| Hardware and OS | Xiaomi Redmi Note 3 | Oppo A3s |
| Operating system | Android 5.1.1 (Lollipop), upgradable to 6.0.1 (Marshmallow), MIUI 9.5 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Hexa-core (4x1.4 GHz Cortex-A53 & 2x1.8 GHz Cortex-A72) | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Qualcomm MSM8956 Snapdragon 650 | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Adreno 510 | Adreno 506 |
| Internal memory | 16GB 2GB RAM (Standard version), 32GB 3GB RAM (High/Special version) | 16 GB, 2 GB RAM |
| External memory | microSDXC (uses shared SIM slot) | microSD, up to 256 GB (dedicated slot) |
| Display | Xiaomi Redmi Note 3 | Oppo A3s |
| Type | IPS LCD | IPS LCD |
| Size | 5.5 inches, 82.6 cm2 | 6.2" inc |
| Resolution | 1080 x 1920 pixels, 16:9 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 | Xiaomi Redmi Note 3 | Oppo A3s |
| Camera | 16 MP, f/2.0, PDAF | |
| Features | Dual-LED dual-tone flash, HDR, panorama | |
| Video | 1080p@30fps | |
| Selfie camera | Xiaomi Redmi Note 3 | Oppo A3s |
| Camera | 5 MP, f/2.0 | |
| Video | 1080p@30fps | |
| Connectivity | Xiaomi Redmi Note 3 | 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 - Global | HSDPA 850 / 900 / 2100 |
| 4G Network | 1, 3, 5, 7, 8, 38, 39, 40, 41 - Global | 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) |
| CDMA | HSDPA 850 / 900 / 1900 / 2100 - Special edition (Taiwan) | |
| Bluetooth | 4.1, A2DP, LE | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| Infrared port | Yes | |
| GPS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS |
| NFC | No | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A Cat6 300/50 Mbps | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | microUSB 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 | Xiaomi Redmi Note 3 | 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 Redmi Note 3 | Oppo A3s |
| Loudspeaker | Yes | |
| Multimedia | 24-bit/192kHz audio
| |
| 3.5 mm Jack | Yes | Yes |
| Radio | Stereo FM radio, recording | FM radio |
| Design | Xiaomi Redmi Note 3 | Oppo A3s |
| Colors | Silver, Gray, Gold | Red, Dark Purple |
| Body build | Glass front, aluminum back, aluminum frame | |
| Dimensions | 150 x 76 x 8.7 mm (5.91 x 2.99 x 0.34 in) | 156.2 x 75.6 x 8.2 mm |
| Weight | 164 g (5.78 oz) | 168 g |
| SIM | Hybrid Dual SIM (Micro-SIM/Nano-SIM, dual stand-by) | |
| Battery | Xiaomi Redmi Note 3 | Oppo A3s |
| Type | Li-Po 4050 mAh, non-removable | |
| Charging | Charging 10W | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | Xiaomi Redmi Note 3 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
| Features | Xiaomi Redmi Note 3 | Oppo A3s |
| Sensors | Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass | |
