| Hardware and OS | Micromax A51 Bolt | Oppo A3s |
| Operating system | Android v2.3 (Gingerbread) | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | 832 MHz | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Broadcom BCM21552G | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | | Adreno 506 |
| RAM | 256 MB | |
| Internal memory | 512 MB | 16 GB, 2 GB RAM |
| External memory | | microSD, up to 256 GB (dedicated slot) |
| Expandable Memory | Yes, Up to 32 GB | |
| Display | Micromax A51 Bolt | Oppo A3s |
| Type | | IPS LCD |
| Screen Size | 3.5 inches (8.89 cm) | |
| Size | | 6.2" inc |
| Resolution | 320 x 480 pixels | 720 x 1520 px |
| Display Type | LCD | |
| Touchscreen | | capacitive touchscreen |
| Screen-to-Body Ratio | | 81.2% |
| Touch Screen | Yes, Capacitive Touchscreen | |
| Display area | | 95.9 cm2 |
| Display aspect ratio | | 19:9 (height:width) |
| Pixel Density | 165 ppi | 271 PPI |
| Colors | | 16M |
| Main Camera | Micromax A51 Bolt | Oppo A3s |
| Resolution | 2 MP Primary Camera
| |
| Flash | Yes, LED Flash | |
| Camera Features | Digital Zoom
Smile detection | |
| Camera Setup | Single | |
| Video Recording | 640x480 | |
| Connectivity | Micromax A51 Bolt | Oppo A3s |
| 2G Network | | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | | HSDPA 850 / 900 / 2100 |
| 4G Network | | LTE |
| Wi-Fi | Yes, Wi-Fi 802.11, b/g/n | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Network | 3G, 2G | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| Bluetooth | Yes, v3 | 4.2, A2DP, LE |
| Edge | | Yes |
| SIM 1 | 3G Speed: EV-DO category Rev.A GPRS: Available EDGE: Available | |
| GPRS | | Yes |
| GPS | | Yes, with A-GPS |
| Speed | | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | | microUSB 2.0, USB On-The-Go |
| Front Camera | Micromax A51 Bolt | Oppo A3s |
| Resolution | 0.3 MP Primary Camera
| |
| Camera Setup | Single | |
| Camera Features | Fixed Focus | |
| Camera | Micromax A51 Bolt | 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 | Micromax A51 Bolt | Oppo A3s |
| FM Radio | Yes | |
| 3.5 mm Jack | | Yes |
| Radio | | FM radio |
| Features | Micromax A51 Bolt | Oppo A3s |
| Other Sensors | Accelerometer | |
| Design | Micromax A51 Bolt | Oppo A3s |
| Colours | White/Black | |
| Colors | | Red, Dark Purple |
| Dimensions | | 156.2 x 75.6 x 8.2 mm |
| Weight | | 168 g |
| Battery | Micromax A51 Bolt | Oppo A3s |
| Type | Li-ion | |
| Capacity | 1500 mAh | |
| Standby time | Up to 140(2G) | |
| TalkTime | Up to 4.5(2G) | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | Micromax A51 Bolt | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
