| Hardware and OS | Karbonn A37 | Oppo A3s |
| Operating system | Android 4.1 (Ice Cream Sandwich) | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Dual-core 1.0 GHz | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | | Adreno 506 |
| Internal memory | 4GB 512MB RAM | 16 GB, 2 GB RAM |
| External memory | microSDHC (dedicated slot) | microSD, up to 256 GB (dedicated slot) |
| Display | Karbonn A37 | Oppo A3s |
| Type | TFT | IPS LCD |
| Size | 7.0 inches, 139.5 cm2 | 6.2" inc |
| Resolution | 480 x 800 pixels, 5:3 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 | Karbonn A37 | Oppo A3s |
| Camera | 2 MP | |
| Video | Yes | |
| Selfie camera | Karbonn A37 | Oppo A3s |
| Camera | Yes | |
| Connectivity | Karbonn A37 | Oppo A3s |
| 2G Network | GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| 3G Network | HSDPA 2100 | HSDPA 850 / 900 / 2100 |
| NFC | No | |
| 4G Network | | LTE |
| Wi-Fi | | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot |
| Technology | GSM / HSPA | |
| Network | | GSM / HSPA / LTE |
| SIM card | | Dual SIM (Nano-SIM, dual stand-by) |
| WLAN | Wi-Fi 802.11 b/g/n, hotspot | |
| Bluetooth | Yes | 4.2, A2DP, LE |
| Edge | | Yes |
| GPRS | | Yes |
| GPS | Yes, with A-GPS | Yes, with A-GPS |
| Speed | HSPA 7.2/0.384 Mbps | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | Proprietary | microUSB 2.0, USB On-The-Go |
| Camera | Karbonn A37 | 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 | Karbonn A37 | Oppo A3s |
| Loudspeaker | Yes | |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | FM radio |
| Features | Karbonn A37 | Oppo A3s |
| Sensors | Accelerometer | |
| Design | Karbonn A37 | Oppo A3s |
| SIM | Dual SIM | |
| Colors | Black/White | Red, Dark Purple |
| Dimensions | 197 x 124 x 12.3 mm (7.76 x 4.88 x 0.48 in) | 156.2 x 75.6 x 8.2 mm |
| Weight | 335 g (11.82 oz) | 168 g |
| Battery | Karbonn A37 | Oppo A3s |
| Type | Li-Ion 3000 mAh battery | |
| Stand-by | Up to 240 h | |
| Talk time | Up to 8 h | |
| Battery capacity | | 4230 mAh, Non-removable Li-Ion |
| Other | Karbonn A37 | Oppo A3s |
| Release date | | 2018, July |
| Sensors | | Accelerometer, proximity, compass |
