| Hardware and OS | HTC U12 | Oppo A3s |
| Operating system | Android OS, v7.1 (Nougat) | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-core | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Adreno 550 | Adreno 506 |
| RAM | 6/8GB | |
| Internal memory | | 16 GB, 2 GB RAM |
| Internal Storage | 64/128GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Memory Card Slot | microSD, up to 256 GB (uses SIM 2 slot) | |
| User Interface | HTC Sense | |
| Display | HTC U12 | Oppo A3s |
| Type | Super LCD5 | IPS LCD |
| Size | 5.8 inches | 6.2" inc |
| Resolution | 2160 x 3840 pixels | 720 x 1520 px |
| Touchscreen | | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Display area | | 95.9 cm2 |
| Protection | Yes, Corning Gorilla Glass 6 | |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | 800 PPI | 271 PPI |
| Colors | | 16M |
| Connectivity | HTC U12 | Oppo A3s |
| NFC | yes | |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | | LTE |
| SIM | Standard SIM | |
| Wi-Fi | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Dual SIM | Single SIM or Dual SIM | |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS |
| Speed | HSPA 42.2/5.76 Mbps, LTE-A (4CA) Cat16 1024/75 Mbps | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | v3.1, Type-C 1.0 reversible connector | microUSB 2.0, USB On-The-Go |
| Camera | HTC U12 | Oppo A3s |
| Image | 2160 x 3840 pixels | |
| Main camera | | 13 MP, Dual |
| Specs | | 13 MP, f/2.2, AF
-2 MP, f/2.4, depth sensor |
| Features | dual-LED (dual tone) flash | LED flash, HDR, panorama |
| Video | | 1080p@30fps |
| Selfie camera | 16MP | 8 MP, Single |
| Multimedia | HTC U12 | Oppo A3s |
| 3.5 mm Jack | No | Yes |
| Radio | Not Supported | FM radio |
| Design | HTC U12 | Oppo A3s |
| Colors | | Red, Dark Purple |
| Dimensions | | 156.2 x 75.6 x 8.2 mm |
| Weight | | 168 g |
| Battery | HTC U12 | Oppo A3s |
| Capacity | 3500 mAh | |
| Placement | Non-Removable | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | HTC U12 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
