| Hardware and OS | Xiaomi Mi MIX 3 Palace Museum Edition | Oppo A3s |
| Operating system | MIUI V10 (Android 8.1 Oreo) MIUI (Android 9.0 Pie) | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa Core 4??2.8 GHz Kryo 385, 4??1.8 GHz Kryo 385 CPU Clock | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Qualcomm Adreno 630, 710 MHz | Adreno 506 |
| RAM | 10GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 256GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | External Card Not Supported | |
| User Interface | Yes with Modified Android | |
| Display | Xiaomi Mi MIX 3 Palace Museum Edition | Oppo A3s |
| Type | AMOLED capacitive touchscreen | IPS LCD |
| Size | 6.39 inches FHD | 6.2" inc |
| Resolution | 2340 x 1080 Pixels, 24 bit color depth | 720 x 1520 px |
| Touchscreen | Yes Multi-Touch Support | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | ~ 403 ppi | 271 PPI |
| Protection | Yes | |
| Colors | 16M Colors | 16M |
| Features | AMOLED FHD display, ~ 403 PPI, Capacitive, Multi-touch, Scratch Resistant, 60000:1 Contrast Ratio, 600 cd/m2, Corning Gorilla Glass, 2.5D curved glass screen, Frameless, HDR, Always-On Display, 103% NTSC | |
| Connectivity | Xiaomi Mi MIX 3 Palace Museum Edition | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | Yes | LTE |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, 802.11n 5GHz, Dual band, Wi-Fi Direct, Wi-Fi Display, Wi-Fi Hotspot, 2x2 MiMO | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| NFC | yes | |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| SIM | Nano SIM | |
| Bluetooth | | 4.2, A2DP, LE |
| Dual SIM | Dual SIM Card (Nano-SIM, Nano-SIM), Dual Standby | |
| Edge | | Yes |
| Wireless Charging | No | |
| GPRS | | Yes |
| GPS | Yes, with A-GPS, GPS (L1 L5), GLONASS (L1), BeiDou (B1), Galileo (E1 E5a) | Yes, with A-GPS |
| Speed | | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | Type-C USB v2.0 with Host, OTG, Charging and Mass Storage Function | microUSB 2.0, USB On-The-Go |
| Camera | Xiaomi Mi MIX 3 Palace Museum Edition | Oppo A3s |
| Image | 4032 x 3024 Pixels | |
| Main camera | 12 Megapixels, 12 Megapixels (Dual Rear Camera) | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | Yes with Dual-LED flashlight | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 24 MP, 2 MP with Aperture F2.0, Popp-up Front Camera | 8 MP, Single |
| Multimedia | Xiaomi Mi MIX 3 Palace Museum Edition | Oppo A3s |
| Loudspeaker | Yes with Dual Speakers | |
| Handsfree | Yes | |
| Video Playback | Yes Support 3GP, H.263, H.264, xVID, WMV, FLV, MP4, H.2653GP, M4V, MKV, MOV, AVI,, H.264, MKV, AVI, xVID, WMV, FLV, MP4, H.265 | |
| Video Out | Yes with Wireless Media Connection | |
| Ring Tones | MP3, WAV, MIDI ringtones | |
| 3.5 mm Jack | yes | Yes |
| Radio | Yes | FM radio |
| Design | Xiaomi Mi MIX 3 Palace Museum Edition | Oppo A3s |
| Colors | | Red, Dark Purple |
| Waterproof | No | |
| Dimensions | 74.7 mm x 157.9 mm x 8.5 mm | 156.2 x 75.6 x 8.2 mm |
| Weight | 218 g | 168 g |
| Battery | Xiaomi Mi MIX 3 Palace Museum Edition | Oppo A3s |
| Capacity | 3,200 mAh Lithium-Polymer | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Placement | Non-Removable | |
| Other | Xiaomi Mi MIX 3 Palace Museum Edition | Oppo A3s |
| Release date | | 2018, July |
| Sensors | Proximity, Light, Accelerometer, Compass, Gyroscope, Fingerprint, Hall, Infrared face recognition sensor | Accelerometer, proximity, compass |
