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- J9 vs A31
Cubot J9 vs OPPO A31
What J9 does better (2) and where A31 wins (12) — every spec side by side.
Dimensions
Size comparison
J9A31
| J9 | A31 | Difference | |
|---|---|---|---|
| Height | 156.2 mm | 163.9 mm | −7.7 mm |
| Width | 74.6 mm | 75.5 mm | −0.9 mm |
| Thickness | 9.4 mm | 8.3 mm | +1.1 mm |
| Weight | 185 g | 180 g | +5 g |
Drawn to the same scale from the official dimensions (front and side).
Why is J9 better than A31?
- Rear cameras3 vs 13×
- Main camera13 MP vs 12 MP+8%
Why is A31 better than J9?
- RAM2 GB vs 6 GB3×
- Storage (max)16 GB vs 128 GB8×
- CPU frequency1.3 GHz vs 2.3 GHz+77%
- Storage (base)16 GB vs 64 GB4×
- Process28 nm vs 12 nm2.3×
- CPU cores4 vs 82×
- Memory card slotNo · J9: Yes
- Screen size6.2″ vs 6.5″+5%
- Weight185 g vs 180 g+3%
- Wi-Fi standardWi-Fi 4 vs Wi-Fi 5+25%
- Bluetooth4 vs 5+25%
- Thickness9.4 mm vs 8.3 mm+13%
Specifications
Side by side
| Design | ||
| Weight | 185 g | 180 g |
| Thickness | 9.4 mm | 8.3 mm |
| Height | 156.2 mm | 163.9 mm |
| Width | 74.6 mm | 75.5 mm |
| Frame | — | Plastic |
| Back | — | Plastic |
| Glass protection | — | Corning Gorilla Glass 3 |
| Colours | Blue, Black, Green | Fantasy White, Mystery Black, Lake Green |
| Display | ||
| Screen size | 6.2″ | 6.5″ |
| Panel | IPS LCD | IPS LCD |
| OLED panel | No | No |
| Resolution (width) | 720 px | 720 px |
| Resolution (height) | 1,520 px | 1,600 px |
| Pixel density | 271 ppi | 270 ppi |
| Refresh rate | 60 Hz | 60 Hz |
| Peak brightness | — | 480 nits |
| Screen-to-body ratio | 82.3% | 82.4% |
| Performance | ||
| Chipset | Mediatek MT6580 | Mediatek MT6765V/CB Helio P35 |
| Chip maker | MediaTek | MediaTek |
| Process | 28 nm | 12 nm |
| CPU cores | 4 | 8 |
| CPU frequency | 1.3 GHz | 2.3 GHz |
| GPU | — | PowerVR GE8320 |
| Memory | ||
| RAM | 2 GB | 6 GB |
| Storage (max) | 16 GB | 128 GB |
| Storage (base) | 16 GB | 64 GB |
| Storage type | — | eMMC 5.1 |
| Memory card slot | No | Yes |
| Camera | ||
| Main camera | 13 MP | 12 MP |
| Main camera aperture | — | f/1.8 |
| Main sensor size | — | 1/2.86" |
| Rear cameras | 3 | 1 |
| Optical stabilisation | No | No |
| Ultra-wide camera | No | No |
| Telephoto camera | No | No |
| Max video | — | 1080p |
| Selfie camera | 8 MP | 8 MP |
| 4K selfie video | No | No |
| Battery | ||
| Battery capacity | 4,200 mAh | 4,230 mAh |
| Battery type | — | Li-Po |
| Wireless charging | — | No |
| Connectivity | ||
| 5G | — | No |
| eSIM | No | No |
| Dual SIM | Yes | Yes |
| Wi-Fi standard | Wi-Fi 4 | Wi-Fi 5 |
| Bluetooth | 4 | 5 |
| NFC | No | No |
| USB | USB Type-C | microUSB 2.0 |
| Satellite navigation | — | GLONASS, BDS |
| Features | ||
| Stereo speakers | No | No |
| 3.5 mm headphone jack | Yes | Yes |
| Fingerprint sensor | — | Rear |
| Sensors | Accelerometer, proximity | Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass |
| Software | ||
| OS at launch | Android 10 | Android 9.0 (Pie) |
| Platform | Android | Android |
| Interface | — | ColorOS 6.1 |
