| Hardware and OS | HTC One M8 Prime | Oppo A3s |
| Operating system | Android 4.4.2 (KitKat); Sense UI | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | | Adreno 506 |
| Internal memory | 16GB 3GB RAM, 32GB 3GB RAM | 16 GB, 2 GB RAM |
| External memory | microSDXC (dedicated slot) | microSD, up to 256 GB (dedicated slot) |
| Display | HTC One M8 Prime | Oppo A3s |
| Type | Super LCD3 capacitive touchscreen, 16M colors | IPS LCD |
| Protection | Corning Gorilla Glass 3 | |
| Size | 5.5 inches, 83.4 cm2 | 6.2" inc |
| Resolution | 1440 x 2560 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 | HTC One M8 Prime | Oppo A3s |
| Camera | 4 MP, 1/3", 2?m, AF
4 MP, 1/3", 2?m, AF | |
| Features | Dual-LED dual-tone flash, panorama, HDR | |
| Video | 1080p@60fps, 720p@60fps, HDR, stereo sound rec. | |
| Selfie camera | HTC One M8 Prime | Oppo A3s |
| Camera | 5 MP | |
| Features | HDR | |
| Video | 1080p@30fps | |
| Connectivity | HTC One M8 Prime | Oppo A3s |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1900 / 2100 - EMEA, Asia | HSDPA 850 / 900 / 2100 |
| 4G Network | LTE band 3(1800), 7(2600), 8(900), 20(800) - EMEA | LTE |
| Wi-Fi | | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| CDMA | HSDPA 850 / 1900 / 2100 - AT&T | |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | 4.0, A2DP | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| Infrared port | Yes | |
| GPS | Yes, with A-GPS, GLONASS | Yes, with A-GPS |
| NFC | Yes (market/operator dependent) | |
| Speed | HSPA 42.2/21.1(AT&T)/5.76 Mbps, LTE Cat4 150/50 Mbps | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | microUSB 2.0 (MHL TV-out), 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, Wi-Fi Direct, DLNA, hotspot | |
| Camera | HTC One M8 Prime | 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 | HTC One M8 Prime | Oppo A3s |
| Loudspeaker | Yes, with stereo speakers | |
| 3.5 mm Jack | Yes | Yes |
| Radio | Stereo FM radio, RDS | FM radio |
| Design | HTC One M8 Prime | Oppo A3s |
| Colors | Gunmetal Gray, Glacial Silver, Amber Gold | Red, Dark Purple |
| Dimensions | - | 156.2 x 75.6 x 8.2 mm |
| SIM | Nano-SIM | |
| Weight | - | 168 g |
| Features | HTC One M8 Prime | Oppo A3s |
| Sensors | Accelerometer, gyro, proximity, compass, barometer | |
| Battery | HTC One M8 Prime | Oppo A3s |
| Capacity | Non-removable Li-Po battery | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | HTC One M8 Prime | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
