Redmi Note 9 vs Galaxy A51: Which Should You Buy?

Xiaomi launched Redmi Note 9 to rival mid-range mobile phones like Samsung’s Galaxy A51. The smartphones are similar in terms of technical specifications, such as a quad camera, 6.5″ screen, and Full HD+ resolution. However, they differ in battery capacity and processor. Check below the comparison of specifications of the devices and know which may be the best choice.

Redmi Note 9 vs Galaxy A51 Datasheet

Redmi Note 9Galaxy A51
LaunchApril 2020January 2020
Current price$200$270
Screen6.5 inches6.5 inches
Screen resolutionFull HD + (2340 x 1080 pixels)Full HD + (2400 x 1080 pixels)
ProcessorMediaTek Helio G85Exynos 9611
Storage64/128 GB128 GB
Memory cardMicroSD up to 512 GBMicroSD up to 512 GB
Main cameraQuad camera: 48MP, 8MP, 2MP and 2MPQuad camera: 48MP, 12MP, 5MP and 5 MP
Front Camera13 MP32 MP
Operating systemAndroid 10Android 10
Battery5,020 mAh4,000 mAh
Dimensions and weight162.3 x 77.2 x 8.9 mm; 199 g158.5 x 73.6 x 7.9 mm; 172 g
ColorsGray, Green, and WhiteBlue, Black, and White
Source: Xiaomi and Samsung

Screen and Design

Redmi Note 9

The screen size is the same in both smartphones, but the panel is the first point where Smartphones differ. While Xiaomi’s phone brings LCD technology, Samsung uses a Super AMOLED display, considered the best.

Also, Redmi Note 9 places the front camera in a hole in the left corner of the screen, while the Galaxy A51 houses the sensor at the top in a centralized manner. In the back, the quad set is accommodated centrally in Xiaomi’s device, while Samsung’s has its lens in a rectangle on the left side of the phone.

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Besides, Redmi Note 9 has a fingerprint sensor on the back. The Galaxy A51, on the other hand, performs this function using a reader integrated into the mobile’s screen.


Galaxy A51 Camera

Both mobile phones have a quad camera. However, the differences start at the front camera sensor, which is 13 Megapixels in Redmi Note 9 and 32 MP in Galaxy A51.

In the rear, the main one is 48 MP in the two phones, but it is 8, 2, and 2 MP in Xiaomi’s device, which has ultra-wide, macro, and telephoto cameras, respectively. The Galaxy A51 has an ultra-wide, macro, and depth sensor, being 12, 5, and 5 MP. Both devices also offer portrait mode, a famous feature that blurs the image background.

Performance and Storage

Redmi Note 9
Galaxy A51

The processor of the Galaxy A51 is the Exynos 9611, an octa-core up to 2.3 GHz. Meanwhile, Redmi Note 9 features MediaTek’s Helio G85, also an eight-core chip, but with speeds up to 2 GHz.

Regarding storage, the Redmi has versions of 64 GB or 128 GB of data space, and also options with RAM of 3 GB or 4 GB. The Galaxy A51 features a single version with 128 GB of storage and 4 GB of RAM. Both still have the possibility of expansion using a microSD memory card.



The battery capacity is one of the highlights of the Redmi Note 9. Xiaomi’s device has a gross capacity of 5,020 mAh. The Chinese giant promises up to 16 continuous hours of games and 147 hours of music playback.

The Galaxy A51 has much less: 4,000 mAh of battery, with a promise of 16 continuous hours of internet surfing and 20 hours of video playback, according to Samsung.

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Redmi Note 9 brings fast recharging through Fast Charge 3 technology with 18 W power chargers. The Galaxy A51 also offers fast recharging through a 15 W source.

Android Version

Android 10

Both devices have already run Android 10. The difference between them is the interface since the Galaxy A51 uses the One UI, a customized version by the company, and Redmi Note 9 adopts Xiaomi’s MIUI 11.

Additional Features

Redmi Note 9 features a coating that offers splash resistance and is certified to ensure lower levels of blue screen light emission. Samsung also allows the user to reduce blue light. The South Korean mobile also brings Bixby, Samsung’s virtual assistant.

NFC, a function that allows proximity payments, is only available for the Galaxy A51. However, Redmi Note 9 offers a scanner to scan documents. Features such as USB-C input for chargers and the 3.5 mm headphone connector are present in both the Redmi Note 9 and the Galaxy A51.

Price and Availability

Redmi Note 9 was launched globally in April 2020 and it can be found at the Amazon store for $200 with the option of 4GB of RAM and 128GB of storage.

The Galaxy A51 is currently available on Amazon for a price starting from $270.

This post may contain affiliate links, which means that I may receive a commission if you make a purchase using these links. As an Amazon Associate, I earn from qualifying purchases.


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