51 | Oppo A3s |
| SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Colors | Power Black, Royal Blue | Red, Dark Purple |
| Dimensions | 164.9 x 76.8 x 9.1 mm (6.49 x 3.02 x 0.36 in) | 156.2 x 75.6 x 8.2 mm |
| Weight | 192 g (6.77 oz) | 168 g |
| Battery | Xiaomi Poco C51 | Oppo A3s |
| Type | Li-Po 5000 mAh, non-removable | |
| Charging | 10W wired | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | Xiaomi Poco C51 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
