In depth comparison and review of HTC Desire 820 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 | HTC Desire 820 | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 157.7 mm | 165.2 mm | Realme C21 has greater height than HTC Desire 820. |
| Width | 78.74 mm | 76.4 mm | HTC Desire 820 has greater width than Realme C21. |
| Depth | 7.74 mm | 8.9 mm | HTC Desire 820 is narrower than HTC Desire 820. |
| Weight | 155 g | 190 g | HTC Desire 820 is lighter than HTC Desire 820. |
| Body Colour | Tuxedo grey | Marble white | Cross black | Cross blue | |
| Body Material | Polycarbonate | - | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 0.323 W/kg (body), 0.373 W/kg (head) | - | |
| Integrated Components | FM radio | - | |
| Connector Type | Headset jack - mini-phone 3.5mm Micro-USB - 5 pin Micro-USB Type B |
Micro-USB Headset jack - mini-phone 3.5mm |
|
| SIM Card Type (Size) | Nano SIM | Nano SIM | |
| SIM Card Qty | - | Dual-SIM |
| DISPLAY | HTC Desire 820 | Realme C21 |
|---|
| Display Type | LCD display | LCD display | |
|---|---|---|---|
| Display Technology | Super LCD 2 | LCD | |
| Screen Size (Display Size) | 5.5" | 6.5" | Realme C21 has larger screen size than HTC Desire 820. |
| Screen Resolution (Display Resolution) | 1280 x 720 pixels | 1600 x 720 pixels | Realme C21 has better screen resolution than HTC Desire 820. |
| Display Format | HD | HD+ | |
| Pixel Density | 267 ppi | - | |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | - | 420 cd/m² | |
| Colour Depth | 16.7 million colours | - | |
| Display Features | - | Mini-drop display | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 3 (scratch resistant glass) | - |
| PROCESSOR | HTC Desire 820 | Realme C21 |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 615 | MediaTek Helio G35 | |
|---|---|---|---|
| Clock Speed | - | 2.3 GHz | |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | Qualcomm ADRENO 405 | PowerVR GE8320 |
| MEMORY | HTC Desire 820 | Realme C21 |
|---|
| RAM | 2 GB | LPDDR4X SDRAM - 3 GB | Realme C21 has more RAM than HTC Desire 820. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 16 GB | 32 GB | Realme C21 has more internal memory than HTC Desire 820. |
| User Memory | 11.2 GB | - | |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 128 GB | microSD |
| CAMERA | HTC Desire 820 | Realme C21 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 1 | 3 | |
|---|---|---|---|
| Sensor Resolution | 13 Megapixel | 13 Megapixel | Both phones have the same camera resolution. |
| Sensor Type | BSI-CMOS | - | |
| Lens Aperture | F/2.2 | F/2.2 | Both phones have the same camera lens aperture. |
| Lens Construction | - | 5-element | |
| Focus Adjustment | Automatic | Automatic | |
| Minimum Focal Length (Focal Distance) | 28 mm | - | |
| Digital Zoom | - | 4x | |
| Special Effects | - | HDR | |
| HDR Mode | Auto HDR mode | - | |
| Camera Modes | Burst mode | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | |
| Face Recognition (Face ID) | Face detection | - | HTC Desire 820 has face detection. |
| Light Source | LED light | LED flash | |
| Still Image Resolutions | 4160 x 3120 | - | |
| Video Resolutions | 1920 x 1080 (1080p) | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Functions) | Auto selfie, Photo Booth feature, Live Makeup, Split Capture | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | - | 2 Megapixel | |
|---|---|---|---|
| Lens Aperture (2nd Camera) | - | F/2.4 | |
| Lens Element Qty (2nd Camera) | - | 3-element | |
| Camera Functions (2nd Camera) | - | B&W lens |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | - | 2 Megapixel | |
|---|---|---|---|
| Lens Aperture (3rd Camera) | - | F/2.4 | |
| Lens Element Qty (3rd Camera) | - | 3-element | |
| Camera Functions (3rd Camera) | - | Macro camera | |
| Camera Features (3rd Camera) | - | 4cm macro photography |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 8 Megapixel | 5 Megapixel | HTC Desire 820 has better front camera resolution than Realme C21. |
| Sensor Type (Front) | BSI-CMOS | - | |
| Lens Aperture (Front) | - | F/2.2 | |
| Lens Element Qty (Front) | - | 3-element | |
| Special Effects (Front) | Face fusion | HDR | |
| Camera Modes (Front) | - | Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode | |
| Face Recognition (Face ID) | - | Face recognition | Realme C21 has face detection. |
| Video Resolutions (Front) | 1920 x 1080 (1080p) | - |
| BATTERY AND CHARGING | HTC Desire 820 | Realme C21 |
|---|
| Battery Capacity (Battery Size) | 2600 mAh | 5000 mAh | Realme C21 has larger battery capacity than HTC Desire 820. |
|---|---|---|---|
| Standby Time | 455 hours | - | |
| Talk Time | 1068 minutes | - | |
| Run Time Details | Talk (WCDMA): up to 1068 min Standby (WCDMA): up to 455 hrs |
- | |
| Battery Technology | Lithium polymer | - |
| CELLULAR | HTC Desire 820 | 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 4.4 (KitKat) | Android 10 | |
| User Interface | HTC Sense | Realme UI | |
| Navigation | A-GPS, GLONASS | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | HTC Desire 820 | Realme C21 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, LTE | FDD-LTE, TDD-LTE | |
|---|---|---|---|
| 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 | |
| 3G UMTS Frequency | - | 2100, 850, 900 | |
| 4G LTE Band | Band 3, Band 7, Band 8, Band 20 | Band 1, Band 3, Band 5, Band 7, Band 8, Band 20, Band 28, Band 38, Band 40, Band 41 | |
| 4G LTE Frequency | FDD 1800+, FDD 2600, FDD 900, FDD 800 DD | 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 | IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 4.0 | Bluetooth 5.0 | |
| Bluetooth Profiles | A2DP | - | |
| NFC | Yes | - | HTC Desire 820 has NFC reader for mobile payments. |
| Communication Features | Mobile Email client, Internet browser | - | |
| Messaging Services | SMS, MMS | - |
| MEDIA | HTC Desire 820 | Realme C21 |
|---|
| Supported Digital Audio Standards | WAV, AAC, AMR, MP3, OGG, MIDI, M4A, WMA 9 | - | |
|---|---|---|---|
| Supported Digital Video Standards | AVI, MPEG-4, 3GP, H.264, H.263, WMV9, 3G2 | - | |
| Sound Enhancements | HTC BoomSound | - |
| FEATURES | HTC Desire 820 | Realme C21 |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, voice dialing, vibrating alert | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | |
|---|---|---|---|
| Sensors | Accelerometer, ambient light sensor, proximity sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | - | Fingerprint reader | |
| Personal Information Management | Calendar, synchronization with PC, calculator, reminder, alarm clock | - | |
| Additional Phone Features | DLNA Certified, sharing media via DLNA, Wi-Fi Miracast, HTC BlinkFeed, HTC Sense Voice | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | HTC Desire 820 | Realme C21 |
|---|
| Included Accessories | Power adapter | USB cable, power adapter, SIM card removal tool | |
|---|---|---|---|
| Compliant Standards | - | TUV Rheinland |
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