Samsung Galaxy M21 vs Xiaomi Redmi Note 9S: specs comparison

Key differences

Calculated from recorded specifications using minimum difference thresholds. These are differences, not an overall ranking. For three phones, numeric highlights compare the two extremes.

Display technology

OLED versus LCD

Galaxy M21:

OLED

Redmi Note 9S:

LCD
Weight

Galaxy M21: 21 g lighter

Galaxy M21:

188 g

Redmi Note 9S:

209 g
Width

Galaxy M21: 1.6 mm narrower

Galaxy M21:

75.1 mm

Redmi Note 9S:

76.7 mm
Screen diagonal

Galaxy M21: 0.27 in smaller diagonal

Galaxy M21:

6.4 in

Redmi Note 9S:

6.67 in
Chipset

Galaxy M21:

Exynos 9611 (10nm)

Redmi Note 9S:

Qualcomm SM7125 Snapdragon 720G (8 nm)
Rear camera layout

Galaxy M21:

Triple

Redmi Note 9S:

Quad

Physical size

Relative size, not calibrated actual size. Front and side outlines share one scale and a bottom baseline. Generic outlines use recorded body dimensions, excluding camera bumps.

1. Galaxy M21

Height:

159 mm
Width:

75.1 mm
Depth:

8.9 mm
2. Redmi Note 9S

Height:

165.8 mm +6.8 mm versus Galaxy M21
Width:

76.7 mm +1.6 mm versus Galaxy M21
Depth:

8.8 mm

Weight

Bars start at zero and share a scale within this chart.

1. Galaxy M21

188 g
2. Redmi Note 9S

209 g

+21 g versus Galaxy M21

Screen size

Approximate rectangular screens calculated from recorded diagonal and aspect ratio at one relative scale. Rounded corners and cutouts are not subtracted. These are not phone outlines or calibrated actual sizes.

1. Galaxy M21

Screen diagonal:

6.4 in

Aspect ratio (height:width):

19.5:9

Approximate rectangular screen area:

100.5 cm²
2. Redmi Note 9S

Screen diagonal:

6.67 in

Aspect ratio (height:width):

20:9

Approximate rectangular screen area:

107.4 cm²

Redmi Note 9S has approximately 6.8% more rectangular screen area than Galaxy M21.

Memory variants

Each row compares the same storage capacity. Cells show recorded RAM alternatives, not combined maxima. Not recorded does not mean unavailable in every market.

Recorded RAM for Galaxy M21, Redmi Note 9S, compared at the same storage capacity.
Storage	Galaxy M21	Redmi Note 9S
64 GB Recorded for all phones	4 GB RAM	4 GB RAM
128 GB Recorded for all phones	6 GB RAM	6 GB RAM

Practical features

Explicit Yes and No values are shown directly. Qualified or regional records retain their details. Unknown means the record is missing.

1. Galaxy M21

NFC:: Unknown
Headphone jack:: Yes
Memory card support:: See details microSDXC (dedicated slot)

2. Redmi Note 9S

NFC:: Unknown
Headphone jack:: Yes
Memory card support:: See details microSDXC (dedicated slot)

Battery capacity

Capacity is not battery life. No endurance test is implied.

Recorded battery capacity

Bars start at zero and share a scale within this chart.

1. Galaxy M21

6000 mAh

+980 mAh versus Redmi Note 9S
2. Redmi Note 9S

5020 mAh

Specifications

Open a section for more detail. On narrow screens, swipe sideways or use Left/Right arrow keys while the table is focused. Unknown means missing data, not No. Recorded zero values are shown as recorded.

1. Galaxy M212. Redmi Note 9S

Everyday essentials

Everyday essentials — specifications for Galaxy M21, Redmi Note 9S.
Specification	Galaxy M21	Redmi Note 9S
Dimensions (HxWxD)	159 Х 75.1 Х 8.9 mm	165.8 Х 76.7 Х 8.8 mm
Weight	188 g	209 g
Technology	Super AMOLED	IPS LCD
Screen size	6.4" inch	6.67" inch
Screen resolution	1080 x 2340 px	1080 x 2400 px
Internal memory Recorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.	64GB 4GB RAM 128GB 6GB RAM	64GB 4GB RAM 128GB 6GB RAM
Memory card support	microSDXC (dedicated slot)	microSDXC (dedicated slot)
Battery Capacity is not battery life. No endurance test is implied.	6000 mAh Non-removable Li-Po	5020 mAh Non-removable Li-Po
Operating system OS	Android 10.0; One UI 2	Android 10.0; MIUI 11
Chipset	Exynos 9611 (10nm)	Qualcomm SM7125 Snapdragon 720G (8 nm)
Headphone jack	Yes	Yes

Display

Display — specifications for Galaxy M21, Redmi Note 9S.
Specification	Galaxy M21	Redmi Note 9S
Touchscreen	capacitive touchscreen	capacitive touchscreen
Display colors	16M	16M
Screen area	100.5 cm2	107.4 cm2
Screen format	19.5:9 (height:width)	20:9 (height:width)
Screen to body ratio	84.2%	84.5%
PPI /points per inch/	403 PPI	395 PPI
Screen protection	Corning Gorilla Glass 3	Corning Gorilla Glass 5

Camera and Video

Camera and Video — specifications for Galaxy M21, Redmi Note 9S.
Specification	Galaxy M21	Redmi Note 9S
Rear camera, main	48 MP Triple	48 MP Quad
Camera specs	48 MP f/2.0 26mm (wide) 1/2.0'' 0.8µm PDAF -8 MP f/2.2 12mm (ultrawide) 1/4.0'' 1.12µm -5 MP (depth)	48 MP f/1.8 26mm (wide) 1/2.0'' 0.8µm PDAF -8 MP f/2.2 13mm (ultrawide) 1/4.0'' 1.12µm -5 MP f/2.4 (macro) 1.12µm -2 MP (depth)
Functions	HDR	HDR panorama
Video	1080p@30fps	1080p@30fps
Front camera, selfie	20 MP Single	16 MP Single
Specifications	20 MP f/2.0 26mm (wide)	16 MP f/2.5 (wide) 1.0µm

Performance

Scores marked * are historical catalogue entries. Test conditions are unspecified; no new testing is implied.

Performance — specifications for Galaxy M21, Redmi Note 9S.
Specification	Galaxy M21	Redmi Note 9S
Processor CPU	Octa-core (4x2.3 GHz Cortex-A73 & 4x1.7 GHz Cortex-A53)	Octa-core (2x2.3 GHz Kryo 465 Gold & 6x1.8 GHz Kryo 465 Silver)
Graphics processor GPU	Mali-G72 MP3	Adreno 618
Antutu 8 score *	182451	Unknown

General specs

General specs — specifications for Galaxy M21, Redmi Note 9S.
Specification	Galaxy M21	Redmi Note 9S
Release date	2020 March 18	2020 March 23
Colors	Midnight Blue Raven Black	Aurora Blue Glacier white Interstellar Gray
Historical recorded price Legacy catalogue value; date unknown. Not a current offer.	160 EUR	$ 199
Body build	Glass front (Gorilla Glass 3) plastic back plastic frame	Glass front (Gorilla Glass 5) glass back (Gorilla Glass 5) plastic frame

Communication and Connectivity

Communication and Connectivity — specifications for Galaxy M21, Redmi Note 9S.
Specification	Galaxy M21	Redmi Note 9S
SIM card	Dual SIM (Nano-SIM dual stand-by)	Dual SIM (Nano-SIM dual stand-by)
Network	Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 -3G - HSDPA 850 / 900 / 1900 / 2100 -4G - LTE band 1(2100) 3(1800) 5(850) 7(2600) 8(900) 20(800) 38(2600) 40(2300) 41(2500)	Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 -3G - HSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 -4G - LTE band 1(2100) 2(1900) 3(1800) 4(1700/2100) 5(850) 7(2600) 8(900) 20(800) 28(700) 38(2600) 40(2300)
Speed	HSPA LTE-A	HSPA 42.2/5.76 Mbps LTE-A
GPRS	Yes	Yes
Edge	Yes	Yes
Wi-Fi	Wi-Fi 802.11 a/b/g/n/ac dual-band Wi-Fi Direct hotspot	Wi-Fi 802.11 a/b/g/n/ac dual-band Wi-Fi Direct hotspot
GPS	Yes with A-GPS GLONASS BDS	Yes with A-GPS GLONASS GALILEO BDS
USB	2.0 Type-C 1.0 reversible connector	2.0 Type-C 1.0 reversible connector
Bluetooth	5.0 A2DP LE	5.0 A2DP LE
Harmful irradiation	SAR - 0.47 W/kg (head)	Unknown

Music and Audio

Music and Audio — specifications for Galaxy M21, Redmi Note 9S.
Specification	Galaxy M21	Redmi Note 9S
Radio	FM radio RDS recording	FM radio recording
Others	420 nits max brightness	450 nits typ. brightness (advertised)

Other features

Other features — specifications for Galaxy M21, Redmi Note 9S.
Specification	Galaxy M21	Redmi Note 9S
Dop	Sensors Fingerprint (rear-mounted) accelerometer gyro proximity compass - Fast charging 15W	Sensors Fingerprint (side-mounted) accelerometer gyro proximity compass Infrared port - Fast charging 18W - Splash-proof

Samsung Galaxy M21 vs Xiaomi Redmi Note 9S