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- Smart HD 2021 vs A31
Infinix Smart HD 2021 vs OPPO A31
What Smart HD 2021 does better (3) and where A31 wins (13) — every spec side by side.
vs
2.9Display2.9
2.3Camera3.2
5.6Battery2.9
2.4Features3.5
Dimensions
Size comparison
Smart HD 2021A31
| Smart HD 2021 | A31 | Difference | |
|---|---|---|---|
| Height | 158.3 mm | 163.9 mm | −5.6 mm |
| Width | 75.2 mm | 75.5 mm | −0.3 mm |
| Thickness | 9.8 mm | 8.3 mm | +1.5 mm |
| Weight | 195 g | 180 g | +15 g |
Drawn to the same scale from the official dimensions (front and side).
Why is Smart HD 2021 better than A31?
- Battery capacity5,000 mAh vs 4,230 mAh+18%
- Pixel density282 ppi vs 270 ppi+4%
- Peak brightness500 nits vs 480 nits+4%
Why is A31 better than Smart HD 2021?
- RAM2 GB vs 6 GB3×
- Storage (max)32 GB vs 128 GB4×
- Main camera8 MP vs 12 MP+50%
- CPU frequency1.8 GHz vs 2.3 GHz+28%
- CPU cores4 vs 82×
- Storage (base)32 GB vs 64 GB2×
- Weight195 g vs 180 g+8%
- Screen size6.1″ vs 6.5″+7%
- Selfie camera5 MP vs 8 MP+60%
- Wi-Fi standardWi-Fi 4 vs Wi-Fi 5+25%
- Thickness9.8 mm vs 8.3 mm+18%
- Main camera aperturef/2 vs f/1.8+11%
Specifications
Side by side
| Design | ||
| Weight | 195 g | 180 g |
| Thickness | 9.8 mm | 8.3 mm |
| Height | 158.3 mm | 163.9 mm |
| Width | 75.2 mm | 75.5 mm |
| Frame | Plastic | Plastic |
| Back | Plastic | Plastic |
| Glass protection | — | Corning Gorilla Glass 3 |
| Colours | Topaz Blue, Obsidian Black, Quartz Green | Fantasy White, Mystery Black, Lake Green |
| Display | ||
| Screen size | 6.1″ | 6.5″ |
| Panel | IPS LCD | IPS LCD |
| OLED panel | No | No |
| Resolution (width) | 720 px | 720 px |
| Resolution (height) | 1,560 px | 1,600 px |
| Pixel density | 282 ppi | 270 ppi |
| Refresh rate | 60 Hz | 60 Hz |
| Peak brightness | 500 nits | 480 nits |
| Screen-to-body ratio | 76.7% | 82.4% |
| Performance | ||
| Chipset | Mediatek MT6761D Helio A20 | Mediatek MT6765V/CB Helio P35 |
| Chip maker | MediaTek | MediaTek |
| Process | 12 nm | 12 nm |
| CPU cores | 4 | 8 |
| CPU frequency | 1.8 GHz | 2.3 GHz |
| GPU | PowerVR GE8320 | PowerVR GE8320 |
| Memory | ||
| RAM | 2 GB | 6 GB |
| Storage (max) | 32 GB | 128 GB |
| Storage (base) | 32 GB | 64 GB |
| Storage type | eMMC 5.1 | eMMC 5.1 |
| Memory card slot | Yes | Yes |
| Camera | ||
| Main camera | 8 MP | 12 MP |
| Main camera aperture | f/2 | f/1.8 |
| Main sensor size | — | 1/2.86" |
| Rear cameras | 1 | 1 |
| Optical stabilisation | No | No |
| Ultra-wide camera | No | No |
| Telephoto camera | No | No |
| Max video | 1080p | 1080p |
| Selfie camera | 5 MP | 8 MP |
| 4K selfie video | No | No |
| Battery | ||
| Battery capacity | 5,000 mAh | 4,230 mAh |
| Battery type | — | Li-Po |
| Wireless charging | No | No |
| Connectivity | ||
| 5G | No | No |
| eSIM | No | No |
| Dual SIM | Yes | Yes |
| Wi-Fi standard | Wi-Fi 4 | Wi-Fi 5 |
| Bluetooth | 5 | 5 |
| NFC | No | No |
| USB | microUSB 2.0 | microUSB 2.0 |
| Satellite navigation | — | GLONASS, BDS |
| Features | ||
| Stereo speakers | No | No |
| 3.5 mm headphone jack | Yes | Yes |
| Fingerprint sensor | Rear | Rear |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity | Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass |
| SAR (head) | 0.53 W/kg | — |
| Software | ||
| OS at launch | Android 10 (Go edition) | Android 9.0 (Pie) |
| Platform | Android | Android |
| Interface | XOS 6.2 | ColorOS 6.1 |
