| Hardware and OS | HTC Nexus 9 | Oppo A3s |
| Operating system | Android 5.0 (Lollipop), upgradable to 7.1.1 (Nougat) | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Dual-core 2.3 GHz Denver | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Nvidia Tegra K1 | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | Kepler DX1 | Adreno 506 |
| Internal memory | 16GB (Wi-Fi)/ 32GB (LTE), 2GB RAM | 16 GB, 2 GB RAM |
| External memory | No | microSD, up to 256 GB (dedicated slot) |
| Display | HTC Nexus 9 | Oppo A3s |
| Type | IPS LCD | IPS LCD |
| Size | 8.9 inches, 257.7 cm2 | 6.2" inc |
| Resolution | 1536 x 2048 pixels, 4:3 ratio | 720 x 1520 px |
| Touchscreen | | capacitive touchscreen |
| Protection | Corning Gorilla Glass 3 | |
| 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 Nexus 9 | Oppo A3s |
| Camera | 8 MP, AF | |
| Features | LED flash | |
| Video | 1080p@30fps, stereo sound rec. | |
| Selfie camera | HTC Nexus 9 | Oppo A3s |
| Camera | 1.6 MP | |
| Video | 720p | |
| Connectivity | HTC Nexus 9 | Oppo A3s |
| 2G Network | GSM 850 / 900 / 1800 / 1900 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 850 / 900 / 1700 / 1900 / 2100 | HSDPA 850 / 900 / 2100 |
| 4G Network | 1, 2, 3, 4, 5, 7, 8, 20 | 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 | 2, 3, 5, 6, 13 - T-Mobile | |
| Edge | | Yes |
| GPRS | | Yes |
| NFC | Yes | |
| GPS | Yes, with A-GPS, GLONASS | Yes, with A-GPS |
| Speed | HSPA 42.2/5.76 Mbps, LTE Cat4 150/50 Mbps | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| Technology | GSM / HSPA / LTE | |
| USB | microUSB 2.0 | microUSB 2.0, USB On-The-Go |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct, DLNA, hotspot | |
| Camera | HTC Nexus 9 | 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 Nexus 9 | Oppo A3s |
| Loudspeaker | Yes, with stereo speakers | |
| 3.5 mm Jack | Yes | Yes |
| Radio | No | FM radio |
| Design | HTC Nexus 9 | Oppo A3s |
| Colors | Indigo Black, Lunar White, Sand | Red, Dark Purple |
| Dimensions | 228.2 x 153.7 x 8 mm (8.98 x 6.05 x 0.31 in) | 156.2 x 75.6 x 8.2 mm |
| Weight | 425 g (Wi-Fi) / 436 g (3G/LTE) (14.99 oz) | 168 g |
| SIM | Nano-SIM | |
| Battery | HTC Nexus 9 | Oppo A3s |
| Type | Li-Po 6700 mAh, non-removable | |
| Stand-by | Up to 720 h (3G) | |
| Talk time | Up to 9 h 30 min (multimedia) (3G) | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Features | HTC Nexus 9 | Oppo A3s |
| Sensors | Accelerometer, gyro, compass | |
| Other | HTC Nexus 9 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
