| Hardware and OS | Xiaomi Mi Mix 4 | Oppo A3s |
| Operating system | Android 11, MIUI 12.5 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-core (1x2.99 GHz Kryo 680 & 3x2.42 GHz Kryo 680, 4x1.80 GHz Kryo 680) | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Adreno 660 | Adreno 506 |
| RAM | 8 GB, 12 GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 128 GB, 256 GB, 512 GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | No | |
| User Interface | Yes | |
| Display | Xiaomi Mi Mix 4 | Oppo A3s |
| Type | AMOLED | IPS LCD |
| Size | 6.67-inch | 6.2" inc |
| Resolution | 1080 x 2400 pixels | 720 x 1520 px |
| Touchscreen | Yes | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | ~395 ppi density | 271 PPI |
| Protection | Corning Gorilla Glass Victus | |
| Colors | 16 Millions Colors | 16M |
| Features | Wide color gamut, True-tone | |
| Connectivity | Xiaomi Mi Mix 4 | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 5G Network | 1, 3, 5, 8, 28, 41, 77, 78, 79 SA/NSA/Sub6 | |
| 4G Network | 1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28, 34, 38, 39, 40, 41, 42 | LTE |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac/6e, dual-band, Wi-Fi Direct, hotspot | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| NFC | Yes | |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | | 4.2, A2DP, LE |
| Edge | | Yes |
| SIM | Nano SIM | |
| GPRS | | Yes |
| Dual SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| GPS | Yes, with dual-band A-GPS, GLONASS, GALILEO, BDS, QZSS, NavIC | Yes, with A-GPS |
| Wireless Charging | No | |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A, 5G | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | USB Type-C 2.0 | microUSB 2.0, USB On-The-Go |
| Camera | Xiaomi Mi Mix 4 | Oppo A3s |
| Main camera | 108 MP (wide), 8 MP (periscope telephoto), 13 MP (ultrawide) | 13 MP, Dual |
| Image | 4320p | |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | Dual-LED flash, HDR, panorama | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 20 MP (wide) | 8 MP, Single |
| Multimedia | Xiaomi Mi Mix 4 | Oppo A3s |
| Loudspeaker | Yes | |
| Handsfree | Yes | |
| Video Playback | Yes | |
| 3.5 mm Jack | No | Yes |
| Video Out | Yes | |
| Radio | No | FM radio |
| Ring Tones | Yes | |
| Design | Xiaomi Mi Mix 4 | Oppo A3s |
| Colors | | Red, Dark Purple |
| Dimensions | 162.6 x 75.4 x 8 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 225 g | 168 g |
| Waterproof | IP53, dust and splash protection | |
| Battery | Xiaomi Mi Mix 4 | Oppo A3s |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Capacity | Li-Po 4500 mAh, Fast charging 120W, 100% in 15 min (advertised), Fast wireless charging 50W, 100% in 28 min (advertised), Quick Charge 4, Power Delivery 3.0. | |
| Placement | Non-Removable | |
| Other | Xiaomi Mi Mix 4 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Fingerprint (under display, optical), accelerometer, gyro, proximity, compass, color spectrum, Ultra Wideband (UWB) support, | Accelerometer, proximity, compass |
