Samsung Galaxy A21 vs Xiaomi Redmi Note 4G: 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 A21:

OLED

Redmi Note 4G:

LCD
Screen diagonal

Redmi Note 4G: 1 in smaller diagonal

Galaxy A21:

6.5 in

Redmi Note 4G:

5.5 in
Rear camera layout

Galaxy A21:

Quad

Redmi Note 4G:

Single
Release year

Galaxy A21:

2020

Redmi Note 4G:

2016

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 A21

Height:

Unknown
Width:

Unknown
Depth:

Unknown

Weight:

Unknown

Unavailable dimensions are omitted from the drawing.
2. Redmi Note 4G

Height:

151 mm
Width:

76 mm
Depth:

8.4 mm

Weight:

175 g

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 A21

Screen diagonal:

6.5 in

Aspect ratio (height:width):

20:9

Approximate rectangular screen area:

102 cm²
2. Redmi Note 4G

Screen diagonal:

5.5 in

Aspect ratio (height:width):

16:9

Approximate rectangular screen area:

83.4 cm²

Galaxy A21 has approximately 22.3% more rectangular screen area than Redmi Note 4G.

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 A21, Redmi Note 4G, compared at the same storage capacity.
Storage	Galaxy A21	Redmi Note 4G
32 GB	3 GB RAM	Unknown

Redmi Note 4G: Original memory entry

16 GB · 2 GB RAM - Standard edition64 GB · 3 GB RAM - High edition64 GB · 4 GB RAM - Exclusive

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 A21

NFC:: See details Yes (market/region dependent)
Headphone jack:: Yes
Memory card support:: See details microSDXC (dedicated slot)

2. Redmi Note 4G

NFC:: Unknown
Headphone jack:: Yes
Memory card support:: See details microSD · up to 256 GB (uses SIM 2 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 A21

4000 mAh
2. Redmi Note 4G

4100 mAh

+100 mAh versus Galaxy A21

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 A212. Redmi Note 4G

Everyday essentials

Everyday essentials — specifications for Galaxy A21, Redmi Note 4G.
Specification	Galaxy A21	Redmi Note 4G
Dimensions (HxWxD)	Х Х mm	151 Х 76 Х 8.4 mm
Weight	0 g	175 g
Technology	Super AMOLED	IPS LCD
Screen size	6.5" inch	5.5" inch
Screen resolution	720 x 1600 px	1080 x 1920 px
Internal memory Recorded storage / RAM variants. Entries are alternatives, not a combined maximum. Ambiguous formats stay as recorded.	32GB 3GB RAM	16 GB 2 GB RAM - Standard edition64 GB 3 GB RAM - High edition64 GB 4 GB RAM - Exclusive
Memory card support	microSDXC (dedicated slot)	microSD up to 256 GB (uses SIM 2 slot)
Battery Capacity is not battery life. No endurance test is implied.	4000 mAh Non-removable Li-Po	4100 mAh Non-removable Li-Po
Operating system OS	Android 10.0; One UI 2.0	Android 6.0 (Marshmallow); MIUI 10
Chipset	Unknown	Mediatek MT6797 Helio X20 (20 nm)
NFC	Yes (market/region dependent)	Unknown
Headphone jack	Yes	Yes

Display

Display — specifications for Galaxy A21, Redmi Note 4G.
Specification	Galaxy A21	Redmi Note 4G
Touchscreen	capacitive touchscreen	capacitive touchscreen
Display colors	16M	16M
Screen area	102.0 cm2	83.4 cm2
Screen format	20:9 (height:width)	16:9 (height:width)
Screen to body ratio	Unknown	72.7%
PPI /points per inch/	270 PPI	401 PPI

Camera and Video

Camera and Video — specifications for Galaxy A21, Redmi Note 4G.
Specification	Galaxy A21	Redmi Note 4G
Rear camera, main	16 MP Quad	13 MP Single
Camera specs	16 MP (wide) AF -8 MP (ultrawide) -2 MP (macro) -2 MP (depth)	13 MP PDAF f/2.0
Functions	LED flash panorama HDR	Dual-LED dual-tone flash HDR panorama
Video	1080p@30fps	720p
Front camera, selfie	13 MP Single	5 MP Single
Specifications	13 MP (wide)	5 MP f/2.0

Performance

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

Performance — specifications for Galaxy A21, Redmi Note 4G.
Specification	Galaxy A21	Redmi Note 4G
Processor CPU	Unknown	Deca-core 2.1 GHz
Graphics processor GPU	Unknown	Mali-T880 MP4
Antutu 7 score *	Unknown	21789

General specs

General specs — specifications for Galaxy A21, Redmi Note 4G.
Specification	Galaxy A21	Redmi Note 4G
Release date	2020 April 8	2016 August
Colors	Black	Silver Gray Gold Blue Black
Historical recorded price Legacy catalogue value; date unknown. Not a current offer.	250 EUR	170 EUR
Body build	Glass front plastic back plastic frame	Front glass aluminum body

Communication and Connectivity

Communication and Connectivity — specifications for Galaxy A21, Redmi Note 4G.
Specification	Galaxy A21	Redmi Note 4G
SIM card	Single SIM (Nano-SIM)Dual SIM (Nano-SIM dual stand-by)	Hybrid Dual SIM (Micro-SIM/Nano-SIM dual stand-by)
Network	Show all network frequencies: -2G - GSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM only) -3G - HSDPA 850 / 900 / 1900 / 2100 HSDPA 850 / 1700(AWS) / 1900 / 2100 -4G - LTE	Show all network frequencies: -2G - GSM 900 / 1800 / 1900 - SIM 1 & SIM 2 CDMA 800 & TD-SCDMA -3G - HSDPA 850 / 900 / 1900 / 2100 -4G - LTE band 1(2100) 3(1800) 5(850) 7(2600) 8(900) 38(2600) 39(1900) 40(2300) 41(2500)
Speed	HSPA 42.2/5.76 Mbps LTE Cat4 150/50 Mbps	HSPA LTE
GPRS	Yes	Yes
Edge	Yes	Yes
Wi-Fi	Wi-Fi 802.11 b/g/n Wi-Fi Direct hotspot	Wi-Fi 802.11 a/b/g/n/ac dual-band WiFi Direct hotspot
GPS	Yes with A-GPS GLONASS BDS	Yes with A-GPS GLONASS BDS
USB	Yes	microUSB 2.0 USB On-The-Go
Bluetooth	5.0 A2DP LE	4.2 A2DP LE

Music and Audio

Music and Audio — specifications for Galaxy A21, Redmi Note 4G.
Specification	Galaxy A21	Redmi Note 4G
Radio	FM radio	FM radio
Others	Unknown	24-bit/192kHz audio -Active noise cancellation with dedicated mic

Other features

Other features — specifications for Galaxy A21, Redmi Note 4G.
Specification	Galaxy A21	Redmi Note 4G
Dop	Sensors Fingerprint (rear-mounted) accelerometer proximity compass - Fast charging 15W - Preliminary specifications	Sensors Fingerprint (rear-mounted) accelerometer gyro proximity compass Infrared port - For China

Samsung Galaxy A21 vs Xiaomi Redmi Note 4G