test samsung S21

Full Samsung S21 test

Published Aug 18, 2023 - Arriving on the market in January 2021 as the successor to the S20 range, the Samsung S21 has already won over many users. After our test of the Samsung Galaxy S21 Ultra, we thought it only natural to tell you more about this top-of-the-range model from the Korean giant. Here's everything you need to know about this technological gem.

Samsung S21 technical data

The Samsung S21 has been on the market since January 29, 2021, along with the Samsung 21 Plus and Samsung S21 Ultra, one year before the release of the Samsung S21 FE on January 11, 2022.

Available in pink, light purple, white and black, the S21 is also a power monster. Here's the full specs:


Android 11


Samsung Exynos 2100

Number of cores


Graphics chip

ARM Mali G78 MP14

Random Access Memory (RAM)

8 GB


256 GB

Index of protection (waterproofing)


Dual SIM


Screen size (diagonal)



7.13 cm


15.17 cm


0.81 cm


172 g

Display technology


Refresh rate

120 Hz

Screen definition

2400 x 1080 px

Screen resolution

424 dpi

NFC support


Bluetooth support

Yes (version 5.2)

USB connector type

USB Type-C

Jac connector


Main photo sensor

64 MP

Second photo sensor

12 Mpx

Third photo sensor

12 MP



ToF sensor


Front sensor

Yes (10 MP for front sensor 1)

Video recording (main)

7680 x 4320 px

4G network compatible (LTE)


5G network compatible


Removable battery


Battery capacity

4000 mAh

Wireless charging


Samsung S21 highlights

  • Excellent performance ;

  • Beautiful, correctly calibrated screen ;

  • Elegant design ;

  • Pleasant finish;

  • Photo and video ;

  • Waterproof for 30 minutes at a depth of 1.5 meters.

Samsung S21 weaknesses

  • Night photos are rather disappointing;

  • Autonomy could be better;

  • No charging block.

If you'd like to find out more about the Samsung S21, the rest of this article goes into detail about its different features.

Samsung S21 design and ergonomics

Presented in a rather plain format, the Samsung S21 boasts a handsome 6.2" Oled screen. In terms of aesthetics, a rather imposing integrated photo unit extends from the right-hand side of the device. Although its thickness may unbalance the smartphone when laid flat without a shell, it's clear that Samsung has pulled out all the stops to offer an attractive high-end model.

The glass that usually covers the back of phones has been replaced here by a plastic compound that doesn't look out of place, and the edges are still made of aluminum. With dimensions of 151.7 x 71.2 x 7.9 mm and a weight of 169 grams, it's easy to handle. Unlike the Samsung Galaxy S21 Ultra with its curved edges, the S21 has a completely flat slab. With a front-facing camera housed in a discreet notch, the screen takes up the lion's share of the front. On the lower edge of the device, you'll find the USB-C port, a speaker grille and a slot specially designed for inserting 2 SIM cards. For this model, Samsung has chosen not to include a slot for a microSD, so the internal memory capacity cannot be modified. You'll find it in 128 or 256 GB.

A very good screen

Like the S21 Ultra's panel, this model's also boasts excellent qualities. Featuring a handsome 6.2" FHD+ screen, the S21 boasts a 120 Hz adaptive refresh rate and an almost infinite contrast ratio. The only downside is maximum brightness. While that of the S21 Ultra reaches 999 cd/m², that of the S21 doesn't exceed 862 cd/m². This does not prevent it from being ideal for daytime use.

Convincing performance for the Samsung Galaxy S21

Like the Galaxy S21 Ultra, the S21's processor is the Samsung Exynos 2100, making it one of the most powerful phones on the market today. Ideal for games, with a rating of up to 112, it also boasts optimal multitasking with a rating of 97, as well as perfect fluidity.