| Hardware and OS | Xiaomi Redmi S1 | Oppo A5s (AX5s) |
| Operating system | Android v8.0 (Oreo) | Android 8.1 (Oreo); ColorOS 5.2 |
| Processor | Octa core | Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53) |
| Chipset | | Mediatek MT6765 Helio P35 (12nm) |
| RAM | 2 GB | |
| GPU | | PowerVR GE8320 |
| Internal Storage | 16 GB | |
| Internal memory | | 32/64 GB, 2/3/4 GB RAM |
| Expandable memory | Yes Up to 128 GB | |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Custom UI | MIUI | |
| Display | Xiaomi Redmi S1 | Oppo A5s (AX5s) |
| Type | IPS LCD | S-IPS LCD |
| Size | 5.7 inches | 6.2" inc |
| Resolution | HD | 720 x 1520 px |
| Protection | | Corning Gorilla Glass 3 |
| Touchscreen | Yes Capacitive Touchscreen, Multi-touch | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.6% |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | 258 ppi | 271 PPI |
| Colors | | 16M |
| Connectivity | Xiaomi Redmi S1 | Oppo A5s (AX5s) |
| Network support | 4G , 3G, 2G | |
| Dual SIM | Dual SIM, GSM GSM | |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| SIM size | SIM1: Nano, SIM2: Nano (Hybrid) | |
| 3G Network | | HSDPA 850 / 900 / 1900 / 2100 |
| USB connectivity | Mass storage device, USB charging, microUSB 2.0 | |
| 4G Network | | LTE |
| Wi-Fi | Yes Wi-Fi 802.11, b/g/n | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | Yes v4.2 | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | Yes with A-GPS | Yes, with A-GPS, GLONASS, GALILEO, BDS |
| Speed | | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | | microUSB 2.0, USB On-The-Go |
| Camera | Xiaomi Redmi S1 | Oppo A5s (AX5s) |
| Image | 4128 x 3096 Pixels | |
| Camera features | Digital Zoom, Auto Flash, Face detection, Touch to focus | |
| Flash | Yes Dual-color LED Flash | |
| Autofocus | Yes Phase Detection autofocus | |
| Video recording | 1920x1080 @ 30 fps | |
| 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 | Xiaomi Redmi S1 | Oppo A5s (AX5s) |
| Audio jack | 3.5 mm | |
| Loudspeaker | Yes | |
| 3.5 mm Jack | | Yes |
| Radio | | FM radio |
| Design | Xiaomi Redmi S1 | Oppo A5s (AX5s) |
| Colors | | Red, Black, Gold, Green |
| Dimensions | | 155.9 x 75.4 x 8.2 mm |
| Weight | | 170 g |
| Battery | Xiaomi Redmi S1 | Oppo A5s (AX5s) |
| Capacity | 3000 mAh | |
| Type | Li-ion | |
| User replaceable | No | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | Xiaomi Redmi S1 | Oppo A5s (AX5s) |
| Fingerprint sensor | Yes | |
| Other sensors | Light sensor, Proximity sensor, Accelerometer, Compass, Gyroscope | |
| Release date | | 2019, March |
| Sensors | | Fingerprint (rear-mounted), accelerometer, proximity, compass |
