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| ratings | ||||
| Overall NDTV Rating | Read Review | - | - | |
| Design Rating | - | - | ||
| Display Rating | - | - | ||
| Software Rating | - | - | ||
| Performance Rating | - | - | ||
| Battery Life Rating | - | - | ||
| Camera Rating | - | - | ||
| Value for Money Rating | - | - | ||
| key specs | ||||
| Display | 6.20-inch | 6.41-inch | 6.30-inch | |
| Front Camera | 16-megapixel | 24.8-megapixel | 8-megapixel | |
| Rear Camera | 13-megapixel + 2-megapixel | 12-megapixel + 5-megapixel | 16-megapixel | |
| RAM | 4GB | 6GB | 4GB | |
| Storage | 64GB | 128GB | 128GB | |
| Battery Capacity | 4230mAh | 3400mAh | - | |
| OS | Android 8.1 | Android 8.1 Oreo | Android Oreo | |
| Processor | - | Qualcomm Snapdragon 660 | MediaTek Helio P60 | |
| Resolution | - | 1080x2340 pixels | - | |
| general | ||||
| Brand | Oppo | Vivo | Oppo | |
| Model | A7 | X21s | A7X | |
| Release date | November 1, 2018 | November 1, 2018 | September 1, 2018 | |
| Launched in India | Yes | - | No | |
| Form factor | Touchscreen | Touchscreen | Touchscreen | |
| Body type | Plastic | - | - | |
| Dimensions (mm) | 155.90 x 75.40 x 8.10 | 157.91 x 75.08 x 7.90 | - | |
| Weight (g) | 168.00 | 156.00 | - | |
| Battery capacity (mAh) | 4230 | 3400 | - | |
| Removable battery | No | - | - | |
| Colours | Glaring Gold, Glaze Blue | Starry Night Black | Star Purple, Ice Flame Blue | |
| SAR value | 1.37 | - | - | |
| display | ||||
| Screen size (inches) | 6.20 | 6.41 | 6.30 | |
| Touchscreen | Yes | Yes | Yes | |
| Aspect ratio | 19.5:9 | 19.5:9 | 19.5:9 | |
| Resolution | - | 1080x2340 pixels | - | |
| hardware | ||||
| Processor make | Qualcomm Snapdragon 450 | Qualcomm Snapdragon 660 | MediaTek Helio P60 (MT6771) | |
| RAM | 4GB | 6GB | 4GB | |
| Internal storage | 64GB | 128GB | 128GB | |
| Expandable storage | Yes | Yes | Yes | |
| Expandable storage type | microSD | microSD | - | |
| Expandable storage up to (GB) | 256 | 256 | - | |
| Dedicated microSD slot | Yes | - | - | |
| Processor | - | octa-core | 2GHz octa-core | |
| camera | ||||
| Rear camera | 13-megapixel (f/2.2) + 2-megapixel (f/2.4) | 12-megapixel + 5-megapixel | 16-megapixel | |
| Rear autofocus | Yes | Yes | - | |
| Rear flash | Yes | - | Yes | |
| Front camera | 16-megapixel | 24.8-megapixel | 8-megapixel | |
| Front autofocus | No | - | - | |
| Front flash | No | - | - | |
| software | ||||
| Operating system | Android 8.1 | Android 8.1 Oreo | Android Oreo | |
| Skin | ColorOS 5.2 | - | Color OS 5.2 | |
| connectivity | ||||
| Wi-Fi | Yes | Yes | Yes | |
| Wi-Fi standards supported | 802.11 a/b/g/n | - | 802.11 a/b/g/n/ac | |
| GPS | Yes | Yes | Yes | |
| Bluetooth | Yes, v 4.20 | Yes | - | |
| USB OTG | Yes | - | - | |
| Micro-USB | Yes | Yes | Yes | |
| Headphones | 3.5mm | 3.5mm | - | |
| FM | Yes | - | - | |
| Number of SIMs | 2 | 2 | - | |
| Active 4G on both SIM cards | Yes | - | - | |
| sim 1 | ||||
| GSM/CDMA | GSM | GSM | - | |
| 3G | Yes | Yes | - | |
| 4G/ LTE | Yes | Yes | - | |
| sim 2 | ||||
| GSM/CDMA | GSM | GSM | - | |
| 3G | Yes | Yes | - | |
| 4G/ LTE | Yes | Yes | - | |
| sensors | ||||
| Face unlock | Yes | Yes | - | |
| Fingerprint sensor | Yes | Yes | Yes | |
| Compass/ Magnetometer | Yes | Yes | Yes | |
| Proximity sensor | Yes | Yes | Yes | |
| Accelerometer | Yes | Yes | Yes | |
| Ambient light sensor | Yes | Yes | Yes | |
| Gyroscope | Yes | Yes | - | |
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