Samsung Galaxy A51 vs Galaxy A21s
52
out of 100
VS
49
out of 100
Here we compared two smartphones: the 6.5-inch Samsung Galaxy A51 (with Exynos 9 Octa 9611) that was released on December 12, 2019, against the Samsung Galaxy A21s, which is powered by Exynos 850 and came out 5 months after. On this page, you will find tests, full specs, strengths, and weaknesses of each of the devices.
Key differences
Reasons to consider the Samsung Galaxy A51
- 50% higher pixel density (405 vs 270 PPI)
- Delivers 29% higher peak brightness (638 against 495 nits)
- Slow-motion recording at 960FPS
- 25% better performance in AnTuTu Benchmark (246K versus 197K)
- Ability to record video in 4K resolution
- More recent OS version: Android 13 versus 12
- Super AMOLED display (versus competitor''s PLS TFT)
- Faster storage type - UFS 2.0 versus eMMC 5.1
- Weighs 20 grams less
- The front-facing camera can record video at 4K
Reasons to consider the Samsung Galaxy A21s
- Comes with 1000 mAh larger battery capacity: 5000 vs 4000 mAh
- Shows 33% longer battery life (35:20 vs 26:33 hours)
- More energy-efficient CPU – Exynos 850
Review
Display
Screen quality, color accuracy, brightness
Camera
Photo and video recording quality
Performance
CPU and memory performance (apps, system)
Gaming
Capabilities for playing modern games
Battery
Battery life, charging type and speed
Connectivity
Networks, ports, data transmission
Value for money
Tests and specifications
Comparison table of technical specifications and testsDisplay
| Type | Super AMOLED | PLS TFT |
| Size | 6.5 inches | 6.5 inches |
| Resolution | 1080 x 2400 pixels | 720 x 1600 pixels |
| Aspect ratio | 20:9 | 20:9 |
| PPI | 405 ppi | 270 ppi |
| Refresh rate | 60 Hz | 60 Hz |
| Adaptive refresh rate | No | No |
| Max rated brightness | 400 nits | 540 nits |
| HDR support | No | No |
| Screen protection | Corning Gorilla Glass 3 | Tempered glass |
| Screen-to-body ratio | 87.4% | 82.8% |
| Display features | - Always-On Display | - |
| RGB color space | 98.8% | 88.4% |
| PWM | 242 Hz | 500 Hz |
| Response time | 25 ms | 30.4 ms |
| Contrast | ∞ Infinity | 1500:1 |
Peak brightness test (auto)
Design and build
| Height | 158.5 mm (6.24 inches) | 163.6 mm (6.44 inches) |
| Width | 73.6 mm (2.9 inches) | 75.3 mm (2.96 inches) |
| Thickness | 7.9 mm (0.31 inches) | 8.9 mm (0.35 inches) |
| Weight | 172 g (6.07 oz) | 192 g (6.77 oz) |
| Waterproof | No | No |
| Rear material | Plastic | Plastic |
| Frame material | Plastic | Plastic |
| Colors | White, Black | Black, Blue, Red |
| Fingerprint scanner | Yes, in-display | Yes, rear |
Screen-to-body ratio
Performance
| Chipset | Samsung Exynos 9 Octa 9611 | Samsung Exynos 850 |
| Max clock | 2300 MHz | 2000 MHz |
| CPU cores | 8 (4 + 4) | 8 (8) |
| Architecture |
- 4 cores at 1.7 GHz: Cortex-A53
- 4 cores at 2.3 GHz: Cortex-A73 |
- 8 cores at 2 GHz: Cortex-A55 |
| Lithography process | 10 nanometers | 8 nanometers |
| Graphics | Mali-G72 MP3 | Mali-G52 MP1 |
| GPU shading units | 54 | 24 |
| GPU clock | 850 MHz | 820 MHz |
| FLOPS | ~91.8 GFLOPS | ~39.4 GFLOPS |
Benchmarks
Geekbench 6 (Single-Core)
Geekbench 6 (Multi-Core)
AnTuTu Benchmark 10
| CPU | 69792 | 66646 |
| GPU | 55670 | 32355 |
| Memory | 60677 | 60940 |
| UX | 59872 | 36331 |
| Total score | 246594 | 197221 |
3DMark Wild Life Performance
| Max surface temperature | 42.2 °C | 43.2 °C |
| Stability | 95% | 98% |
| Graphics test | 4 FPS | 2 FPS |
| Graphics score | 812 | 425 |
PCMark 3.0
| Web score | - | 4688 |
| Video editing | - | 5134 |
| Photo editing | - | 9205 |
| Data manipulation | - | 3986 |
| Writing score | - | 5248 |
Memory
| RAM size | 4, 6 GB | 3, 4 GB |
| Memory type | LPDDR4X | LPDDR4X |
| Memory clock | 1866 MHz | 1866 MHz |
| Channels | 2 | 2 |
| Storage size | 64, 128 GB | 32, 64 GB |
| Storage type | UFS 2.0 | eMMC 5.1 |
| Memory card | MicroSD | MicroSD |
| Memory card max size | Up to 512 GB | Up to 512 GB |
Software
| Operating system | Android 10 (Can be upgraded to Android 13) | Android 10 (Can be upgraded to Android 12) |
| ROM | One UI 5.0 | One UI 4.1 |
| OS size | 23 GB | 12 GB |
Battery
| Capacity | 4000 mAh | 5000 mAh |
| Max charge power | 15 W | 15 W |
| Battery type | Li-Po | Li-Po |
| Replaceable | No | No |
| Wireless charging | No | No |
| Reverse charging | No | No |
| Fast charging | Yes (40% in 35 min) | Yes (50% in 60 min) |
| Full charging time | 1:50 hr | 2:10 hr |
| Web browsing | 09:34 hr | 12:44 hr |
| Watching video | 11:29 hr | 14:21 hr |
| Gaming | 05:12 hr | 05:37 hr |
| Standby | 83 hr | 120 hr |
General battery life
Camera
| Matrix | 48 megapixels | 48 megapixels |
| Image resolution | 8000 x 6000 | 8000 x 6000 |
| Zoom | Digital | Digital |
| Flash | LED | LED |
| Stabilization | Digital | Digital |
| 8K video recording | No | No |
| 4K video recording | Up to 30FPS | No |
| 1080p video recording | Up to 30FPS | Up to 30FPS |
| Slow motion | 960 FPS (720p) | No |
| Angle of widest lens | 120° | 123° |
| Lenses | 4 (48 MP + 12 MP + 5 MP + 5 MP) | 4 (48 MP + 8 MP + 2 MP + 2 MP) |
| Wide (main) lens |
- 48 MP
- Aperture: f/2.0 - Focal length: 26 mm - Pixel size: 0.8 micron - Sensor: 1/2", Sony IMX582 (Exmor-RS CMOS) - Phase autofocus |
- 48 MP
- Aperture: f/2.0 - Focal length: 26 mm - Pixel size: 0.8 micron - Sensor: 1/2.0" (CMOS) - Phase autofocus |
| Ultra-wide lens |
- 12 MP
- Aperture: f/2.2 - Focal length: 13 mm - Pixel size: 1.12 micron |
- 8 MP
- Aperture: f/2.2 - Pixel size: 1.12 micron - Sensor: 1/4.0" (CMOS) |
| Macro lens |
- 5 MP
- Aperture: f/2.4 - Focal length: 40 mm - Pixel size: 1.12 micron |
- 2 MP
- Aperture: f/2.4 |
| Depth lens |
- 5 MP
- Aperture: f/2.2 - Pixel size: 1.12 micron - Sensor: 1/5.0" (CMOS) |
- 2 MP
- Aperture: f/2.4 |
| Camera features |
- Bokeh mode
- Pro mode |
- Bokeh mode |
| Megapixels | 32 megapixels | 13 megapixels |
| Image resolution | 6560 x 4928 | 4128 x 3096 |
| Aperture | f/2.2 | f/2.2 |
| Focal length | 26 mm | - |
| Pixel size | 0.8 microns | 1.12 microns |
| Sensor type | ISOCELL CMOS | CMOS |
| Sensor size | 1/2.8" | 1/3.1" |
| Video resolution | 2160p (4K) at 30 FPS | 1080p (Full HD) at 30 FPS |
Connectivity
| Wi-Fi standard | Wi-Fi 5 (802.11 b/g/n/ac) | Wi-Fi 5 (802.11 a/b/g/n/ac) |
| Wi-Fi features |
- Dual Band
- Wi-Fi Direct - Wi-Fi Hotspot - Wi-Fi Display |
- Dual Band
- Wi-Fi Direct - Wi-Fi Hotspot - Wi-Fi Display |
| Bluetooth version | 5 | 5 |
| Bluetooth features | PBAP/PAB, PAN, OPP, MAP, HSP, HID, HFP, DIP, AVRCP, A2DP | PBAP/PAB, PAN, OPP, MAP, HSP, HID, HFP, DIP, AVRCP, A2DP |
| USB type | USB Type-C | USB Type-C |
| USB version | 2 | 2 |
| USB features |
- Charging
- USB-Storage mode - OTG |
- Charging
- USB-Storage mode - OTG |
| GPS | GPS, GLONASS, Beidou, Galileo | GPS, GLONASS, Beidou, Galileo |
| NFC * | Yes | Yes |
| Infrared port | No | No |
| Number of SIM * | 2 | 2 |
| Type of SIM card | Nano | Nano |
| Multi SIM mode | Standby | Standby |
| eSIM support * | No | No |
| Hybrid slot | No | No |
| LTE Cat * | 12 | 13 |
| 5G support | No | No |
Sound
| Speakers | Mono | Mono |
| Headphone audio jack | Yes | Yes |
| FM radio | Yes | Yes |
| Dolby Atmos | Yes | Yes |
Speakers test
Max loudness
Other
| Category | Mid-range | Budget |
| Announced | December 2019 | May 2020 |
| Release date | December 2019 | June 2020 |
| SAR (head) | 0.596 W/kg | 0.23 W/kg |
| SAR (body) | 1.45 W/kg | 1.38 W/kg |
| Sensors |
- Proximity sensor
- Gyroscope - Accelerometer - Ambient light sensor - Compass - Fingerprint |
- Hall-effect sensor
- Proximity sensor - Gyroscope - Accelerometer - Ambient light sensor - Compass - Fingerprint |
*
Disclaimer!
NFC, GSM network support, and some other specs can be different depending on the country.
Conclusion
If the display, camera, performance, gaming, software, and design are more important to you, then choose the Samsung Galaxy A51 . But if the battery life is more of a priority – go for the Samsung Galaxy A21s .
