| Hardware and OS | HTC One M9 Supreme Camera | Oppo A3s |
| Operating system | Android 5.2 (Lollipop); Sense UI 7 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-core 2.2 GHz Cortex-A53 | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Mediatek MT6795T Helio X10 (28 nm) | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | PowerVR G6200 | Adreno 506 |
| Internal memory | 32GB 3GB RAM | 16 GB, 2 GB RAM |
| External memory | microSDXC (dedicated slot) | microSD, up to 256 GB (dedicated slot) |
| Display | HTC One M9 Supreme Camera | Oppo A3s |
| Type | Super LCD3 capacitive touchscreen, 16M colors | IPS LCD |
| Size | 5.2 inches, 74.5 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 M9 Supreme Camera | Oppo A3s |
| Camera | 21 MP, f/2.2, 27mm (wide), Laser AF, OIS | |
| Features | Dual-LED dual-tone flash, HDR, panorama | |
| Video | 2160p@30fps, 1080p@60fps, 720p@120fps, HDR, stereo sound rec. | |
| Selfie camera | HTC One M9 Supreme Camera | Oppo A3s |
| Camera | 4 MP, f/2.0, 27mm (wide), 1/3", 2?m | |
| Features | HDR | |
| Video | 1080p@30fps | |
| Connectivity | HTC One M9 Supreme Camera | 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 | HSDPA 850 / 900 / 2100 |
| 4G Network | LTE band 1(2100), 3(1800), 5(850), 7(2600), 8(900), 28(700), 38(2600), 39(1900), 40(2300), 41(2500) | 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) |
| Bluetooth | 4.1, A2DP, aptX | 4.2, A2DP, LE |
| CDMA | TD-SCDMA | |
| Edge | | Yes |
| GPRS | | Yes |
| Infrared port | Yes | |
| GPS | Yes, with A-GPS, GLONASS, BDS | Yes, with A-GPS |
| NFC | Yes (market/operator dependent) | |
| Speed | HSPA 42.2/21.1 Mbps, LTE-A (2CA) Cat6 300/50 Mbps | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | microUSB 2.0 (MHL 2 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, dual-band, Wi-Fi Direct, DLNA, hotspot | |
| Camera | HTC One M9 Supreme Camera | 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 M9 Supreme Camera | Oppo A3s |
| Loudspeaker | Yes, with stereo speakers | |
| 3.5 mm Jack | Yes | Yes |
| Radio | Stereo FM radio, RDS | FM radio |
| Design | HTC One M9 Supreme Camera | Oppo A3s |
| Colors | Gunmetal Gray, Silver Gold, Amber Gold | Red, Dark Purple |
| Dimensions | 151 x 72 x 9.6 mm (5.94 x 2.83 x 0.38 in) | 156.2 x 75.6 x 8.2 mm |
| Weight | 168 g (5.93 oz) | 168 g |
| SIM | Nano-SIM | |
| Battery | HTC One M9 Supreme Camera | Oppo A3s |
| Capacity | Non-removable Li-Po 2840 mAh battery | |
| Stand-by | Up to 598 h (2G) / Up to 626 h (3G) | |
| Talk time | Up to 23 h (2G) / Up to 13 h (3G) | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Features | HTC One M9 Supreme Camera | Oppo A3s |
| Sensors | Fingerprint (front-mounted), accelerometer, gyro, proximity, compass | |
| Other | HTC One M9 Supreme Camera | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
