| BLU S91 Pro |
Oppo A3s |
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| Hardware and OS | BLU S91 Pro | Oppo A3s |
| Operating system | Android 12 | Android 8.1 (Oreo); ColorOS 5.1 |
| Processor | Octa-core (4x2.3 GHz Cortex-A53 & 4x1.8 GHz Cortex-A53) | Octa-core 1.8 GHz Cortex-A53 |
| Chipset | Mediatek MT6765V/CB Helio G37 (12 nm) | Qualcomm SDM450 Snapdragon 450 (14 nm) |
| GPU | PowerVR GE8320 | Adreno 506 |
| Internal memory | 128GB 4GB RAM | 16 GB, 2 GB RAM |
| External memory | microSDXC | microSD, up to 256 GB (dedicated slot) |
| Display | BLU S91 Pro | Oppo A3s |
| Type | IPS LCD | IPS LCD |
| Size | 6.5 inches, 102.0 cm2(~81.5% screen-to-body ratio) | 6.2" inc |
| Resolution | 720 x 1600 pixels, 20:9 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 | |
| Connectivity | BLU S91 Pro | Oppo A3s |
| WLAN | Wi-Fi 802.11 a/b/g/n/ac, Wi-Fi Direct, hotspot | |
| 2G Network | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 | GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 |
| NFC | No | |
| 3G Network | HSDPA 850 / 900 / 1700 / 1900 / 2100 | HSDPA 850 / 900 / 2100 |
| 4G Network | 1, 2, 3, 4, 5, 7, 12, 13, 17, 28, 66 | LTE |
| Wi-Fi | Wi-Fi 802.11 b/g/n, WiFi Direct, hotspot | |
| Technology | GSM / HSPA / LTE | |
| Network | GSM / HSPA / LTE | |
| SIM card | Dual SIM (Nano-SIM, dual stand-by) | |
| Bluetooth | 5.0, A2DP, LE | 4.2, A2DP, LE |
| Edge | Yes | |
| GPRS | Yes | |
| GPS | Yes, with A-GPS | Yes, with A-GPS |
| Speed | HSPA 42.2/5.76 Mbps, LTE | HSPA 42.2/5.76 Mbps, LTE-A (2CA) Cat6 300/50 Mbps |
| USB | USB Type-C 2.0, USB On-The-Go | microUSB 2.0, USB On-The-Go |
| Main Camera | BLU S91 Pro | Oppo A3s |
| Camera | 50 MP, f/1.8 (wide), 0.7µm, PDAF 2 MP, f/2.4, 115? (ultrawide) 0.8 MP, f/2.4, (depth) | |
| Features | Dual-LED flash, HDR, panorama | |
| Video | 1080p@30fps | |
| Selfie camera | BLU S91 Pro | Oppo A3s |
| Camera | 13 MP | |
| Video | 1080p@30fps | |
| Camera | BLU S91 Pro | 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 | BLU S91 Pro | Oppo A3s |
| Loudspeaker | Yes | |
| 3.5 mm Jack | Yes | Yes |
| Radio | FM radio | |
| Features | BLU S91 Pro | Oppo A3s |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass | |
| Design | BLU S91 Pro | Oppo A3s |
| SIM | Dual SIM (Nano-SIM, dual stand-by) | |
| Colors | Black, Mint Green | Red, Dark Purple |
| Dimensions | 164.7 x 76 x 8.9 mm (6.48 x 2.99 x 0.35 in) | 156.2 x 75.6 x 8.2 mm |
| Weight | 202 g (7.13 oz) | 168 g |
| Battery | BLU S91 Pro | Oppo A3s |
| Type | Li-Po 5000 mAh, non-removable | |
| Battery capacity | 4230 mAh, Non-removable Li-Ion | |
| Other | BLU S91 Pro | Oppo A3s |
| Release date | 2018, July | |
| Sensors | Accelerometer, proximity, compass |
