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- K51S vs Galaxy M21
LG K51S vs Samsung Galaxy M21
What K51S does better (2) and where Galaxy M21 wins (13) — every spec side by side.
vs
3.8Display5.0
5.7Camera6.7
5.6Features5.0
Dimensions
Size comparison
K51SGalaxy M21
| K51S | Galaxy M21 | Difference | |
|---|---|---|---|
| Height | 165.2 mm | 159 mm | +6.2 mm |
| Width | 76.7 mm | 75.1 mm | +1.6 mm |
| Thickness | 8.3 mm | 8.9 mm | −0.6 mm |
| Weight | 194 g | 188 g | +6 g |
Drawn to the same scale from the official dimensions (front and side).
Why is K51S better than Galaxy M21?
- Screen size6.6″ vs 6.4″+2%
- Thickness8.3 mm vs 8.9 mm+7%
Why is Galaxy M21 better than K51S?
- RAM3 GB vs 6 GB2×
- Battery capacity4,000 mAh vs 6,000 mAh+50%
- Main camera32 MP vs 48 MP+50%
- OLED panelNo · K51S: Yes
- Storage (max)64 GB vs 128 GB2×
- Pixel density282 ppi vs 403 ppi+43%
- Max video1080p vs 4K
- Weight194 g vs 188 g+3%
- Selfie camera13 MP vs 20 MP+54%
- Resolution (width)720 px vs 1,080 px+50%
- Wi-Fi standardWi-Fi 4 vs Wi-Fi 5+25%
- Process12 nm vs 10 nm+20%
Specifications
Side by side
| Design | ||
| Weight | 194 g | 188 g |
| Thickness | 8.3 mm | 8.9 mm |
| Height | 165.2 mm | 159 mm |
| Width | 76.7 mm | 75.1 mm |
| Frame | — | Plastic |
| Back | — | Plastic |
| Glass protection | Scratch-resistant glass | Corning Gorilla Glass 3 |
| Colours | Titanium, Pink, Blue, Red | Midnight Blue, Raven Black |
| Display | ||
| Screen size | 6.6″ | 6.4″ |
| Panel | IPS LCD | Super AMOLED |
| OLED panel | No | Yes |
| Resolution (width) | 720 px | 1,080 px |
| Resolution (height) | 1,600 px | 2,340 px |
| Pixel density | 282 ppi | 403 ppi |
| Refresh rate | 60 Hz | 60 Hz |
| Peak brightness | — | 420 nits |
| Measured brightness | — | 608 nits |
| Screen-to-body ratio | 73.8% | 84.2% |
| Performance | ||
| Chipset | Mediatek MT6765 Helio P35 | Exynos 9611 |
| Chip maker | MediaTek | Exynos |
| Process | 12 nm | 10 nm |
| CPU cores | 8 | 8 |
| CPU frequency | 2.3 GHz | 2.3 GHz |
| GPU | PowerVR GE8320 | Mali-G72 MP3 |
| AnTuTu score | — | 355,351 |
| Geekbench 6 (multi-core) | — | 1,139 |
| Memory | ||
| RAM | 3 GB | 6 GB |
| Storage (max) | 64 GB | 128 GB |
| Storage (base) | 64 GB | 64 GB |
| Storage type | eMMC 5.1 | UFS 2.1 |
| Memory card slot | Yes | Yes |
| Camera | ||
| Main camera | 32 MP | 48 MP |
| Main camera aperture | — | f/2 |
| Main sensor size | — | 1/2.0" |
| Rear cameras | 2 | 2 |
| Optical stabilisation | No | No |
| Ultra-wide camera | Yes | Yes |
| Telephoto camera | No | No |
| Max video | 1080p | 4K |
| 4K video frame rate | — | 30 fps |
| Selfie camera | 13 MP | 20 MP |
| 4K selfie video | No | No |
| Battery | ||
| Battery capacity | 4,000 mAh | 6,000 mAh |
| Battery type | Li-Po | Li-Po |
| Wired charging | — | 15 W |
| Charged in 30 min | — | 25% |
| Wireless charging | — | No |
| Connectivity | ||
| 5G | — | No |
| eSIM | No | No |
| Dual SIM | Yes | Yes |
| Wi-Fi standard | Wi-Fi 4 | Wi-Fi 5 |
| Bluetooth | 5 | 5 |
| NFC | Yes | Yes |
| USB | USB Type-C 2.0 | USB Type-C 2.0 |
| USB version | 2 | 2 |
| Satellite navigation | — | GLONASS, GALILEO, BDS |
| Features | ||
| Stereo speakers | No | No |
| 3.5 mm headphone jack | Yes | Yes |
| Fingerprint sensor | Rear | Rear |
| Sensors | Fingerprint (rear-mounted), accelerometer, proximity, compass | Fingerprint (rear-mounted), accelerometer, gyro, proximity, compass |
| SAR (head) | — | 0.47 W/kg |
| Software | ||
| OS at launch | Android 9.0 (Pie) | Android 10 |
| Platform | Android | Android |
| Interface | — | One UI 3.1 Core |
