134 facts in comparison

Samsung Galaxy A21s vs Xiaomi Redmi 9

Samsung Galaxy A21s
Xiaomi Redmi 9

Why is Samsung Galaxy A21s better than Xiaomi Redmi 9?

  • 2GB more RAM memory
    ?

    6GBvs4GB
  • 8.11% faster CPU speed
    ?

    4 x 2GHz & 4 x 2GHzvs2 x 2 & 6 x 1.8GHz
  • 2.14x more megapixels (main camera)
    ?

    48MP & 8MP & 2MP & 2MPvs13 & 8 & 5 & 2MP
  • 1.63x more megapixels (front camera)
    ?

    13MPvs8MP
  • 64GB more internal storage
    ?

    128GBvs64GB
  • 9.09% wider aperture at minimum focal length
    ?

    f/2 & f/2.2 & f/2.4 & f/2.4vs2.2 & 2.2 & 2.4 & 2.4f
  • 6g lighter
    ?

    192gvs198g
  • 0.2mm thinner
    ?

    8.9mmvs9.1mm

Why is Xiaomi Redmi 9 better than Samsung Galaxy A21s?

  • 0.4% more battery power
    ?

    5020mAhvs5000mAh
  • 46.3% higher pixel density
    ?

    395ppivs270ppi
  • 2.19x higher resolution
    ?

    1080 x 2340pxvs720 x 1600px
  • 0.46% bigger screen size
    ?

    6.53"vs6.5"
  • Has branded damage-resistant glass
    ?
  • Has a BSI sensor
    ?
  • Supports two physical SIM cards
    ?
  • Supports slow-motion video recording
    ?

Price comparison

Samsung Galaxy A21s

Buy used:

$154.00

ProductStorePrice
Samsung Galaxy A21s dealextremeWireless Charger For iPhone 11 Pro 8 X S...Wireless Charger For iPhone 11 Pro 8 X Samsung S10 Fast Wireless Charger Stand For iWatch 5 4 For Samsung Watch For Galaxy Buds
dealextreme logo
$41.49
Samsung Galaxy A21s dealextremeBASEUS 2-in-1 Wireless Charger 15W Qi Ch...BASEUS 2-in-1 Wireless Charger 15W Qi Charging Stand Pad For Airpods IPhone Huawei Samsung Galaxy And More
dealextreme logo
$30.49
Samsung Galaxy A21s dealextreme10W Qi Wireless Charger Car Air Vent Mou...10W Qi Wireless Charger Car Air Vent Mount Magnetic Phone Stand For Samsung For iPhone XR Samsung S9 S8 Note 9
dealextreme logo
$28.99

Xiaomi Redmi 9

Buy used:

$299.99

ProductStorePrice
Xiaomi Redmi 9 AmazonXiaomi Redmi 9 EU 64Gb ROM 4Gb Ram Sunse...Xiaomi Redmi 9 EU 64Gb ROM 4Gb Ram Sunset Purple
Amazon logo
$229.50
Xiaomi Redmi 9 AmazonXiaomi Redmi Note 9 DualSim 6.53" 48MP I...Xiaomi Redmi Note 9 DualSim 6.53" 48MP International Global Version (Forest Green, 3GB/64GB)
Amazon logo
$199.50
Xiaomi Redmi 9 oneplus_usOnePlus 9 5G LE2115 US 128GB 8GB Winter ...OnePlus 9 5G LE2115 US 128GB 8GB Winter Mist
oneplus_us logo
$659.00
Xiaomi Redmi 9 oneplus_usOnePlus 9 5G LE2115 US 128GB 8GB Astral ...OnePlus 9 5G LE2115 US 128GB 8GB Astral Black
oneplus_us logo
$659.00
Xiaomi Redmi 9 oneplus_usOnePlus 9 Pro 5G LE2125 US 256GB 12GB Mo...OnePlus 9 Pro 5G LE2125 US 256GB 12GB Morning Mist
oneplus_us logo
$899.00
Xiaomi Redmi 9 banggood_wwUniwaHV3グローバル4Gスマートフォン7.0インチ8000mAh4GB 6...UniwaHV3グローバル4Gスマートフォン7.0インチ8000mAh4GB 64GB NFC Android 9.0 5MP / 13MPダブルカメラデュアルSIMカードデュアルスタンバイIP67防水3プルーフフォン
banggood_ww logo
¥35,940.00
Xiaomi Redmi 9 dealextremeXiaomi Redmi 9 6.53 Inch Smartphone Heli...Xiaomi Redmi 9 6.53 Inch Smartphone Helio G80 Octa Core 13MP Camera 5020mAh Battery - Global Version
dealextreme logo
$171.99
Xiaomi Redmi 9 dealextremeGlobal Version Xiaomi Redmi Note 9 Pro S...Global Version Xiaomi Redmi Note 9 Pro Smartphone 6GB 128GB Snapdragon 720G 5020mAh Cell Phone 6.67 Dot Display
dealextreme logo
$327.69
Xiaomi Redmi 9 dealextremeXiaomi Redmi Note 9 Pro Smartphone 6GB 6...Xiaomi Redmi Note 9 Pro Smartphone 6GB 64GB Snapdragon 720G Octa Core 64MP Quad Cams 5020mAh Cellphone 6.67inch Dot Display
dealextreme logo
$272.99

User reviews

Overall Rating

Samsung Galaxy A21s
8.3
10 User reviews
Samsung Galaxy A21s
8.3/10
10 User reviews
Xiaomi Redmi 9
9.4
9 User reviews
Xiaomi Redmi 9
9.4/10
9 User reviews

Features

Build quality

8.2/10
10 votes
9.0/10
8 votes

Display quality

7.3/10
10 votes
9.5/10
8 votes

Battery life

9.1/10
10 votes
9.1/10
8 votes

Photography

7.7/10
10 votes
8.8/10
8 votes

Performance

8.4/10
10 votes
8.8/10
8 votes

Comments

Santiago

Santiago

1 month ago

10 / 10

El mejor que el iphone 6 ×D

Santiago

Santiago

1 month ago

10 / 10

Pros

  • Todo es mejor que el iphone 6

Cons

  • No tiene desventajas
2 users found this helpful
Power _

Power _

2 months ago

7 / 10

Un buon telefono, consigliato per cambio telefono

Power _

Power _

2 months ago

7 / 10

Pros

  • Più fotocamere
  • Dual sim
  • Buona memoria
  • Duraturo nel tempo
  • Lettore di impronte
  • Usb tipo C con carica rapida supportata
  • Jack 3.5 mm

Cons

  • Non residente all'acqua
  • Qualità dello schermo comunque buona
1 users found this helpful
Ledgend

Ledgend

1 month ago

6 / 10

Nice budget phone with very good battery life

Ledgend

Ledgend

1 month ago

6 / 10

Pros

  • Good Battery
  • 3.5mm Headphone Jack
  • Android 11
  • Large Display

Cons

  • Bad Sound Quality
  • Slow Camera
  • Mediocre Display Quality
1 users found this helpful

Design

1.weather-sealed (splashproof)
Samsung Galaxy A21s
Xiaomi Redmi 9
The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes.
2.weight

192g

198g

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.
3.thickness

8.9mm

9.1mm

We consider a thinner chassis better because it makes the product more compact and portable. Thinness is a feature highlighted by many manufacturers of mobile devices, but it is essential for a wide range of products.
4.width

75.3mm

77.01mm

The width represents the horizontal dimension of the product. We consider a smaller width better because it assures easy maneuverability.
5.height

163.6mm

163.32mm

The height represents the vertical dimension of the product. We consider a smaller height better because it assures easy maneuverability.
6.volume

109.64cm³

114.45cm³

Volume is the quantity of three-dimensional space enclosed by the product's chassis or, in simpler terms, the space the product occupies.
7.has a physical QWERTY keyboard
Samsung Galaxy A21s
Xiaomi Redmi 9
Text messaging is much faster due to a hardware keyboard.

Display

1.pixel density

270ppi

395ppi

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.
2.resolution

720 x 1600px

1080 x 2340px

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.
3.screen size

6.5"

6.53"

The bigger the screen size is, the better the user experience.
4.has branded damage-resistant glass
Samsung Galaxy A21s
Xiaomi Redmi 9
Damage-resistant glass (such as Corning Gorilla Glass or Asahi Dragontrail Glass) is thin, lightweight, and can withstand high levels of force.
5.has an IPS screen
Samsung Galaxy A21s
Xiaomi Redmi 9
IPS (In-Plane Switching) is a technology used for LCDs. It was designed to overcome the main limitations of conventional twisted nematic TFT displays: limited viewing angles and low-quality color reproduction. PLS (Plane-to-Line Switching) is a type of IPS screen developed by Samsung, with increased brightness and lower production costs.
6.has a touch screen
Samsung Galaxy A21s
Xiaomi Redmi 9
You can operate the device easily, by pressing the screen with your fingers.
7.Has sapphire glass display
Samsung Galaxy A21s
Xiaomi Redmi 9
Sapphire crystal glass is an extremely durable material, which is surpassed only by diamond in terms of hardness. A sapphire crystal display is stronger and more scratch resistant than toughened glass such as Corning Gorilla Glass.
8.Has an e-paper display
Samsung Galaxy A21s
Xiaomi Redmi 9
An e-paper display provides a high contrast allowing users to read in direct sunlight without requiring much power.

Performance

1.RAM

6GB

4GB

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.
2.CPU speed

4 x 2GHz & 4 x 2GHz (Samsung Exynos 850)

2 x 2GHz & 6 x 1.8GHz (MediaTek Helio G80)

The CPU speed indicates how many processing cycles per second can be executed by a CPU, considering all of its cores (processing units). It is calculated by adding the clock rates of each core or, in the case of multi-core processors employing different microarchitectures, of each group of cores.
3.has an external memory slot
Samsung Galaxy A21s
Xiaomi Redmi 9
The device has a standard memory slot (such as an SD or micro SD card slot) that enables you to extend the built-in internal storage with affordable memory modules, or easily retrieve data, such as photographs, from the memory card.
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.
5.Has integrated LTE
Samsung Galaxy A21s (Samsung Exynos 850)
Xiaomi Redmi 9 (MediaTek Helio G80)
The system on a chip (SoC) has an integrated LTE cellular chip. LTE is capable of downloading at faster speeds than older, 3G technology.
Small semiconductors provide better performance and reduced power consumption. Chipsets with a higher number of transistors, semiconductor components of electronic devices, offer more computational power. A small form factor allows more transistors to fit on a chip, therefore increasing its performance.
It can support faster memory, which will give quicker system performance.
8.Supports 64-bit
Samsung Galaxy A21s (Samsung Exynos 850)
Xiaomi Redmi 9 (MediaTek Helio G80)
A 32-bit operating system can only support up to 4GB of RAM. 64-bit allows more than 4GB, giving increased performance. It also allows you to run 64-bit apps.
9.Has integrated graphics
Samsung Galaxy A21s (Samsung Exynos 850)
Xiaomi Redmi 9 (MediaTek Helio G80)
With integrated graphics you don’t need to buy a separate graphics card.

Cameras

1.megapixels (main camera)

48MP & 8MP & 2MP & 2MP

13MP & 8MP & 5MP & 2MP

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.
3.has built-in optical image stabilization
Samsung Galaxy A21s
Xiaomi Redmi 9
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.
4.video recording (main camera)

1080 x 30fps

1080 x 30fps

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.
5.wide aperture (main camera)

f/2 & f/2.2 & f/2.4 & f/2.4

f/2.2 & f/2.2 & f/2.4 & f/2.4

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.
6.Has a dual-tone LED flash
Samsung Galaxy A21s
Xiaomi Redmi 9
A dual-tone flash has LED lights with different color temperatures, delivering a better color balance to photos and videos.
7.has a BSI sensor
Samsung Galaxy A21s
Xiaomi Redmi 9
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.
8.has continuous autofocus when recording movies
Samsung Galaxy A21s
Xiaomi Redmi 9
When recording movies they stay focussed and sharp.
9.Has phase-detection autofocus for photos
Samsung Galaxy A21s
Xiaomi Redmi 9
Phase-detection autofocus is much faster than a contrast detection autofocus, allowing for sharper images.

Audio

1.has stereo speakers
Samsung Galaxy A21s
Xiaomi Redmi 9
Devices with stereo speakers deliver sound from independent channels on both left and right sides, creating a richer sound and a better experience.
2.has a socket for a 3.5 mm audio jack
Samsung Galaxy A21s
Xiaomi Redmi 9
With a standard mini jack socket, you can use the device with most headphones.
3.Has a radio
Samsung Galaxy A21s
Xiaomi Redmi 9
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.

Battery

1.battery power

5000mAh

5020mAh

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.
2.has wireless charging
Samsung Galaxy A21s
Xiaomi Redmi 9
The manufacturer offers a branded wireless charging kit. To charge the device, you simply put it down on its charging base.
3.Supports fast charging
Samsung Galaxy A21s
Xiaomi Redmi 9
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.
4.has a removable battery
Samsung Galaxy A21s
Xiaomi Redmi 9
The battery is removable and can be replaced by the user if broken.
5.Has an ultra power-saving mode
Samsung Galaxy A21s (Android 10)
Xiaomi Redmi 9 (Android 10)
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.
6.has a battery level indicator
Samsung Galaxy A21s
Xiaomi Redmi 9
An indicator shows you when the device has low battery.
7.has a rechargeable battery
Samsung Galaxy A21s
Xiaomi Redmi 9
The battery can be recharged and used over again.

Features

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.
2.has NFC
Samsung Galaxy A21s
Xiaomi Redmi 9
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.
3.supports Wi-Fi 5 (802.11ac)
Samsung Galaxy A21s
Xiaomi Redmi 9
802.11ac wireless works on the 5GHz frequency range. It offers higher transfer rates, improved reliability, and improved power consumption. It provides advantages for gaming and HD video streaming.
4.Has a fingerprint scanner
Samsung Galaxy A21s
Xiaomi Redmi 9
The device has a fingerprint scanner which identifies the user.
5.is DLNA-certified
Samsung Galaxy A21s
Xiaomi Redmi 9
All DLNA-certified products are compatible with one another. When different devices are connected to the same network, data can be transferred easily between them.
Bluetooth is a wireless technology standard that allows data transfers between devices placed in close proximity, using short-wavelength, ultra-high frequency radio waves. Newer versions provide faster data transfers.
7.supports two physical SIM cards
Samsung Galaxy A21s
Xiaomi Redmi 9
A dual-SIM mobile phone can work with two SIM cards at the same time.
8.has 5G support
Samsung Galaxy A21s (Samsung Exynos 850)
Xiaomi Redmi 9 (MediaTek Helio G80)
The fifth-generation wireless technology delivers higher speeds and lower latency than the previous, fourth-generation tech.
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.

Price comparison

Samsung Galaxy A21s

Buy used:

$154.00

ProductStorePrice
Samsung Galaxy A21s dealextremeWireless Charger For iPhone 11 Pro 8 X S...Wireless Charger For iPhone 11 Pro 8 X Samsung S10 Fast Wireless Charger Stand For iWatch 5 4 For Samsung Watch For Galaxy Buds
dealextreme logo
$41.49
Samsung Galaxy A21s dealextremeBASEUS 2-in-1 Wireless Charger 15W Qi Ch...BASEUS 2-in-1 Wireless Charger 15W Qi Charging Stand Pad For Airpods IPhone Huawei Samsung Galaxy And More
dealextreme logo
$30.49
Samsung Galaxy A21s dealextreme10W Qi Wireless Charger Car Air Vent Mou...10W Qi Wireless Charger Car Air Vent Mount Magnetic Phone Stand For Samsung For iPhone XR Samsung S9 S8 Note 9
dealextreme logo
$28.99

Xiaomi Redmi 9

Buy used:

$299.99

ProductStorePrice
Xiaomi Redmi 9 AmazonXiaomi Redmi 9 EU 64Gb ROM 4Gb Ram Sunse...Xiaomi Redmi 9 EU 64Gb ROM 4Gb Ram Sunset Purple
Amazon logo
$229.50
Xiaomi Redmi 9 AmazonXiaomi Redmi Note 9 DualSim 6.53" 48MP I...Xiaomi Redmi Note 9 DualSim 6.53" 48MP International Global Version (Forest Green, 3GB/64GB)
Amazon logo
$199.50
Xiaomi Redmi 9 oneplus_usOnePlus 9 5G LE2115 US 128GB 8GB Winter ...OnePlus 9 5G LE2115 US 128GB 8GB Winter Mist
oneplus_us logo
$659.00
Xiaomi Redmi 9 oneplus_usOnePlus 9 5G LE2115 US 128GB 8GB Astral ...OnePlus 9 5G LE2115 US 128GB 8GB Astral Black
oneplus_us logo
$659.00
Xiaomi Redmi 9 oneplus_usOnePlus 9 Pro 5G LE2125 US 256GB 12GB Mo...OnePlus 9 Pro 5G LE2125 US 256GB 12GB Morning Mist
oneplus_us logo
$899.00
Xiaomi Redmi 9 banggood_wwUniwaHV3グローバル4Gスマートフォン7.0インチ8000mAh4GB 6...UniwaHV3グローバル4Gスマートフォン7.0インチ8000mAh4GB 64GB NFC Android 9.0 5MP / 13MPダブルカメラデュアルSIMカードデュアルスタンバイIP67防水3プルーフフォン
banggood_ww logo
¥35,940.00
Xiaomi Redmi 9 dealextremeXiaomi Redmi 9 6.53 Inch Smartphone Heli...Xiaomi Redmi 9 6.53 Inch Smartphone Helio G80 Octa Core 13MP Camera 5020mAh Battery - Global Version
dealextreme logo
$171.99
Xiaomi Redmi 9 dealextremeGlobal Version Xiaomi Redmi Note 9 Pro S...Global Version Xiaomi Redmi Note 9 Pro Smartphone 6GB 128GB Snapdragon 720G 5020mAh Cell Phone 6.67 Dot Display
dealextreme logo
$327.69
Xiaomi Redmi 9 dealextremeXiaomi Redmi Note 9 Pro Smartphone 6GB 6...Xiaomi Redmi Note 9 Pro Smartphone 6GB 64GB Snapdragon 720G Octa Core 64MP Quad Cams 5020mAh Cellphone 6.67inch Dot Display
dealextreme logo
$272.99

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