In depth comparison and review of HTC One (A9) 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 One (A9) | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Touch | |
| Height | 145.75 mm | 165.2 mm | Realme C21 has greater height than HTC One (A9). |
| Width | 70.8 mm | 76.4 mm | Realme C21 has greater width than HTC One (A9). |
| Depth | 7.26 mm | 8.9 mm | HTC One (A9) is narrower than HTC One (A9). |
| Weight | 143 g | 190 g | HTC One (A9) is lighter than HTC One (A9). |
| Body Colour | Topaz gold | Opal silver | Carbon grey | Cross black | Cross blue | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 0.41 W/kg | - | |
| 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 One (A9) | Realme C21 |
|---|
| Display Type | OLED display | LCD display | |
|---|---|---|---|
| Display Technology | AMOLED | LCD | |
| Screen Size (Display Size) | 5" | 6.5" | Realme C21 has larger screen size than HTC One (A9). |
| Screen Resolution (Display Resolution) | 1920 x 1080 pixels | 1600 x 720 pixels | HTC One (A9) has better screen resolution than Realme C21. |
| Display Format | Full HD | HD+ | |
| Pixel Density | 440 ppi | - | |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | - | 420 cd/m² | |
| Display Features | - | Mini-drop display | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 4 (scratch resistant glass) | - |
| PROCESSOR | HTC One (A9) | Realme C21 |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 617 | MediaTek Helio G35 | |
|---|---|---|---|
| Clock Speed | 1.5 GHz | 2.3 GHz | Realme C21 has higher clock speed than HTC One (A9). |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| 64-bit Architecture | Yes | - | HTC One (A9) has 64-bit architecture. |
| Graphics System (GPU) | - | PowerVR GE8320 |
| MEMORY | HTC One (A9) | Realme C21 |
|---|
| RAM | 2 GB | LPDDR4X SDRAM - 3 GB | Realme C21 has more RAM than HTC One (A9). |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 16 GB | 32 GB | Realme C21 has more internal memory than HTC One (A9). |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 2 TB | microSD |
| CAMERA | HTC One (A9) | 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/2.0 | F/2.2 | HTC One (A9) has better lens aperture than HTC One (A9). |
| Lens Construction | - | 5-element | |
| Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | - | HTC One (A9) has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | - | 4x | |
| Special Effects | - | HDR | |
| Camera Modes | Pro mode | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | |
| Light Source | LED light | LED flash | |
| Video Resolutions | 1920 x 1080 (1080p) | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Functions) | Sapphire crystal lens cover | 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) | 4 Megapixel | 5 Megapixel | Realme C21 has better front camera resolution than HTC One (A9). |
| Lens Aperture (Front) | F/2.0 | F/2.2 | HTC One (A9) has better front lens aperture than HTC One (A9). |
| Lens Element Qty (Front) | - | 3-element | |
| Focus Adjustment | Focus free | - | |
| Special Effects (Front) | - | 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) | - | |
| Camera Features (Front) | HTC UltraPixel Camera | - |
| BATTERY AND CHARGING | HTC One (A9) | Realme C21 |
|---|
| Battery Capacity (Battery Size) | 2150 mAh | 5000 mAh | Realme C21 has larger battery capacity than HTC One (A9). |
|---|---|---|---|
| Standby Time | 432 hours | - | |
| Talk Time | 960 minutes | - | |
| Run Time Details | Talk (WCDMA): up to 960 min Standby (WCDMA): up to 432 hrs Active online usage (Wi-Fi): up to 9 hrs Playback (audio): up to 60 hrs Playback (video): up to 12 hrs |
- | |
| Battery Technology | Lithium polymer | - |
| CELLULAR | HTC One (A9) | 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 6.0 (Marshmallow) | Android 10 | |
| User Interface | HTC Sense | Realme UI | |
| Navigation | GPS, GLONASS | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | HTC One (A9) | 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 1, Band 3, 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 1800+, 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 4.1 | Bluetooth 5.0 | |
| NFC | Yes | - | HTC One (A9) has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | HTC One (A9) | Realme C21 |
|---|
| Supported Digital Audio Standards | WAV, WMA, AAC, AMR, MP3, FLAC, AC-3, OGG, MIDI, M4A, EC3 | - | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, AVI, MPEG-4, WMV, 3GP, 3G2 | - | |
| Sound Enhancements | Dolby sound technology | - |
| FEATURES | HTC One (A9) | 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 | Ambient light sensor, proximity sensor, digital compass, magnetometer, gyro sensor, G-sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Fingerprint reader | Fingerprint reader | |
| Additional Phone Features | DLNA Certified, HTC BlinkFeed, Hi-Res Audio, Android Sensor Hub | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | HTC One (A9) | Realme C21 |
|---|
| Included Accessories | Power adapter | USB cable, power adapter, SIM card removal tool | |
|---|---|---|---|
| Compliant Standards | - | TUV Rheinland |
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