54points

Oppo A91

71points

Samsung Galaxy A51

vs
vs

135 facts in comparison

Oppo A91 vs Samsung Galaxy A51

Oppo A91
Samsung Galaxy A51

Why is Oppo A91 better than Samsung Galaxy A51?

  • 0.63% more battery power
    ?

    4025mAhvs4000mAh
  • 0.74% higher pixel density
    ?

    408ppivs405ppi
  • 2.5% faster CPU speed
    ?

    4 x 2.1GHz & 4 x 2GHzvs4 x 2.3 & 4 x 1.7GHz
  • 10% wider aperture at minimum focal length
    ?

    f/1.8 & f/2.2 & f/2.4 & f/2.4vs2 & 2.2 & 2.4 & 2.2f
  • 2 newer Gorilla Glass version
    ?

    5vs3
  • 0.3mm narrower
    ?

    73.3mmvs73.6mm
  • 9.09% wider aperture at minimum focal length (front camera)
    ?

    f/2.0 vs2.2f

Why is Samsung Galaxy A51 better than Oppo A91?

  • 16.67% more megapixels (main camera)
    ?

    48MP & 12MP & 5MP & 5MPvs48 & 8 & 2 & 2MP
  • 1.56% bigger screen size
    ?

    6.5"vs6.4"
  • 2x more megapixels (front camera)
    ?

    32MPvs16MP
  • Has built-in optical image stabilization
    ?
  • 2x better video recording quality (main camera)
    ?

    2160 x 30fpsvs1080 x 30fps
  • 2x faster downloads
    ?

    600MBits/svs300MBits/s
  • Has NFC
    ?
  • 0.8 newer Bluetooth version
    ?

    5vs4.2

Price comparison

Oppo A91

Buy used:

$162.00

ProductStorePrice
Oppo A91 AmazonSamsung Galaxy A51 (SM-A515F/DS) Dual SI...Samsung Galaxy A51 (SM-A515F/DS) Dual SIM 128GB, GSM Unlocked - Prism Crush Black
Amazon logo
$266.97
Oppo A91 AmazonSamsung Galaxy A71 SM-A715F/DS 4G LTE 12...Samsung Galaxy A71 SM-A715F/DS 4G LTE 128GB + 6GB Ram Octa Core (LTE USA Latin Caribbean Euro) w/Four Cameras (64+12+5+5mp) Android (Black)
Amazon logo
$347.99
Oppo A91 AmazonSamsung Galaxy A9 2018 128GB 6GB RAM 6.3...Samsung Galaxy A9 2018 128GB 6GB RAM 6.3 Display 4G LTE Dual SIM GSM Unlocked - Lemonade Blue
Amazon logo
$274.99
Oppo A91 AmazonOppo R17 128GB/8GB (Blue) 4G LTE 6.4" 23...Oppo R17 128GB/8GB (Blue) 4G LTE 6.4" 2340x1080 AMOLED - Factory Unlocked - GSM ONLY, NO CDMA - No Warranty in The USA
Amazon logo
$599.99
Oppo A91 AmazonHuawei Honor 8X (64GB + 4GB RAM) 6.5" HD...Huawei Honor 8X (64GB + 4GB RAM) 6.5" HD 4G LTE GSM Factory Unlocked Smartphone - International Version No Warranty JSN-L23 (Black)
Amazon logo
$199.99
Oppo A91 Amazongooplayer for Oppo Reno 3 Pro 5G Smartph...gooplayer for Oppo Reno 3 Pro 5G Smartphone 8G+128GB 6.5" AMOLED Android 10 Snapdragon 765G Octa Core 4025mAh VOOC 4.0 48.0MP OTG (Blue 8GB+128GB)
Amazon logo
$721.00

Samsung Galaxy A51

ProductStorePrice
Samsung Galaxy A51 AmazonSamsung Galaxy A51 (SM-A515F/DS) Dual SI...Samsung Galaxy A51 (SM-A515F/DS) Dual SIM 128GB, GSM Unlocked - Prism Crush Black
Amazon logo
$271.99
Samsung Galaxy A51 AmazonSamsung Galaxy A51 A515F 128GB DUOS GSM ...Samsung Galaxy A51 A515F 128GB DUOS GSM Unlocked Phone w/ Quad Camera 48 MP + 12 MP + 5 MP + 5 MP (International Variant/US Compatible LTE) - Prism Crush White
Amazon logo
$275.99
Samsung Galaxy A51 AmazonSamsung Galaxy A51 SM-A515F/LO, 6.5'', 4...Samsung Galaxy A51 SM-A515F/LO, 6.5'', 48.0MP Quad Camera, 6GB RAM + 128GB Internal Storage With 15W Fast Charging - Prism Crush Black
Amazon logo
$279.99
Samsung Galaxy A51 AmazonSamsung Galaxy A31-128GB / 4GB - A315G/D...Samsung Galaxy A31-128GB / 4GB - A315G/DSL Unlocked Dual Sim Phone w/Quad Camera 48MP+8MP+5MP+5MP GSM International Version (Prism Crush White)
Amazon logo
$229.95
Samsung Galaxy A51 AmazonSamsung Galaxy A51 (128GB, 4GB) 6.5", 48...Samsung Galaxy A51 (128GB, 4GB) 6.5", 48MP Quad Camera, Dual SIM GSM Unlocked A515F/DS- Global 4G LTE International Model (Prism Crush White) (Renewed)
Amazon logo
$249.99
Samsung Galaxy A51 AmazonSamsung Galaxy A31 64GB / 4GB - A315G/DS...Samsung Galaxy A31 64GB / 4GB - A315G/DSL Unlocked Dual Sim Phone w/Quad Camera 48MP+8MP+5MP+5MP GSM International Version (Prism Crush Black)
Amazon logo
$222.48
Samsung Galaxy A51 walmartAT&T PREPAID Samsung Galaxy A51 5G 128GB...AT&T PREPAID Samsung Galaxy A51 5G 128GB, Prism Crush Black
walmart logo
$9.99

Design

1.weather-sealed (splashproof)
Oppo A91
Samsung Galaxy A51
The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes.
2.weight

172g

172g

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

7.9mm

7.9mm

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.height

160.2mm

158.5mm

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

73.3mm

73.6mm

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

92.77cm³

92.16cm³

Volume is the quantity of three-dimensional space enclosed by the product's chassis or, in simpler terms, the space the product occupies.

Display

1.pixel density

408ppi

405ppi

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

1080 x 2400px

1080 x 2400px

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

6.4"

6.5"

The bigger the screen size is, the better the user experience.
4.has branded damage-resistant glass
Oppo A91
Samsung Galaxy A51
Damage-resistant glass (such as Corning Gorilla Glass or Asahi Dragontrail Glass) is thin, lightweight, and can withstand high levels of force.
5.Gorilla Glass version

5

3

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.
6.Has an OLED or AMOLED display
Oppo A91
Samsung Galaxy A51
OLED (Organic Light-Emitting Diode) displays are formed of organic materials that emit light. They have higher contrast ratios and wider viewing angles compared to LCDs. AMOLED and POLED are types of OLED displays.

Performance

1.CPU speed

4 x 2.1GHz & 4 x 2GHz (MediaTek Helio P70)

4 x 2.3GHz & 4 x 1.7GHz (Samsung Exynos 9611)

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.
2.RAM

8GB

8GB

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.
3.has an external memory slot
Oppo A91
Samsung Galaxy A51
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.
4.internal storage

128GB

128GB

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 A51 (Samsung Exynos 9611)
The system on a chip (SoC) has an integrated LTE cellular chip. LTE is capable of downloading at faster speeds than older, 3G technology.
6.semiconductor size
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.

Cameras

1.megapixels (main camera)

48MP & 8MP & 2MP & 2MP

48MP & 12MP & 5MP & 5MP

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.
2.megapixels (front camera)

16MP

32MP

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
Oppo A91
Samsung Galaxy A51
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

2160 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/1.8 & f/2.2 & f/2.4 & f/2.4

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

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
Oppo A91
Samsung Galaxy A51
A dual-tone flash has LED lights with different color temperatures, delivering a better color balance to photos and videos.

Audio

1.has stereo speakers
Oppo A91
Samsung Galaxy A51
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
Oppo A91
Samsung Galaxy A51
With a standard mini jack socket, you can use the device with most headphones.
3.Has a radio
Oppo A91
Samsung Galaxy A51
A built-in FM radio tuner allows you to listen to most of the live-broadcasted FM radio stations without using the internet.
4.number of microphones

2

2

More microphones result in better sound quality and enable the device to filter out background noise.

Battery

1.battery power

4025mAh

4000mAh

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
Oppo A91
Samsung Galaxy A51
The manufacturer offers a branded wireless charging kit. To charge the device, you simply put it down on its charging base.
3.has a removable battery
Oppo A91
Samsung Galaxy A51
The battery is removable and can be replaced by the user if broken.
4.Supports fast charging
Oppo A91
Samsung Galaxy A51
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.
5.Has an ultra power-saving mode
Oppo A91 (Android 9.0 Pie)
Samsung Galaxy A51 (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
Oppo A91
Samsung Galaxy A51
An indicator shows you when the device has low battery.

Features

1.download speed

300MBits/s (MediaTek Helio P70)

600MBits/s (Samsung Exynos 9611)

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.supports Wi-Fi 5 (802.11ac)
Oppo A91
Samsung Galaxy A51
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.
3.has NFC
Oppo A91
Samsung Galaxy A51
NFC (near-field communication) allows a device to perform simple wireless transactions.
4.Has a fingerprint scanner
Oppo A91
Samsung Galaxy A51
The device has a fingerprint scanner which identifies the user.
5.is DLNA-certified
Oppo A91
Samsung Galaxy A51
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.
6.Bluetooth version

4.2

5

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.

Price comparison

Oppo A91

Buy used:

$162.00

ProductStorePrice
Oppo A91 AmazonSamsung Galaxy A51 (SM-A515F/DS) Dual SI...Samsung Galaxy A51 (SM-A515F/DS) Dual SIM 128GB, GSM Unlocked - Prism Crush Black
Amazon logo
$266.97
Oppo A91 AmazonSamsung Galaxy A71 SM-A715F/DS 4G LTE 12...Samsung Galaxy A71 SM-A715F/DS 4G LTE 128GB + 6GB Ram Octa Core (LTE USA Latin Caribbean Euro) w/Four Cameras (64+12+5+5mp) Android (Black)
Amazon logo
$347.99
Oppo A91 AmazonSamsung Galaxy A9 2018 128GB 6GB RAM 6.3...Samsung Galaxy A9 2018 128GB 6GB RAM 6.3 Display 4G LTE Dual SIM GSM Unlocked - Lemonade Blue
Amazon logo
$274.99
Oppo A91 AmazonOppo R17 128GB/8GB (Blue) 4G LTE 6.4" 23...Oppo R17 128GB/8GB (Blue) 4G LTE 6.4" 2340x1080 AMOLED - Factory Unlocked - GSM ONLY, NO CDMA - No Warranty in The USA
Amazon logo
$599.99
Oppo A91 AmazonHuawei Honor 8X (64GB + 4GB RAM) 6.5" HD...Huawei Honor 8X (64GB + 4GB RAM) 6.5" HD 4G LTE GSM Factory Unlocked Smartphone - International Version No Warranty JSN-L23 (Black)
Amazon logo
$199.99
Oppo A91 Amazongooplayer for Oppo Reno 3 Pro 5G Smartph...gooplayer for Oppo Reno 3 Pro 5G Smartphone 8G+128GB 6.5" AMOLED Android 10 Snapdragon 765G Octa Core 4025mAh VOOC 4.0 48.0MP OTG (Blue 8GB+128GB)
Amazon logo
$721.00

Samsung Galaxy A51

ProductStorePrice
Samsung Galaxy A51 AmazonSamsung Galaxy A51 (SM-A515F/DS) Dual SI...Samsung Galaxy A51 (SM-A515F/DS) Dual SIM 128GB, GSM Unlocked - Prism Crush Black
Amazon logo
$271.99
Samsung Galaxy A51 AmazonSamsung Galaxy A51 A515F 128GB DUOS GSM ...Samsung Galaxy A51 A515F 128GB DUOS GSM Unlocked Phone w/ Quad Camera 48 MP + 12 MP + 5 MP + 5 MP (International Variant/US Compatible LTE) - Prism Crush White
Amazon logo
$275.99
Samsung Galaxy A51 AmazonSamsung Galaxy A51 SM-A515F/LO, 6.5'', 4...Samsung Galaxy A51 SM-A515F/LO, 6.5'', 48.0MP Quad Camera, 6GB RAM + 128GB Internal Storage With 15W Fast Charging - Prism Crush Black
Amazon logo
$279.99
Samsung Galaxy A51 AmazonSamsung Galaxy A31-128GB / 4GB - A315G/D...Samsung Galaxy A31-128GB / 4GB - A315G/DSL Unlocked Dual Sim Phone w/Quad Camera 48MP+8MP+5MP+5MP GSM International Version (Prism Crush White)
Amazon logo
$229.95
Samsung Galaxy A51 AmazonSamsung Galaxy A51 (128GB, 4GB) 6.5", 48...Samsung Galaxy A51 (128GB, 4GB) 6.5", 48MP Quad Camera, Dual SIM GSM Unlocked A515F/DS- Global 4G LTE International Model (Prism Crush White) (Renewed)
Amazon logo
$249.99
Samsung Galaxy A51 AmazonSamsung Galaxy A31 64GB / 4GB - A315G/DS...Samsung Galaxy A31 64GB / 4GB - A315G/DSL Unlocked Dual Sim Phone w/Quad Camera 48MP+8MP+5MP+5MP GSM International Version (Prism Crush Black)
Amazon logo
$222.48
Samsung Galaxy A51 walmartAT&T PREPAID Samsung Galaxy A51 5G 128GB...AT&T PREPAID Samsung Galaxy A51 5G 128GB, Prism Crush Black
walmart logo
$9.99

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