Samsung Galaxy A51 vs. Xiaomi Redmi Note 9S

Phone Comparison, Reviews and Tests

Side by side comparison and review of Samsung Galaxy A51 and Xiaomi Redmi Note 9S. Compare sizes, cameras, batteries, memory capacities and other key specifications and features to simplify the choice of your perfect phone. Our goal is to make it easier for you to decide on the phone that will best meet your expectations by revealing the main differences between the products.

Phone Specifications Comparison

Samsung Galaxy A51 vs. Xiaomi Redmi Note 9S Comparison Chart
DESIGN AND DIMENSIONS Samsung Galaxy A51 Xiaomi Redmi Note 9S
Product Type Smartphone Smartphone
Manufacturer Model Number SM-A515F/DSN -
Form Factor Touch Touch
Height 158.5 mm 165.75 mm Xiaomi Redmi Note 9S has greater height than Samsung Galaxy A51.
Width 73.6 mm 76.68 mm Xiaomi Redmi Note 9S has greater width than Samsung Galaxy A51.
Depth 7.9 mm 8.8 mm Samsung Galaxy A51 is narrower than Samsung Galaxy A51.
Weight 172 g 209 g Samsung Galaxy A51 is lighter than Samsung Galaxy A51.
Body Colour Silver | Prism crush black | Haze crush silver | Prism crush blue | Prism crush white Aurora blue
Body Material - Curved 3D glass, Gorilla glass 5
Protection - Dustproof, splashproof
Waterproof (Water-resistant) - -
SAR Value 0.369 W/kg (head), 1.59 W/kg (body), 2.93 W/kg (limb) 0.98 W/kg (body), 0.72 W/kg (head), 2.35 W/kg (limb)
Integrated Components - Ultra-linear speakers
Connector Type USB Type-C - 24 pin USB-C
Headset jack - mini-phone 3.5mm
USB Type-C - 24 pin USB-C
Headset jack - mini-phone 3.5mm
SIM Card Type (Size) Nano SIM Nano SIM
SIM Card Qty Dual-SIM Dual-SIM
SIM Card Configuration Details - Nano SIM + nano SIM/microSD
DISPLAY Samsung Galaxy A51 Xiaomi Redmi Note 9S
Display Type OLED display LCD display
Display Technology Super AMOLED -
Screen Size (Display Size) 6.5" 6.67" Xiaomi Redmi Note 9S has larger screen size than Samsung Galaxy A51.
Screen Resolution (Display Resolution) 2400 x 1080 pixels 2400 x 1080 pixels Both phones have the same screen resolution.
Display Format Full HD+ Full HD+
Pixel Density 408 ppi -
Colour Depth 16.7 million colours -
Contrast Ratio - 1500:1
HDR - Yes Xiaomi Redmi Note 9S has HDR.
Display Features Edge-to-Edge screen, Infinity O display Reading mode 2.0, Dot Display
Display Protection (Screen Protector) - Corning Gorilla Glass 5 (scratch resistant glass)
PROCESSOR Samsung Galaxy A51 Xiaomi Redmi Note 9S
Processor Type (CPU) Samsung Exynos 9611 Qualcomm Snapdragon 720G
Clock Speed 2.3 GHz 2.3 GHz Both phones have the same clock speed.
Processor Core Qty 8-core 8-core Both phones have the same number of phone cores.
64-bit Architecture Yes Yes Both phones have 64-bit architecture.
Graphics System (GPU) - Qualcomm ADRENO 618
MEMORY Samsung Galaxy A51 Xiaomi Redmi Note 9S
RAM 4 GB 4 GB Both phones have the same RAM size.
Internal Memory Size (Storage Capacity) 128 GB 64 GB Samsung Galaxy A51 has more internal memory than Xiaomi Redmi Note 9S.
User Memory 107 GB -
Supported Flash Memory Cards (Expandable Memory) microSDHC, microSDXC - up to 512 GB microSDHC, microSDXC - up to 512 GB
CAMERA Samsung Galaxy A51 Xiaomi Redmi Note 9S
MAIN CAMERA
Number of Main Cameras 4 4
Sensor Resolution 48 Megapixel 48 Megapixel Both phones have the same camera resolution.
Sensor Size - 1/2"
Lens Aperture F/2.0 F/1.79 Xiaomi Redmi Note 9S has better lens aperture than Samsung Galaxy A51.
Lens Construction - 6-element
Field of View (FoV) - 79 degree(s)
Pixel Size - 0.8 μm
Focus Adjustment Automatic Automatic
Digital Zoom 8x -
Special Effects - HDR, Kaleidoscope
Camera Modes Slow motion mode, Live Focus mode Burst mode, Panorama, night mode, Smart ultra-wide angle mode, Photo timer, Custom watermark, Documents, Beautify, Levelling, Cinematic portraits
Face Recognition (Face ID) - Face recognition Xiaomi Redmi Note 9S has face detection.
Light Source LED flash Dual LED flash
Still Image Resolutions - 8000 x 6000
Video Resolutions Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1920 x 1080 (1080p) at 120 fps, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps, Slo-mo video 1280 x 720 (720p) at 960 fps
Camera Features (Functions) AR sticker, background blur, Scene Optimiser, Eye blink, Flaw detection, Stamp, Facial blur 4-in-1 Super Pixel, AI scene detection, Portrait mode with background blurring, Ultra wide-angle edge distortion correction, Steady handheld night photography, full screen frame, AI watermark
SECOND CAMERA
Sensor Resolution (2nd Camera) 12 Megapixel 8 Megapixel Samsung Galaxy A51 has better second camera resolution than Xiaomi Redmi Note 9S.
Lens Type (2nd Camera) Ultra wide-angle lens Ultra wide-angle lens
Lens Aperture (2nd Camera) F/2.2 F/2.2 Both phones have the same second camera lens aperture.
Field of View (2nd Camera) 123 degree(s) 119 degree(s) Samsung Galaxy A51 has larger second camera lens field of view than Xiaomi Redmi Note 9S.
Pixel Size (2nd Camera) - 1.12 μm
THIRD CAMERA
Sensor Resolution (3rd Camera) 5 Megapixel 5 Megapixel Both phones have the same third camera resolution.
Lens Aperture (3rd Camera) F/2.4 F/2.4 Both phones have the same lens aperture of the third camera.
Pixel Size (3rd Camera) - 1.12 μm
Camera Functions (3rd Camera) Macro camera Macro camera
Camera Features (3rd Camera) - AF (2cm-10cm)
FOURTH CAMERA
Sensor Resolution (4th Camera) 5 Megapixel 2 Megapixel Samsung Galaxy A51 has higher resolution fourth camera than Xiaomi Redmi Note 9S.
Lens Type (4th Camera) Telephoto lens -
Lens Aperture (4th Camera) F/2.2 F/2.4 Samsung Galaxy A51 has better fourth camera lens aperture than Samsung Galaxy A51.
Pixel Size (4th Camera) - 1.75 μm
Camera Functions (4th Camera) Depth camera Depth camera
FRONT CAMERA
Number of Front Cameras 1 1
Sensor Resolution (Front) 32 Megapixel 16 Megapixel Samsung Galaxy A51 has better front camera resolution than Xiaomi Redmi Note 9S.
Lens Aperture (Front) F/2.2 F/2.48 Samsung Galaxy A51 has better front lens aperture than Samsung Galaxy A51.
Pixel Size (Front) - 1 μm
Focus Adjustment Focus free -
Special Effects (Front) - HDR
Camera Modes (Front) - Panoramic selfies, AI portrait mode, AI Beautify, Slo-mo Selfie
Face Recognition (Face ID) - Face recognition Xiaomi Redmi Note 9S has face detection.
Light Source (Front) - Display flash
Camera Features (Front) - AI scene detection, Palm shutter, AI silhouette detection
BATTERY AND CHARGING Samsung Galaxy A51 Xiaomi Redmi Note 9S
Battery Capacity (Battery Size) 4000 mAh 5020 mAh Xiaomi Redmi Note 9S has larger battery capacity than Samsung Galaxy A51.
Talk Time 1920 minutes 1980 minutes Xiaomi Redmi Note 9S has longer battery life when making calls than Samsung Galaxy A51.
Run Time Details Active online usage (LTE): up to 15 hrs
Active online usage (Wi-Fi): up to 16 hrs
Playback (video): up to 20 hrs
Playback (audio): up to 87 hrs
Talk (4G): up to 1920 min
Talk: up to 1980 min
Gaming: up to 13 hrs
Playback (Music): up to 147 hrs
Navigation: up to 16 hrs
Battery Technology Lithium Ion Lithium Ion
CELLULAR Samsung Galaxy A51 Xiaomi Redmi Note 9S
Technology WCDMA (UMTS) / GSM WCDMA (UMTS) / GSM
Mobile Broadband Generation 4G 4G Both phones have the same mobile network generation.
Operating System Android 10 -
User Interface One UI MIUI 10
Intelligent Assistant Bixby -
Payment Technology - Google Pay
Navigation GPS, GLONASS, BeiDou, Galileo GPS, A-GPS, GLONASS, BeiDou, Galileo
COMMUNICATIONS Samsung Galaxy A51 Xiaomi Redmi Note 9S
Data Transmission GPRS, EDGE, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE GPRS, EDGE, HSDPA, HSUPA, HSPA+, VoLTE, FDD-LTE, TDD-LTE
2G Band 850 GSM, 900 GSM, 1800 GSM, 1900 GSM 850 GSM, 900 GSM, 1900 GSM, 2100 GSM
3G UMTS Band Band 1, Band 2, Band 4, Band 5, Band 8 Band 1, Band 2, Band 4, Band 5, Band 8
3G UMTS Frequency 2100, 1900, 1700, 850, 900 2100, 1900, 1700, 850, 900
4G LTE Band Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 17, Band 20, Band 26, Band 28, Band 38, Band 40, Band 41, Band 66 Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40
4G LTE Frequency FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700c, FDD 700b, FDD 800 DD, FDD 850+, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300
Wireless Interface IEEE 802.11a/b/g/n/ac, ANT+ IEEE 802.11a/b/g/n/ac
Bluetooth Bluetooth 5.0 LE Bluetooth 5.0
Bluetooth Profiles HFP, HSP, OPP, PAN, A2DP, AVRCP, HID, SAP, PBAP, MAP, HOGP -
NFC Yes - Samsung Galaxy A51 has NFC reader for mobile payments.
Messaging Services SMS, MMS SMS, MMS
MEDIA Samsung Galaxy A51 Xiaomi Redmi Note 9S
Supported Digital Audio Standards WAV, WMA, AAC, AMR, MP3, FLAC, XMF, OGG, MIDI, M4A, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, MID WAV, AAC, AMR, MP3, FLAC, APE (Monkey's Audio), MP4
Supported Digital Video Standards MKV, FLV, AVI, WMV, ASF, 3GP, M4V, WebM, 3G2, MP4 MKV, XviD, M4V, MP4
Audio Amplifier - Smart PA
FEATURES Samsung Galaxy A51 Xiaomi Redmi Note 9S
Phone Functions Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert
Sensors Accelerometer, ambient light sensor, proximity sensor, gyro sensor, hall sensor, geomagnetic sensor Accelerometer, digital compass, gyro sensor, distance sensor, infrared (IR) sensor, In-screen ambient light sensor
Security Devices Fingerprint reader (under display) Face recognition, fingerprint reader (side)
Security Technology - A.I. face recognition
Additional Phone Features Fast Charging, Samsung KNOX, Bixby Vision, Game Booster, Bixby Routines Infrared remote control, AI face unlock, Qualcomm 5th generation AI Engine, Z-axis linear vibration motor
OTHERS Samsung Galaxy A51 Xiaomi Redmi Note 9S
Included Accessories Power adapter Protective cover, SIM card removal tool, USB-C cable, 18W charger
Compliant Standards - TUV Rheinland
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