In depth comparison and review of Xiaomi Redmi Note 9 and Realme C21. 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.
| DESIGN AND DIMENSIONS | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 162.3 mm | 165.2 mm | Realme C21 has greater height than Xiaomi Redmi Note 9. |
| Width | 77.2 mm | 76.4 mm | Xiaomi Redmi Note 9 has greater width than Realme C21. |
| Depth | 8.9 mm | 8.9 mm | Both phones are the same depth. |
| Weight | 199 g | 190 g | Realme C21 is lighter than Xiaomi Redmi Note 9. |
| Body Colour | Forest green | Cross black | Cross blue | |
| Protection | Splashproof | - | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 2.262 W/kg (limb), 1.138 W/kg (body), 0.795 W/kg (head) | - | |
| Integrated Components | Ultra-linear speaker | - | |
| Connector Type | USB Type-C - 24 pin USB-C Headset jack - mini-phone 3.5mm |
Micro-USB 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 | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| Display Type | - | LCD display | |
|---|---|---|---|
| Display Technology | - | LCD | |
| Screen Size (Display Size) | 6.53" | 6.5" | Xiaomi Redmi Note 9 has larger screen size than Realme C21. |
| Screen Resolution (Display Resolution) | 2340 x 1080 pixels | 1600 x 720 pixels | Xiaomi Redmi Note 9 has better screen resolution than Realme C21. |
| Display Format | Full HD+ | HD+ | |
| Aspect Ratio | 19.5:9 | 20:9 | |
| Max Brightness | 450 cd/m² | 420 cd/m² | Xiaomi Redmi Note 9 has better display brightness than Realme C21. |
| Contrast Ratio | 1500:1 | - | |
| Display Features | Reading mode 2.0, Dot Display, Full Screen gestures | Mini-drop display | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 5 (scratch resistant glass) | - |
| PROCESSOR | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| Processor Type (CPU) | MediaTek Helio G85 | MediaTek Helio G35 | |
|---|---|---|---|
| Clock Speed | 2 GHz | 2.3 GHz | Realme C21 has higher clock speed than Xiaomi Redmi Note 9. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | ARM G52 MC2 | PowerVR GE8320 |
| MEMORY | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| RAM | 3 GB | LPDDR4X SDRAM - 3 GB | Both phones have the same RAM size. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 64 GB | 32 GB | Xiaomi Redmi Note 9 has more internal memory than Realme C21. |
| Supported Flash Memory Cards (Expandable Memory) | microSD | microSD |
| CAMERA | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 3 | |
|---|---|---|---|
| Sensor Resolution | 48 Megapixel | 13 Megapixel | Xiaomi Redmi Note 9 has better camera resolution than Realme C21. |
| Sensor Size | 1/2" | - | |
| Lens Aperture | F/1.79 | F/2.2 | Xiaomi Redmi Note 9 has better lens aperture than Xiaomi Redmi Note 9. |
| Lens Construction | 6-element | 5-element | |
| Field of View (FoV) | 79.4 degree(s) | - | |
| Pixel Size | 0.8 μm | - | |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | - | 4x | |
| Special Effects | HDR, Kaleidoscope | HDR | |
| Camera Modes | Burst mode, Panorama, night mode, Smart ultra-wide angle mode, Photo timer, Custom watermark, Documents, Beautify, Levelling, Cinematic portraits | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | |
| Face Recognition (Face ID) | Face recognition | - | Xiaomi Redmi Note 9 has face detection. |
| Light Source | Flash | LED flash | |
| Video Resolutions | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps, Slo-mo video 1280 x 720 (720p) at 120 fps | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Functions) | 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 | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 8 Megapixel | 2 Megapixel | Xiaomi Redmi Note 9 has better second camera resolution than Realme C21. |
|---|---|---|---|
| Sensor Size (2nd Camera) | 1/4" | - | |
| Lens Type (2nd Camera) | Ultra wide-angle lens | - | |
| Lens Aperture (2nd Camera) | F/2.2 | F/2.4 | Xiaomi Redmi Note 9 has better second camera lens aperture than Xiaomi Redmi Note 9. |
| Lens Element Qty (2nd Camera) | 5-element | 3-element | |
| Field of View (2nd Camera) | 118 degree(s) | - | |
| Pixel Size (2nd Camera) | 1.2 μm | - | |
| Camera Functions (2nd Camera) | - | B&W lens | |
| Camera Features (2nd Camera) | 5-piece lens | - |
| 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 | |
| Pixel Size (3rd Camera) | 1.75 μm | - | |
| Camera Functions (3rd Camera) | Macro camera | Macro camera | |
| Camera Features (3rd Camera) | AF (2cm-10cm) | 4cm macro photography |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 2 Megapixel | - | |
|---|---|---|---|
| Sensor Size (4th Camera) | 1/5" | - | |
| Lens Aperture (4th Camera) | F/2.4 | - | |
| Lens Element Qty (4th Camera) | 3-element | - | |
| Pixel Size (4th Camera) | 1.75 μm | - | |
| Camera Functions (4th Camera) | Depth camera | - |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 13 Megapixel | 5 Megapixel | Xiaomi Redmi Note 9 has better front camera resolution than Realme C21. |
| Sensor Size (Front) | 1/3.06" | - | |
| Lens Aperture (Front) | F/2.25 | F/2.2 | Realme C21 has better front lens aperture than Xiaomi Redmi Note 9. |
| Lens Element Qty (Front) | 5-element | 3-element | |
| Field of View (Front) | 74 degree(s) | - | |
| Pixel Size (Front) | 1.12 μm | - | |
| Special Effects (Front) | HDR | HDR | |
| Camera Modes (Front) | Panoramic selfies, AI portrait mode, AI Beautify | Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode | |
| Face Recognition (Face ID) | Face recognition | Face recognition | Both phones have face detection. |
| Light Source (Front) | Display flash | - | |
| Camera Features (Front) | Palm shutter, AI silhouette detection | - |
| BATTERY AND CHARGING | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| Battery Capacity (Battery Size) | 5020 mAh | 5000 mAh | Xiaomi Redmi Note 9 has larger battery capacity than Realme C21. |
|---|---|---|---|
| Talk Time | 1980 minutes | - | |
| Run Time Details | Talk: up to 1980 min Gaming: up to 16 hrs Playback (Music): up to 147 hrs Navigation: up to 16 hrs |
- | |
| Battery Technology | Lithium polymer | - |
| CELLULAR | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| 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 | - | Realme UI | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou, Galileo | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| Data Transmission | VoLTE, FDD-LTE, TDD-LTE | FDD-LTE, TDD-LTE | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1900 GSM, 2100 GSM | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 8 | Band 1, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40, Band 41 | Band 1, Band 3, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40, Band 41 | |
| 4G LTE Frequency | 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, TDD 2500 | FDD 2100, FDD 1800+, FDD 850, FDD 2600, FDD 900, FDD 800 DD, FDD 700 APT, TDD 2600, TDD 2300, TDD 2500 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac | IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.0 |
| MEDIA | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| Supported Digital Audio Standards | WAV, AAC, AMR, MP3, FLAC, APE (Monkey's Audio) | - | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, XviD, M4V, MP4 | - | |
| Audio Amplifier | Smart PA | - |
| FEATURES | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| 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, digital compass, gyro sensor, infrared (IR) sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Face recognition, fingerprint reader | Fingerprint reader | |
| Additional Phone Features | Infrared remote control, HyperEngine technology | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | Xiaomi Redmi Note 9 | Realme C21 |
|---|
| Included Accessories | Protective cover, power adapter, SIM card removal tool, USB-C cable | USB cable, power adapter, SIM card removal tool | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland Low Blue Light Certification | TUV Rheinland |
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