42points
Samsung Galaxy A21s
58points
Samsung Galaxy A51
vs
vs
245 facts in comparison
Samsung Galaxy A21s vs Samsung Galaxy A51
Samsung Galaxy A21s
Samsung Galaxy A51
Why is Samsung Galaxy A21s better than Samsung Galaxy A51?
- 25% more battery power?
5000mAhvs4000mAh - 2nm smaller semiconductor size?
8nmvs10nm - Has a CMOS sensor?
- 1W lower TDP?
7Wvs8W
Why is Samsung Galaxy A51 better than Samsung Galaxy A21s?
- 1.5x higher pixel density?
405ppivs270ppi - 2GB more RAM memory?
8GBvs6GB - 2.25x higher resolution?
1080 x 2400pxvs720 x 1600px - 16.67% more megapixels (main camera)?
48MP & 12MP & 5MP & 5MPvs48MP & 8MP & 2MP & 2MP - Has branded damage-resistant glass?
- 2.46x more megapixels (front camera)?
32MPvs13MP - 128GB more internal storage?
256GBvs128GB - 2x better video recording quality (main camera)?
2160 x 30fpsvs1080 x 30fps
Price comparison
Samsung Galaxy A21s
Buy used:
$65
| Product | Store | Price | |
|---|---|---|---|
| Samsung Galaxy A21s DS 64 GB 3GB RAM 6....Samsung Galaxy A21s DS 64 GB 3GB RAM 6.5" 48MP Unlocked SmartPhone very clean | $120 | ||
| Samsung Galaxy A21S SM-A217F/DSN (Blue 3...Samsung Galaxy A21S SM-A217F/DSN (Blue 32GB) Tim Mobile Dual Sim | $100 | ||
| Samsung Galaxy A21S SM-A217F/DSN (Blue 3...Samsung Galaxy A21S SM-A217F/DSN (Blue 32GB) EE Dual Sim CRACKED GLAS | $65 | ||
| OPEN BOX Samsung Galaxy A21s A217F/DS Du...OPEN BOX Samsung Galaxy A21s A217F/DS Dual SIM 64GB FACTORY UNLOCKED Smartphone | $161 | ||
| Global Samsung Galaxy A21s A217F 5.1" Un...Global Samsung Galaxy A21s A217F 5.1" Unlocked Cell Phone 4GB RAM 64GB ROM Octa Core Exynos 850 48mp Dual Sim Android Smartphone | $220 | ||
Samsung Galaxy A51
Buy used:
$72
| Product | Store | Price | |
|---|---|---|---|
| Samsung Galaxy S20 5G, 128GB, Cosmic Gra...Samsung Galaxy S20 5G, 128GB, Cosmic Gray - Unlocked (Renewed) | $195 | ||
| Samsung Galaxy A51 SM-A515U-128GB-Prism ...Samsung Galaxy A51 SM-A515U-128GB-Prism Crush Black (Sprint/T-Mobile) single sim | $108 | ||
| Samsung Galaxy A51 (2019), Tracfone Only...Samsung Galaxy A51 (2019), Tracfone Only | Black, 128 GB, 6.5 in | Grade B- | $72 | ||
| Samsung Galaxy A51 SM-A515U - 128GB - Bl...Samsung Galaxy A51 SM-A515U - 128GB - Black - ( Factory Unlocked) - Good | $105 | ||
| ⭐ GSM UNLOCKED ⭐ Samsung Galaxy A51 ⭐ 12...⭐ GSM UNLOCKED ⭐ Samsung Galaxy A51 ⭐ 128GB Black SM-A515U - Excellent | $149 | ||
| Samsung Galaxy Global Version A51 A515F ...Samsung Galaxy Global Version A51 A515F 6.5" Unlocked Cell Phone 4GB + 128GB ROM Triple Camera 48MP Dual SIM Android Smartphone | $220 | ||
| 2020 Samsung Galaxy A51 A515F 2SIM Unloc...2020 Samsung Galaxy A51 A515F 2SIM Unlocked Mobile Phone 6.5" 6GB RAM 128GB ROM Octa Core NFC 4Cameras 48MP Android10 Smartphone | $280 | ||
| Samsung Galaxy A51 5G A516U 6.5 inches 6...Samsung Galaxy A51 5G A516U 6.5 inches 6GB RAM 128GB ROM Android Cell Phone Camera 48MP Refurbished 5G Mobile Phone US Version | $257 | ||
When you buy through our links, we may earn a commission.
User reviews
Overall rating
Features
Build quality
7.9/10
27 votes
8.7/10
40 votes
Display quality
7.6/10
27 votes
9.2/10
40 votes
Battery life
8.8/10
27 votes
8.0/10
40 votes
Photography
7.6/10
27 votes
8.6/10
40 votes
Performance
7.8/10
27 votes
8.2/10
40 votes
Design
We consider a lower weight better because lighter devices are more comfortable to carry. A lower weight is also an advantage for home appliances, as it makes transportation easier, and for many other types of products.
The thickness (or depth) of the product.
The width represents the horizontal dimension of the product.
The height represents the vertical dimension of the product.
The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes.
Ingress Protection (IP) rating
Unknown. Help us by suggesting a value. (Samsung Galaxy A21s)
Unknown. Help us by suggesting a value. (Samsung Galaxy A51)
The first number of the IP rating refers to protection against dust, while the second number refers to protection against liquid. E.g. a first number of 6 denotes that it is completely dustproof, and a second number of 7 denotes that the device can withstand full immersion in water.
Volume is the quantity of three-dimensional space enclosed by the product's chassis or, in simpler terms, the space the product occupies.
lowest potential operating temperature
Unknown. Help us by suggesting a value. (Samsung Galaxy A21s)
Unknown. Help us by suggesting a value. (Samsung Galaxy A51)
The minimum temperature at which the device can perform to the optimal level.
maximum operating temperature
Unknown. Help us by suggesting a value. (Samsung Galaxy A21s)
Unknown. Help us by suggesting a value. (Samsung Galaxy A51)
The maximum temperature at which the device can perform to the optimal level.
Display
The bigger the screen size is, the better the user experience.
The type of technology used in the display.
Pixel density is a measurement of a screen's resolution, expressed as the number of pixels per inch (PPI) on the screen. A higher pixel density translates into more clarity and sharpness for the images rendered on the screen, thus improving the quality of the viewing experience.
Resolution is an essential indicator of a screen's image quality, representing the maximum amount of pixels that can be shown on the screen. The resolution is given as a compound value, comprised of horizontal and vertical pixels.
The frequency at which the screen is refreshed. Higher frequency results in less flickering (less noise) and more natural movement representation in action-intense scenes.
touch sampling rate
Unknown. Help us by suggesting a value. (Samsung Galaxy A21s)
Unknown. Help us by suggesting a value. (Samsung Galaxy A51)
The touch sampling rate is the speed at which a screen can register your touch input and respond by rendering the next frame. Also called the touch refresh rate.
brightness (typical)
Unknown. Help us by suggesting a value. (Samsung Galaxy A21s)
Unknown. Help us by suggesting a value. (Samsung Galaxy A51)
A nit is a measurement of the light that a display emits, equal to one candela per square meter. Brighter displays ensure a screen's contents are easy to read, even in sunny conditions.
Damage-resistant glass (such as Corning Gorilla Glass or Asahi Dragontrail Glass) is thin, lightweight, and can withstand high levels of force.
Gorilla Glass is one of the most popular brands of chemically strengthened glass, manufactured by Corning. Several versions have been developed, the newer ones being more durable and providing better damage resistance.
Performance
The internal storage refers to the built-in storage space available in a device for system data, apps, and user-generated data. With a large amount of internal storage, you can save more files and apps on your device.
Random-access memory (RAM) is a form of volatile memory used to store working data and machine code currently in use. It is a quick-access, temporary virtual storage that can be read and changed in any order, thus enabling fast data processing.
A newer version of Android generally provides a better user experience. Major Android releases include new features and improvements to performance, as well as important security updates.
AnTuTu is one of the most important benchmarks for Android devices. The score reflects the overall performance of a device by summing up results of individual tests that various parameters, such as RAM speed, CPU performance, 2D & 3D graphics performance.
Wild Life is a cross-platform benchmark developed by 3DMark that tests the graphical performance of a device (using the Vulkan API on Android/Windows and the Metal API on iOS). Source: 3DMark.
Wild Life is a cross-platform benchmark developed by 3DMark that tests the graphical performance of a device (using the Vulkan API on Android/Windows and the Metal API on iOS). The Unlimited version runs off-screen so that factors such as display resolution don’t affect the score. Source: 3DMark.
3DMark Wild Life Extreme benchmark
Unknown. Help us by suggesting a value. (Samsung Galaxy A21s)
Unknown. Help us by suggesting a value. (Samsung Galaxy A51)
Wild Life is a cross-platform benchmark developed by 3DMark that tests the graphical performance of a device (using the Vulkan API on Android/Windows and the Metal API on iOS). The Extreme version is much more graphically-demanding than the standard Wild Life benchmark. Source: 3DMark.
Geekbench 5 is a cross-platform benchmark that measures a processor's multi-core performance. (Source: Primate Labs, 2023)
Geekbench 5 is a cross-platform benchmark that measures a processor's single-core performance. (Source: Primate Labs, 2023)
Cameras
The number of megapixels determines the resolution of the images captured with the main camera. A higher megapixel count means that the camera is capable of capturing more details. However, the megapixel count is not the only important element determining the quality of an image.
The number of megapixels determines the resolution of the images captured with the front camera. A higher megapixel count means that the front camera is capable of capturing more details, an essential factor for taking high-resolution selfies.
Optical image stabilization uses gyroscopic sensors to detect the vibrations of the camera. The lens adjusts the optical path accordingly, ensuring that any type of motion blur is corrected before the sensor captures the image.
The maximum resolution available for videos shot with the main camera. Although it may be possible to choose among other frame rates, those recordings usually have lower resolutions.
With a wider aperture the sensor can capture more light, helping to avoid blur by enabling a faster shutter speed. It also provides a shallow depth of field, allowing you to blur the background to focus attention on the subject.
A dual-tone flash has LED lights with different color temperatures, delivering a better color balance to photos and videos.
A BSI (backside illuminated) sensor is a camera image sensor which captures better quality images in poor lighting conditions, and offers better overall sharpness and image quality.
When recording movies they stay focussed and sharp.
Phase-detection autofocus is much faster than a contrast detection autofocus, allowing for sharper images.
Operating system
This privacy feature alerts you with a small notification when an app copies data from your clipboard.
This privacy feature allows you to share your approximate location with an app instead of your precise location.
You can enable or disable an app’s access to the camera or microphone on your device. There are also indication icons to show you when an app uses the camera or microphone.
Mail Privacy Protection is a feature built into the default email app that blocks senders from using “tracking pixels” to see when you’ve read an email. It also hides your IP address from senders.
Theme customization allows you to easily change the appearance of the user interface (UI). For example, by changing the system colors or the app icons.
Some apps track your activity even when the app is not in use. This privacy feature allows you to block this tracking, either across all apps or on a per-app basis.
This setting (in the default browser) allows you to block cross-site tracking cookies and data to help protect your privacy.
On-device machine learning is used to recognize people, places, and more in the Photos app. The algorithms run on the device, where this sensitive data is then kept. Competing services upload the photos and perform this on their servers, which requires the sharing of personal data.
This means you don’t have to wait for the entire game to download first, as the later stages of the game download while you are playing.
Battery
Battery power, or battery capacity, represents the amount of electrical energy that a battery can store. More battery power can be an indication of longer battery life.
It supports a wireless charging standard such as Qi. To charge the device, you simply put it down on a compatible charging pad.
Fast charging technologies, like Qualcomm’s Quick Charge or MediaTek’s Pump Express, are used to reduce the time it takes to charge a device. For example, with Quick Charge 3.0, the battery can be charged to 50% in just 30 minutes.
Charging speeds are expressed in watts (W), a measure of electrical power. A higher wattage results in a faster charging speed. In order to achieve the advertised charging speed, it is important to use a compatible charger.
wireless charging speed
Unknown. Help us by suggesting a value. (Samsung Galaxy A21s)
Unknown. Help us by suggesting a value. (Samsung Galaxy A51)
Charging speeds are expressed in watts (W), a measure of electrical power. A higher wattage results in a faster charging speed. In order to achieve the advertised charging speed, a compatible wireless charger must be used.
reverse wireless charging speed
Unknown. Help us by suggesting a value. (Samsung Galaxy A21s)
Unknown. Help us by suggesting a value. (Samsung Galaxy A51)
Charging speeds are expressed in watts (W), a measure of electrical power. A higher wattage results in a faster charging speed.
The battery is removable and can be replaced by the user if broken.
The ultra power-saving mode, also called low power mode, is an effective way to extend the battery life of the device. Usually, it involves limiting screen brightness and contrast, disabling location services, restricting connectivity, and turning off nonessential apps.
An indicator shows you when the device has low battery.
Audio
With a standard mini jack socket, you can use the device with most headphones.
Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.
aptX is a codec used for transmitting audio wirelessly with Bluetooth. It is developed by Qualcomm, and supports 16-bit audio at a bit rate of 384kbps.
LDAC is a codec developed by Sony for Bluetooth audio. It is capable of a very high bitrate of 990kbps, which provides high resolution audio. It can also automatically adjust to a lower bitrate of 330kbps or 660kbps to increase stability.
aptX HD is an audio codec for Bluetooth devices that is developed by Qualcomm. It supports high quality 24-bit audio (at a bit rate of 576kbps).
aptx Adaptive is an audio codec for Bluetooth devices that is developed by Qualcomm. It has a variable bit rate (between 279kbps and 420kbps), which means it can adjust the bit rate for different scenarios, such as listening to HD audio or reducing interference from other devices.
A built-in FM radio tuner allows you to listen to most of the live-broadcasted FM radio stations without using the internet.
More microphones result in better sound quality and enable the device to filter out background noise.
Phones with physical keyboards have dedicated media keys, such as: play, stop, next, previous, volume up/down, etc.
Features
The fifth-generation wireless technology delivers higher speeds and lower latency than the previous, fourth-generation tech.
The Wi-Fi versions supported by the device.
The download speed is a measurement of the internet connection bandwidth, representing the maximum data transfer rate at which a device can access online content.
The upload speed is a measurement of the internet connection bandwidth, representing the maximum data transfer rate at which a device can send information to a server or another device.
The USB Type-C features reversible plug orientation and cable direction.
Newer USB versions are faster and have better power management.
NFC (near-field communication) allows a device to perform simple wireless transactions, such as mobile payments. Note: this feature may not be available in all markets.
The number and type of SIM cards supported.
The device has a fingerprint scanner which identifies the user.
Miscellaneous
A video light helps when recording a movie in low-light conditions.
Price comparison
Samsung Galaxy A21s
Buy used:
$65
| Product | Store | Price | |
|---|---|---|---|
| Samsung Galaxy A21s DS 64 GB 3GB RAM 6....Samsung Galaxy A21s DS 64 GB 3GB RAM 6.5" 48MP Unlocked SmartPhone very clean | $120 | ||
| Samsung Galaxy A21S SM-A217F/DSN (Blue 3...Samsung Galaxy A21S SM-A217F/DSN (Blue 32GB) Tim Mobile Dual Sim | $100 | ||
| Samsung Galaxy A21S SM-A217F/DSN (Blue 3...Samsung Galaxy A21S SM-A217F/DSN (Blue 32GB) EE Dual Sim CRACKED GLAS | $65 | ||
| OPEN BOX Samsung Galaxy A21s A217F/DS Du...OPEN BOX Samsung Galaxy A21s A217F/DS Dual SIM 64GB FACTORY UNLOCKED Smartphone | $161 | ||
| Global Samsung Galaxy A21s A217F 5.1" Un...Global Samsung Galaxy A21s A217F 5.1" Unlocked Cell Phone 4GB RAM 64GB ROM Octa Core Exynos 850 48mp Dual Sim Android Smartphone | $220 | ||
Samsung Galaxy A51
Buy used:
$72
| Product | Store | Price | |
|---|---|---|---|
| Samsung Galaxy S20 5G, 128GB, Cosmic Gra...Samsung Galaxy S20 5G, 128GB, Cosmic Gray - Unlocked (Renewed) | $195 | ||
| Samsung Galaxy A51 SM-A515U-128GB-Prism ...Samsung Galaxy A51 SM-A515U-128GB-Prism Crush Black (Sprint/T-Mobile) single sim | $108 | ||
| Samsung Galaxy A51 (2019), Tracfone Only...Samsung Galaxy A51 (2019), Tracfone Only | Black, 128 GB, 6.5 in | Grade B- | $72 | ||
| Samsung Galaxy A51 SM-A515U - 128GB - Bl...Samsung Galaxy A51 SM-A515U - 128GB - Black - ( Factory Unlocked) - Good | $105 | ||
| ⭐ GSM UNLOCKED ⭐ Samsung Galaxy A51 ⭐ 12...⭐ GSM UNLOCKED ⭐ Samsung Galaxy A51 ⭐ 128GB Black SM-A515U - Excellent | $149 | ||
| Samsung Galaxy Global Version A51 A515F ...Samsung Galaxy Global Version A51 A515F 6.5" Unlocked Cell Phone 4GB + 128GB ROM Triple Camera 48MP Dual SIM Android Smartphone | $220 | ||
| 2020 Samsung Galaxy A51 A515F 2SIM Unloc...2020 Samsung Galaxy A51 A515F 2SIM Unlocked Mobile Phone 6.5" 6GB RAM 128GB ROM Octa Core NFC 4Cameras 48MP Android10 Smartphone | $280 | ||
| Samsung Galaxy A51 5G A516U 6.5 inches 6...Samsung Galaxy A51 5G A516U 6.5 inches 6GB RAM 128GB ROM Android Cell Phone Camera 48MP Refurbished 5G Mobile Phone US Version | $257 | ||
When you buy through our links, we may earn a commission.
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Comments
Some
1 year ago
8 / 10
A good phone, but the newer phones are better
Some
1 year ago
8 / 10
Been using this phone as a daily driver since 28th December 2020. It's good for lightweight games, social media, web browsing and basic phone tasks you'd expect, but the battery life is starting to decrease, and Samsung doesn't sell this phone new anymore. The 32GB fills up quickly with lots of photos, as many A series in 2022 have 64 - 128GB depending on how much money you are willing to spend. On the lighter side, the rear quad camera setup is great, shooting photos in 1800p (Close to 4k) and shooting videos in 720p (Still looks good though!) And the front camera shoots photo in 4k and shoots video in 1080p! Overall, this phone has impressed me over the 14 months and counting I have used this phone.
Pros
Cons
Power _
1 year ago
7 / 10
Un buon telefono, consigliato per cambio telefono
Power _
1 year ago
7 / 10
Pros
Cons
Ledgend
1 year ago
6 / 10
Nice budget phone with very good battery life
Ledgend
1 year ago
6 / 10
Pros
Cons