In depth comparison and review of Apple iPhone X 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 | Apple iPhone X | Realme C21 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | A1901 | - | |
| Form Factor | Touch | Touch | |
| Height | 143.6 mm | 165.2 mm | Realme C21 has greater height than Apple iPhone X. |
| Width | 70.9 mm | 76.4 mm | Realme C21 has greater width than Apple iPhone X. |
| Depth | 7.7 mm | 8.9 mm | Apple iPhone X is narrower than Apple iPhone X. |
| Weight | 174 g | 190 g | Apple iPhone X is lighter than Apple iPhone X. |
| Body Colour | Space grey | Silver | Cross black | Cross blue | |
| Body Material | Glass, oleophobic coating, surgical‑grade stainless steel | - | |
| Protection | Dustproof, splashproof, waterproof | - | |
| Waterproof (Water-resistant) | Yes | - | Apple iPhone X is waterproof. |
| IP rating | IEC 60529 IP67 | - | |
| Repairability Index | 4.8 (out of 10) | - | |
| SAR Value | 1.17 W/kg (body), 1.08 W/kg (head) | - | |
| Connector Type | Lightning | Micro-USB Headset jack - mini-phone 3.5mm |
|
| SIM Card Type (Size) | Nano SIM | Nano SIM | |
| SIM Card Qty | Single-SIM | Dual-SIM |
| DISPLAY | Apple iPhone X | Realme C21 |
|---|
| Display Type | OLED display | LCD display | |
|---|---|---|---|
| Display Technology | Super Retina HD | LCD | |
| Screen Size (Display Size) | 5.8" | 6.5" | Realme C21 has larger screen size than Apple iPhone X. |
| Screen Resolution (Display Resolution) | 2436 x 1125 pixels | 1600 x 720 pixels | Apple iPhone X has better screen resolution than Realme C21. |
| Display Format | - | HD+ | |
| Pixel Density | 458 ppi | - | |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | 625 cd/m² | 420 cd/m² | Apple iPhone X has better display brightness than Realme C21. |
| Contrast Ratio | 1000000:1 | - | |
| HDR | Yes | - | Apple iPhone X has HDR. |
| HDR Technology | HDR10 | - | |
| Display Enhancement Technology | Dolby Vision | - | |
| Display Features | True Tone display | Mini-drop display | |
| Display Protection (Screen Protector) | Fingerprint-resistant oleophobic coating | - |
| PROCESSOR | Apple iPhone X | Realme C21 |
|---|
| Processor Type (CPU) | Apple A11 Bionic - with M11 motion | MediaTek Helio G35 | |
|---|---|---|---|
| Clock Speed | - | 2.3 GHz | |
| Processor Core Qty | - | 8-core | |
| 64-bit Architecture | Yes | - | Apple iPhone X has 64-bit architecture. |
| Graphics System (GPU) | - | PowerVR GE8320 |
| MEMORY | Apple iPhone X | Realme C21 |
|---|
| RAM | - | LPDDR4X SDRAM - 3 GB | |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 64 GB | 32 GB | Apple iPhone X has more internal memory than Realme C21. |
| Supported Flash Memory Cards (Expandable Memory) | - | microSD |
| CAMERA | Apple iPhone X | Realme C21 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 2 | 3 | |
|---|---|---|---|
| Sensor Resolution | 12 Megapixel | 13 Megapixel | Realme C21 has better camera resolution than Apple iPhone X. |
| Sensor Type | BSI | - | |
| Lens Type | Wide-angle lens | - | |
| Lens Aperture | F/1.8 | F/2.2 | Apple iPhone X has better lens aperture than Apple iPhone X. |
| Lens Construction | 6-element | 5-element | |
| Optical Image Stabiliser (OIS) | Dual OIS (Optical Image Stabilisation) | - | Apple iPhone X has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Digital Zoom | 10x | 4x | Apple iPhone X has better digital zoom than Realme C21. |
| Special Effects | - | HDR | |
| HDR Mode | Auto HDR mode | - | |
| Camera Modes | Burst mode, Panorama, Time-lapse mode, Timer mode, tap to focus, portrait mode, Portrait Lighting (beta), Live Photos, Live Photos with stabilisation | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | |
| Face Recognition (Face ID) | Body and face detection | - | Apple iPhone X has face detection. |
| Light Source | True Tone quad LED flash | LED flash | |
| Video Resolutions | 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, 3840 x 2160 (4K) at 30 fps, 3840 x 2160 (4K) at 60 fps, 3840 x 2160 (4K) at 24 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps | 1920 x 1080 (1080p) at 30 fps | |
| Camera Features (Functions) | Sapphire crystal lens cover, Cinematic video stabilisation, Focus Pixels, Cinematic video stabilisation, Playback zoom, Hybrid IR filter, Exposure control, noise reduction, geotagging, Continuous Auto Focus (CAF) | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 12 Megapixel | 2 Megapixel | Apple iPhone X has better second camera resolution than Realme C21. |
|---|---|---|---|
| Lens Type (2nd Camera) | Telephoto lens | - | |
| Lens Aperture (2nd Camera) | F/2.4 | F/2.4 | Both phones have the same second camera lens aperture. |
| Lens Element Qty (2nd Camera) | - | 3-element | |
| Camera Functions (2nd Camera) | Capture depth information | 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 | 2 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 7 Megapixel | 5 Megapixel | Apple iPhone X has better front camera resolution than Realme C21. |
| Sensor Type (Front) | BSI | - | |
| Lens Aperture (Front) | F/2.2 | F/2.2 | Both phones have the same front camera lens aperture. |
| Lens Element Qty (Front) | - | 3-element | |
| Special Effects (Front) | - | HDR | |
| HDR Mode (Front) | Auto HDR mode | - | |
| Camera Modes (Front) | Burst mode, Timer mode, portrait mode, Portrait Lighting (beta), Live Photos | Time-lapse mode, Beauty mode, portrait mode, AI Beauty, Filter mode, Panoramic mode | |
| Face Recognition (Face ID) | Body and face detection, face recognition | Face recognition | Both phones have face detection. |
| Light Source (Front) | Retina Flash | - | |
| Video Resolutions (Front) | 1920 x 1080 (1080p) | - | |
| Camera Features (Front) | FaceTime HD camera, Exposure control, Auto image stabilisation, Animoji | - |
| SECOND FRONT CAMERA |
|---|
| Camera Functions (2nd Front) | Infrared camera for Face ID | - | |
|---|---|---|---|
| Camera Features (2nd Front) | Flood Illuminator, Dot Projector | - |
| BATTERY AND CHARGING | Apple iPhone X | Realme C21 |
|---|
| Battery Capacity (Battery Size) | - | 5000 mAh | |
|---|---|---|---|
| Fast Charging Technology | Apple fast charging technology | - | Apple iPhone X has fast charging technology. |
| Wireless Charging | Yes | - | Apple iPhone X can be charged wirelessly. |
| Wireless Charging Standards | Qi | - | |
| Talk Time | 1260 minutes | - | |
| Run Time Details | Talk: up to 1260 min Active online usage: up to 12 hrs Playback (wireless video): up to 13 hrs Playback (wireless audio): up to 60 hrs |
- | |
| Battery Technology | Lithium Ion | - |
| CELLULAR | Apple iPhone X | Realme C21 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 4G | Both phones have the same mobile network generation. |
| Operating System | iOS 11 | Android 10 | |
| User Interface | - | Realme UI | |
| Intelligent Assistant | Siri | - | |
| Payment Technology | Apple Pay | - | |
| Navigation | A-GPS, GLONASS, Galileo, QZSS | GPS, A-GPS, GLONASS, BeiDou |
| COMMUNICATIONS | Apple iPhone X | Realme C21 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, LTE, DC-HSDPA, LTE Advanced, VoLTE, FDD-LTE, TDD-LTE, VoWiFi | 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 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 13, Band 17, Band 18, Band 19, Band 20, Band 25, Band 26, Band 28, Band 29, Band 30, Band 34, Band 38, Band 39, Band 40, Band 41, Band 66 | 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 700a, FDD 700c, FDD 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 1900+, FDD 850+, FDD 700 APT, FDD 700d, FDD 2300 WCS, TDD 2000, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | 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 802.11ac | IEEE 802.11b/g/n | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.0 | |
| NFC | Yes | - | Apple iPhone X has NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | Apple iPhone X | Realme C21 |
|---|
| Supported Digital Audio Standards | Audible, MP3, FLAC, Apple Lossless, AC-3, AAC-LC, LPCM, HE-AAC, Audible AAX, Audible AAX+, protected AAC, EAC3, HE-AAC v2 | - | |
|---|---|---|---|
| Supported Digital Video Standards | M-JPEG, H.264, HEVC, MPEG-4 Part 2, HEIF | - |
| FEATURES | Apple iPhone X | 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, 3-axis gyro sensor, digital compass, barometer | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Face recognition | Fingerprint reader | |
| Security Technology | Face ID | - | |
| Additional Phone Features | Multitasking, FaceTime, AirPrint wireless printing, iCloud Photo Sharing, AirDrop function, MIMO technology, Wi-Fi Calling, iBeacon microlocation, CarPlay function, QuickType keyboard, Handoff, HomeKit, Apple TV support (2nd or later), Fast Charging, AirPlay 2 wireless streaming, M11 motion coprocessor, Neural Engine | Super power saving mode, HyperEngine technology, Reverse charging |
| OTHERS | Apple iPhone X | Realme C21 |
|---|
| Included Accessories | Power adapter, Apple EarPods with Lightning Connector, Lightning to USB cable | USB cable, power adapter, SIM card removal tool | |
|---|---|---|---|
| Compliant Standards | IEC 60529 IP67, HAC (Hearing Aid Compatible) | TUV Rheinland | |
| Max Operating Temperature | 35 °C | - | |
| Min Operating Temperature | 0 °C | - | |
| Humidity Range Operating | 5 - 95% (non-condensing) | - |
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