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Xiaomi Redmi 9i vs Samsung Galaxy A31 vs Samsung Galaxy A51

Key Feature Comparison

5.9

Xiaomi Redmi 9i

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7

Samsung Galaxy A31

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6.9

Samsung Galaxy A51

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At a Glance

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Octa core, 2 GHz, Cortex A53

MediaTek Helio G25, PowerVR GE8320

Octa core (2 GHz, Dual core, Cortex A75 + 1.7 GHz, Hexa Core, Cortex A55)

MediaTek Helio P65, Mali-G52

Octa core (2.3 GHz, Quad core, Cortex A73 + 1.7 GHz, Quad core, Cortex A53)

Samsung Exynos 9 Octa 9611, Mali-G72 MP3

5000 mAh

Li-Polymer

5000 mAh

Li-ion, Fast, 15W

4000 mAh

Li-ion, Fast, 15W

16.59 cm (6.53 inch)

269 ppi

16.26 cm (6.4 inch)

411 ppi, FHD

16.51 cm (6.5 inch)

405 ppi, FHD

Single, 13MP

1920x1080 @ 30 fps, 1280x720 @ 30 fps

Quad, 48MP + 8MP + 5MP + 5MP

1920x1080 @ 30 fps

Quad, 48MP + 12MP + 5MP + 5MP

3840x2160 @ 30 fps

4G

Dual SIM, GSM+GSM

4G

Dual SIM, GSM+GSM

4G

Dual SIM, GSM+GSM

Detailed Specs

Screen Size

16.59 cm (6.53 inch)
16.26 cm (6.4 inch)
16.51 cm (6.5 inch)

Screen Type

IPS LCD
Super AMOLED
Super AMOLED

Screen Resolution

720 x 1600 pixels
1080 x 2400 pixels
1080 x 2400 pixels

Pixel Density

269 ppi
411 ppi
405 ppi

Aspect Ratio

20:09
20:09
20:09

Screen to Body Ratio

81.01%
84.92%
87.44%

Screen Design

Waterdrop notch
Waterdrop notch
Punch hole

Peak Brightness

270 nits
-
-

Screen Quality

-
FHD
FHD

Phone Variants

4GB 128GB, 4GB 64GB
6GB 128GB
8GB 128GB, 6GB 128GB

Expandable Storage

Yes
Yes
Yes

Expandable Storage Capacity

Yes, 512 GB
Yes, 512 GB
Yes, 512 GB

OTG Support

Yes
Yes
Yes

RAM Type

-
LPDDR4X
LPDDR4X

Sensors

Light sensor, Proximity sensor, Accelerometer, Compass
Light sensor, Proximity sensor, Accelerometer, Gyroscope
Light sensor, Proximity sensor, Accelerometer, Gyroscope

Operating System

Android v10 (Q)
Android v10 (Q)
Android v10 (Q)

GPU

PowerVR GE8320
Mali-G52
Mali-G72 MP3

Chipset

MediaTek Helio G25
MediaTek Helio P65
Samsung Exynos 9 Octa 9611

CPU

Octa core, 2 GHz, Cortex A53
Octa core (2 GHz, Dual core, Cortex A75 + 1.7 GHz, Hexa Core, Cortex A55)
Octa core (2.3 GHz, Quad core, Cortex A73 + 1.7 GHz, Quad core, Cortex A53)

Custom User Interface

MIUI
Samsung One UI
Samsung One UI

Clock Speed

2 GHz
2 GHz
2.3 GHz

Architecture

64 bit
64 bit
64 bit

Process Technology

12 nm
12 nm
10 nm

Battery Capacity

5000 mAh
5000 mAh
4000 mAh

Battery Removable

No
No
No

Battery Type

Li-Polymer
Li-ion
Li-ion

USB Type-C

No
Yes
Yes

Charger Type

-
Fast, 15W
Fast, 15W

Fast Charging

-
Yes
Yes

Announced On

9-Sep-20
24-Mar-20
5-Dec-19

Market Status

Available
Available
Available

Brand

Xiaomi
Samsung
Samsung

Model Number

MZB0813INMZB080SINMZB0817INMZB080UINMZB0BQIIN
SM-A315FZB1INS/SM-A315FZBWINS
SM-A515FZB1INS/SM-A515FZBWINS

Price Status

Confirmed
Confirmed
Confirmed

Price

Rs. 7,469
Rs. 17,999
Rs. 20,450

GPS

Yes A-GPS, Glonass
Yes A-GPS, Glonass
Yes A-GPS, Glonass

NFC

No
Yes
Yes

Network Support

4G
4G
4G

Bluetooth

Yes
Yes
Yes

3.5mm Audio Jack

Yes
Yes
Yes

SIM Size

SIM1: Nano, SIM2: Nano
SIM1: Nano, SIM2: Nano
SIM1: Nano, SIM2: Nano

Wi-Fi

Yes, Wi-Fi 802.11, a/b/g/n
Yes, Wi-Fi 802.11, ac/b/g/n/n 5GHz
Yes, Wi-Fi 802.11, ac/b/g/n/n 5GHz

Bluetooth Type

v5.0
v5.0
v5.0

Audio Jack

3.5 mm
3.5 mm
3.5 mm

SIM Slot(s)

Dual SIM, GSM+GSM
Dual SIM, GSM+GSM
Dual SIM, GSM+GSM

eSIM

No
No
No

Wi-Fi Features

Mobile Hotspot
Wi-Fi Direct, Mobile Hotspot
Wi-Fi Direct, Mobile Hotspot

VoLTE

Yes
Yes
Yes

SIM 1 Bands

4G Bands: TD-LTE 2300(band 40) / 2500(band 41), FD-LTE 2100(band 1) / 1800(band 3) / 900(band 8) / 850(band 5), 3G Bands: UMTS 1900 / 2100 / 850 / 900 MHz, 2G Bands: GSM 1800 / 1900 / 850 / 900 MHz, GPRS: Available, EDGE: Available...
4G Bands: TD-LTE 2600(band 38) / 2300(band 40) / 2500(band 41), FD-LTE 2100(band 1) / 1800(band 3) / 2600(band 7) / 900(band 8) / 700(band 28) / 1900(band 2) / 1700(band 4) / 850(band 5) / 700(band 13) / 700(band 17) / 800(band 20), 3G Bands: UMTS 19...
4G Bands: TD-LTE 2600(band 38) / 2300(band 40) / 2500(band 41), FD-LTE 2100(band 1) / 1800(band 3) / 2600(band 7) / 700(band 28) / 1900(band 2) / 1700(band 4) / 850(band 5) / 700(band 13) / 700(band 17) / 800(band 20) / 850(band 26), 3G Bands: UMTS 1...

SIM 2 Bands

4G Bands: TD-LTE 2300(band 40) / 2500(band 41), FD-LTE 2100(band 1) / 1800(band 3) / 900(band 8) / 850(band 5), 3G Bands: UMTS 1900 / 2100 / 850 / 900 MHz, 2G Bands: GSM 1800 / 1900 / 850 / 900 MHz, GPRS: Available, EDGE: Available...
4G Bands: TD-LTE 2600(band 38) / 2300(band 40) / 2500(band 41), FD-LTE 2100(band 1) / 1800(band 3) / 2600(band 7) / 900(band 8) / 700(band 28) / 1900(band 2) / 1700(band 4) / 850(band 5) / 700(band 13) / 700(band 17) / 800(band 20), 3G Bands: UMTS 19...
4G Bands: TD-LTE 2600(band 38) / 2300(band 40) / 2500(band 41), FD-LTE 2100(band 1) / 1800(band 3) / 2600(band 7) / 900(band 8) / 700(band 28) / 1900(band 2) / 1700(band 4) / 850(band 5) / 700(band 13) / 700(band 17) / 800(band 20) / 850(band 26), 3G...

Audio Features

-
Dolby Atmos
Dolby Atmos

FM Radio

-
Yes
-

Front Video Recording

1080p30fps
1920x1080 @ 30 fps
1920x1080 @ 30 fps

Front Camera Features

HDR
-
HDR

Front Camera Setup

Single, 5MP
Single, 20MP
Single, 32MP

Front Camera 1 Resolution

5 MP
20 MP
32 MP

Front Camera 1 Type

f/2.2 Primary Camera
f/2.2 Primary Camera
f/2.2 Primary Camera

Front Camera 1 Lens

1.12 micrometre pixel size
-
2.8" sensor size, 0.8 micrometre pixel size

Front Aperture

f/2.2
f/2.2
f/2.2

Front Flash

Yes, Screen flash
No
No

Weight

194 grams
185 grams
172 grams

Colors

Midnight Black, Sea Blue,Nature Green
Prism Crush Black, Prism Crush Blue, Prism Crush Red, Prism Crush White
Prism Crush White, Prism Crush Black, Prism Crush Pink, Prism Crush Blue

Build

Back Panel: Plastic
-
Back: Plastic

Dimensions

164.9 x 77.07 x 9 mm
159.3 x 73.1 x 8.6 mm
158.5 x 73.6 x 7.9 mm

SAR Value

Head: 0.528 W/kg, Body: 0.791 W/kg
Head: 1.13 W/kg
Head: 0.598 W/kg

Rear Flash

Yes, LED Flash
Yes, LED Flash
Yes, LED Flash

Rear Video Recording

1920x1080 @ 30 fps, 1280x720 @ 30 fps
1920x1080 @ 30 fps
3840x2160 @ 30 fps

Rear Camera Features

Digital Zoom, Auto Flash, Face detection, Touch to focus
8 x Digital Zoom, Auto Flash, Face detection, Touch to focus
8 x Digital Zoom, Auto Flash, Face detection, Touch to focus

Rear Camera Setup

Single, 13MP
Quad, 48MP + 8MP + 5MP + 5MP
Quad, 48MP + 12MP + 5MP + 5MP

Rear Camera 1 Resolution

13 MP
48 MP
48 MP

Rear Camera 1 Type

f/2.2 Primary Camera
f/2.0 (upto 8x Digital Zoom) Primary Camera
f/2.0 (upto 8x Digital Zoom) Primary Camera

Rear Camera 1 Lens

1 micrometre pixel size
26 mm focal length, 2" sensor size, 0.8 micrometre pixel size
26 mm focal length, 2.25" sensor size, 0.8 micrometre pixel size

Rear Aperture

f/2.2
f/2.0
f/2.0

OIS

-
No
No

Rear Camera 2 Resolution

-
8 MP
12 MP

Rear Camera 2 Type

-
f/2.2, Wide Angle, Ultra-Wide Angle Camera
f/2.2, Wide Angle, Ultra-Wide Angle Camera

Rear Camera 3 Resolution

-
5 MP
5 MP

Rear Camera 3 Type

-
f/2.4, Macro Camera
f/2.4, Macro Camera

Rear Camera 4 Resolution

-
5 MP
5 MP

Rear Camera 4 Type

-
f/2.4, Depth Camera
f/2.2, Depth Camera

Fingerprint Scanner

No
Yes
Yes

Face Unlock

Yes
Yes
Yes

Fingerprint Scanner Position

-
On-Screen
On-Screen

Fingerprint Scanner Type

-
Optical
Optical
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