Realme C21 vs. Xiaomi POCO F3

Phone Comparison, Reviews and Tests

In depth comparison and review of Realme C21 and Xiaomi POCO F3. 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

Realme C21 vs. Xiaomi POCO F3 Comparison Chart
DESIGN AND DIMENSIONS Realme C21 Xiaomi POCO F3
Product Type Smartphone Smartphone
Form Factor Touch Touch
Height 165.2 mm 163.7 mm Realme C21 has greater height than Xiaomi POCO F3.
Width 76.4 mm 76.4 mm Both phones are the same width
Depth 8.9 mm 7.8 mm Xiaomi POCO F3 is narrower than Realme C21.
Weight 190 g 196 g Realme C21 is lighter than Realme C21.
Body Colour Cross black | Cross blue Night black
Body Material - Corning Gorilla Glass 5
Waterproof (Water-resistant) - -
SAR Value - 0.599 W/kg (head), 0.843 W/kg (body), 1.95 W/kg (limb)
Connector Type Micro-USB
Headset jack - mini-phone 3.5mm
USB Type-C - 24 pin USB-C
SIM Card Type (Size) Nano SIM -
SIM Card Qty Dual-SIM Dual-SIM
DISPLAY Realme C21 Xiaomi POCO F3
Display Type LCD display OLED display
Display Technology LCD AMOLED
Screen Size (Display Size) 6.5" 6.67" Xiaomi POCO F3 has larger screen size than Realme C21.
Screen Resolution (Display Resolution) 1600 x 720 pixels 2400 x 1080 pixels Xiaomi POCO F3 has better screen resolution than Realme C21.
Display Format HD+ Full HD+
Aspect Ratio 20:9 20:9
Max Brightness 420 cd/m² 1300 cd/m² Xiaomi POCO F3 has better display brightness than Realme C21.
Contrast Ratio - 5000000:1
HDR - Yes Xiaomi POCO F3 has HDR.
HDR Technology - HDR10+
Display Refresh Rate - 120 Hz
Touch Sampling Rate - 360 Hz
Display Features Mini-drop display DCI-P3 Wide colour gamut, MEMC technology, Sunlight display 3.0
Display Protection (Screen Protector) - Corning Gorilla Glass 5 (scratch resistant glass)
PROCESSOR Realme C21 Xiaomi POCO F3
Processor Type (CPU) MediaTek Helio G35 Qualcomm Snapdragon 870
Clock Speed 2.3 GHz 3.2 GHz Xiaomi POCO F3 has higher clock speed than Realme C21.
Processor Core Qty 8-core 8-core Both phones have the same number of phone cores.
Graphics System (GPU) PowerVR GE8320 Qualcomm ADRENO 650
MEMORY Realme C21 Xiaomi POCO F3
RAM LPDDR4X SDRAM - 3 GB LPDDR5 SDRAM - 8 GB Xiaomi POCO F3 has more RAM than Realme C21.
Internal Memory Size (Storage Capacity) 32 GB 256 GB Xiaomi POCO F3 has more internal memory than Realme C21.
Memory Interface - UFS 3.1
Supported Flash Memory Cards (Expandable Memory) microSD -
CAMERA Realme C21 Xiaomi POCO F3
MAIN CAMERA
Number of Main Cameras 3 3
Sensor Resolution 13 Megapixel 48 Megapixel Xiaomi POCO F3 has better camera resolution than Realme C21.
Lens Aperture F/2.2 F/1.79 Xiaomi POCO F3 has better lens aperture than Realme C21.
Lens Construction 5-element -
Pixel Size - 1.6 μm
Focus Adjustment Automatic Automatic
Digital Zoom 4x -
Special Effects HDR -
Camera Modes Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape Slow Shutter, Night Mode 2.0, One-Click AI Cinema, Magic Zoom, Time Freeze, Night Time-lapse, Parallel World, Freeze Frame Video
Light Source LED flash LED flash
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, Slo-mo video 1280 x 720 (720p) at 120 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, Slo-mo video 1920 x 1080 (1080p) at 960 fps, Slo-mo video 1280 x 720 (720p) at 960 fps
Camera Features (Functions) Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost AI Triple camera, 4-in-1 to 1.6μm Super Pixel
SECOND CAMERA
Sensor Resolution (2nd Camera) 2 Megapixel 8 Megapixel Xiaomi POCO F3 has better second camera resolution than Realme C21.
Lens Type (2nd Camera) - Ultra wide-angle lens
Lens Aperture (2nd Camera) F/2.4 F/2.2 Xiaomi POCO F3 has better second camera lens aperture than Realme C21.
Lens Element Qty (2nd Camera) 3-element -
Field of View (2nd Camera) - 119 degree(s)
Camera Functions (2nd Camera) B&W lens -
THIRD CAMERA
Sensor Resolution (3rd Camera) 2 Megapixel 5 Megapixel Xiaomi POCO F3 has higher resolution third camera than Realme C21.
Lens Type (3rd Camera) - Tele-macro lens
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 AF (3cm-7cm)
FRONT CAMERA
Number of Front Cameras 1 1
Sensor Resolution (Front) 5 Megapixel 20 Megapixel Xiaomi POCO F3 has better front camera resolution than Realme C21.
Lens Aperture (Front) F/2.2 F/2.45 Realme C21 has better front lens aperture than Realme C21.
Lens Element Qty (Front) 3-element -
Special Effects (Front) HDR -
Camera Modes (Front) Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode Night mode, Movie frame
Face Recognition (Face ID) Face recognition - Realme C21 has face detection.
BATTERY AND CHARGING Realme C21 Xiaomi POCO F3
Battery Capacity (Battery Size) 5000 mAh 4520 mAh Realme C21 has larger battery capacity than Xiaomi POCO F3.
Recharge Time (Charging Time) - 52 min
Standby Time - 268 hours
Run Time Details - Standby: up to 268 hrs
Gaming: up to 10 hrs
Playback (video): up to 14 hrs
Playback (Music): up to 149 hrs
CELLULAR Realme C21 Xiaomi POCO F3
Technology WCDMA (UMTS) / GSM WCDMA (UMTS) / GSM
Mobile Broadband Generation 4G 5G Xiaomi POCO F3 has more advanced generation mobile network.
Operating System Android 10 -
User Interface Realme UI MIUI 12
Payment Technology - Google Pay
Navigation GPS, A-GPS, GLONASS, BeiDou GPS, GLONASS, BeiDou, Galileo, NavIC
COMMUNICATIONS Realme C21 Xiaomi POCO F3
Data Transmission 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 5, Band 8 Band 1, Band 2, Band 4, Band 5, Band 8
3G UMTS Frequency 2100, 850, 900 2100, 1900, 1700, 850, 900
4G LTE Band Band 1, 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 20, Band 28, Band 38, Band 40, Band 41, Band 66
4G LTE Frequency FDD 2100, 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 DD, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3
5G NR Band - N1, n3, n5, n7, n8, n20, n28, n38, n41, n77, n78
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
Wireless Interface IEEE 802.11b/g/n IEEE 802.11a/b/g/n/ac/ax, Infrared (IR)
Bluetooth Bluetooth 5.0 Bluetooth 5.1
NFC - Yes Xiaomi POCO F3 has NFC reader for mobile payments.
Modem - Snapdragon X55 5G
MEDIA Realme C21 Xiaomi POCO F3
Sound Enhancements - Dolby Atmos sound technology, Hi-Res audio certified
Video Enhancements - HDR10
FEATURES Realme C21 Xiaomi POCO F3
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, magnetometer, light sensor Accelerometer, proximity sensor, digital compass, gyroscope, 360° ambient light sensor
Security Devices Fingerprint reader Face recognition, fingerprint reader (side)
Security Technology - AI face unlock
Additional Phone Features Super power saving mode, HyperEngine technology, Reverse charging Infrared remote control, Three microphones, LiquidCool Technology 1.0 Plus, dual stereo speakers, X-axis linear vibration motor
OTHERS Realme C21 Xiaomi POCO F3
Included Accessories USB cable, power adapter, SIM card removal tool Power adapter, SIM card removal tool, USB-C to 3.5 jack adapter, USB-C cable, protective case
Compliant Standards TUV Rheinland SGS Eye Care Display Certification, SGS Seamless Pro 120Hz Certification
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