Samsung Galaxy A21s vs. OPPO Reno4 5G

Phone Comparison, Reviews and Tests

In depth comparison and review of Samsung Galaxy A21s and OPPO Reno4 5G. Compare sizes, cameras, batteries, memory, and other important specifications and features to easily choose the right phone for you. Our goal is to help you uncover differences between the products and find the phone that will best fit your needs.

Phone Specifications Comparison

Samsung Galaxy A21s vs. OPPO Reno4 5G Comparison Chart
DESIGN AND DIMENSIONS Samsung Galaxy A21s OPPO Reno4 5G
Product Type Smartphone Smartphone
Manufacturer Model Number SM-A217F/DSN CPH2091
Form Factor Touch Touch
Height 163.7 mm 159.3 mm Samsung Galaxy A21s has greater height than OPPO Reno4 5G.
Width 75.3 mm 74 mm Samsung Galaxy A21s has greater width than OPPO Reno4 5G.
Depth 8.9 mm 7.8 mm OPPO Reno4 5G is narrower than Samsung Galaxy A21s.
Weight 192 g 183 g OPPO Reno4 5G is lighter than Samsung Galaxy A21s.
Body Colour White | Blue | Black Space black | Galactic blue
Waterproof (Water-resistant) - -
IP rating - IP54
SAR Value 1.544 W/kg (body), 0.422 W/kg (head), 2.21 W/kg (limb) 0.886 W/kg (head), 1.155 W/kg (body), 2.165 W/kg (limb)
Connector Type USB Type-C - 24 pin USB-C
Headset jack - mini-phone 3.5mm
USB Type-C - 24 pin USB-C
SIM Card Type (Size) Nano SIM Nano SIM
SIM Card Qty Dual-SIM Dual-SIM
DISPLAY Samsung Galaxy A21s OPPO Reno4 5G
Display Type LCD display OLED display
Display Technology PLS TFT AMOLED
Screen Size (Display Size) 6.5" 6.4" Samsung Galaxy A21s has larger screen size than OPPO Reno4 5G.
Screen Resolution (Display Resolution) 1600 x 720 pixels 2400 x 1080 pixels OPPO Reno4 5G has better screen resolution than Samsung Galaxy A21s.
Display Format HD+ Full HD+
Pixel Density - 409 ppi
Aspect Ratio 20:9 20:9
Max Brightness - 800 cd/m²
Colour Depth 16.7 million colours 16.7 million colours Both phones have the same color depth.
Contrast Ratio - 800000:1
Display Refresh Rate - 60 Hz
Display Features Infinity O display DCI-P3 Wide colour gamut, Dark mode, 180Hz sampling rate
Display Protection (Screen Protector) - Corning Gorilla Glass (scratch resistant glass)
PROCESSOR Samsung Galaxy A21s OPPO Reno4 5G
Processor Type (CPU) - Qualcomm Snapdragon 765G
Clock Speed 2 GHz 2.4 GHz OPPO Reno4 5G has higher clock speed than Samsung Galaxy A21s.
Processor Core Qty 8-core 8-core Both phones have the same number of phone cores.
Graphics System (GPU) - Qualcomm ADRENO 620
MEMORY Samsung Galaxy A21s OPPO Reno4 5G
RAM 3 GB LPDDR4X SDRAM - 8 GB OPPO Reno4 5G has more RAM than Samsung Galaxy A21s.
Internal Memory Size (Storage Capacity) 32 GB 128 GB OPPO Reno4 5G has more internal memory than Samsung Galaxy A21s.
User Memory 19.5 GB -
Memory Interface - UFS 2.1
Supported Flash Memory Cards (Expandable Memory) microSDHC, microSDXC - up to 512 GB -
CAMERA Samsung Galaxy A21s OPPO Reno4 5G
MAIN CAMERA
Number of Main Cameras 4 3
Sensor Resolution 48 Megapixel 48 Megapixel Both phones have the same camera resolution.
Sensor Size - 1/2"
Sensor Name - Sony Exmor RS IMX586 sensor
Lens Type Wide-angle lens -
Lens Aperture F/2.0 F/1.7 OPPO Reno4 5G has better lens aperture than Samsung Galaxy A21s.
Lens Construction - 6-element
Field of View (FoV) 80 degree(s) -
Pixel Size - 0.8 μm
Focus Adjustment Automatic Automatic
Laser Auto Focus - Yes
Minimum Focal Length (Focal Distance) - 26 mm
Digital Zoom 8x -
Special Effects - HDR, Bokeh effect
Camera Modes Live Focus mode Time-lapse mode, night mode, Expert Mode, Text, AI Beautify, AI Portait, Pano mode, Dazzle Colour Mode
Light Source LED flash LED flash
Still Image Resolutions - 8000 x 6000
Video Resolutions 1920 x 1080 (1080p) 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, 1280 x 720 (720p) at 60 fps
Camera Features (Functions) Live Focus Noise reduction, Phase Detect Auto-Focus (PDAF), Electronic Image Stabiliser (EIS), Closed loop processing, 4-in-1 Pixel technology, Ultra Steady Video, contrast detection auto-focus (CDAF), laser detection auto focus (LDAF)
SECOND CAMERA
Sensor Resolution (2nd Camera) 8 Megapixel 8 Megapixel Both phones have the same second camera resolution.
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.
Lens Element Qty (2nd Camera) - 5-element
Field of View (2nd Camera) 123 degree(s) 119 degree(s) Samsung Galaxy A21s has larger second camera lens field of view than OPPO Reno4 5G.
Minimum Focal Length (2nd Camera) - 16 mm
Camera Functions (2nd Camera) - Monochrome
Camera Modes (2nd Camera) - Ultra Night Mode 3.0
Camera Features (2nd Camera) - 5-piece lens, Ultra Steady Video Pro
THIRD CAMERA
Sensor Resolution (3rd Camera) 2 Megapixel 2 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.
Lens Element Qty (3rd Camera) - 3-element
Camera Functions (3rd Camera) Macro camera -
Camera Features (3rd Camera) 4cm macro photography -
FOURTH CAMERA
Sensor Resolution (4th Camera) 2 Megapixel -
Lens Aperture (4th Camera) F/2.4 -
Camera Functions (4th Camera) Depth camera -
FRONT CAMERA
Number of Front Cameras 1 2
Sensor Resolution (Front) 13 Megapixel 32 Megapixel OPPO Reno4 5G has better front camera resolution than Samsung Galaxy A21s.
Sensor Name (Front) - Sony Exmor RS IMX616 sensor
Lens Aperture (Front) F/2.2 F/2.4 Samsung Galaxy A21s has better front lens aperture than Samsung Galaxy A21s.
Lens Element Qty (Front) - 5-element
Pixel Size (Front) - 0.8 μm
Focus Adjustment Focus free -
Camera Modes (Front) - Panorama, Time-lapse mode, Slow motion mode, night mode, Expert Mode, AI Beauty, Portrait
Light Source (Front) - Display flash
Still Image Resolutions (Front) - 6560 x 4928
Video Resolutions (Front) - 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps
Camera Features (Front) - Electronic Image Stabiliser (EIS), 5P lens
SECOND FRONT CAMERA
Sensor Resolution (2nd Front) - 2 Megapixel
Lens Aperture (2nd Front) - F/2.4
Pixel Size (2nd Front) - 1.75 μm
Camera Functions (2nd Front) - Portait camera
Camera Features (2nd Front) - 3-piece lens
BATTERY AND CHARGING Samsung Galaxy A21s OPPO Reno4 5G
Battery Capacity (Battery Size) 5000 mAh 4020 mAh Samsung Galaxy A21s has larger battery capacity than OPPO Reno4 5G.
Fast Charging Technology - SuperVOOC 2.0 Flash Charge OPPO Reno4 5G has fast charging technology.
Recharge Time (Charging Time) - 36 min
Standby Time - 390 hours
Talk Time 3240 minutes 1560 minutes Samsung Galaxy A21s has longer battery life when making calls than OPPO Reno4 5G.
Run Time Details Active online usage (4G): up to 23 hrs
Active online usage (Wi-Fi): up to 23 hrs
Playback (video): up to 21 hrs
Playback (audio): up to 109 hrs
Talk (4G): up to 3240 min
Standby: up to 390 hrs
Talk: up to 1560 min
Playback (Music): up to 37 hrs
Playback (video): up to 17.1 hrs
Battery Technology Lithium Ion -
CELLULAR Samsung Galaxy A21s OPPO Reno4 5G
Technology WCDMA (UMTS) / GSM WCDMA (UMTS) / GSM
Mobile Broadband Generation 4G 5G OPPO Reno4 5G has more advanced generation mobile network.
Operating System - ColorOS 7.2 (based on Android 10)
User Interface One UI -
Navigation GPS, GLONASS, BeiDou, Galileo GPS, A-GPS, GLONASS, BeiDou, Galileo, QZSS
COMMUNICATIONS Samsung Galaxy A21s OPPO Reno4 5G
Data Transmission GPRS, EDGE, HSDPA, HSUPA, HSPA+, FDD-LTE, TDD-LTE FDD-LTE, TDD-LTE, 5G NR FR1
2G Band 850 GSM, 900 GSM, 1800 GSM, 1900 GSM 850 GSM, 900 GSM, 1800 GSM, 1900 GSM
3G UMTS Band Band 1, Band 2, Band 5, Band 8 Band 1, Band 2, Band 4, Band 5, Band 6, Band 8, Band 19
3G UMTS Frequency 2100, 1900, 850, 900 2100, 1900, 1700, 850, 800, 900, 800
4G LTE Band Band 1, Band 2, Band 3, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40, Band 41 Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 17, Band 18, Band 19, Band 20, Band 26, Band 28, Band 32, Band 38, Band 39, Band 40, Band 41, Band 66
4G LTE Frequency FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500 FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 850+, FDD 700 APT, FDD 1500 L, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3
5G NR Band - N1, n3, n5, n7, n8, n20, n28, n38, n41, n77, n78, n40
5G NR Frequency - FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, TDD TD 3700, TDD TD 3500, TDD 2300
Wireless Interface IEEE 802.11a/b/g/n/ac IEEE 802.11a/b/g/n/ac
Bluetooth Bluetooth 5.0 LE Bluetooth 5.1
NFC Yes Yes Both phones have an NFC reader for mobile payments.
Messaging Services SMS, MMS -
MEDIA Samsung Galaxy A21s OPPO Reno4 5G
Supported Digital Audio Standards WAV, WMA, AAC, AMR, MP3, FLAC, XMF, OGG, MIDI, M4A, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, MID WAV, WMA, AAC, AMR, MP3, FLAC, OGG, APE (Monkey's Audio), apt-X, LDAC, MID, SBC, apt-X HD, APTX-TWS+
Supported Digital Video Standards MKV, FLV, AVI, WMV, ASF, 3GP, M4V, WebM, 3G2, MP4 MKV, FLV, AVI, MOV, WMV, 3GP, MP4
Sound Enhancements Dolby Atmos sound technology Dolby Atmos sound technology
FEATURES Samsung Galaxy A21s OPPO Reno4 5G
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, proximity sensor, gyro sensor, geomagnetic sensor Accelerometer, ambient light sensor, proximity sensor, pedometer, gyro sensor, geomagnetic sensor, gravity sensor
Security Devices Face recognition, fingerprint reader Fingerprint reader (under display)
Additional Phone Features Samsung KNOX, Virtual Light Sensing MU-MIMO technology, Google Lens
OTHERS Samsung Galaxy A21s OPPO Reno4 5G
Included Accessories Power adapter Headphones, power adapter, SIM card removal tool, USB-C cable, protective case
Compliant Standards - IP54, TUV Rheinland Certified Safe Fast-Charge System
Other projects: