In depth comparison and review of Realme C21 and Microsoft Surface Duo 2. 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 | Realme C21 | Microsoft Surface Duo 2 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Touch | Folder - dual screen | |
| Height | 165.2 mm | 145.2 mm | Realme C21 has greater height than Microsoft Surface Duo 2. |
| Width | 76.4 mm | 92.1 mm | Microsoft Surface Duo 2 has greater width than Realme C21. |
| Depth | 8.9 mm | 11 mm | Realme C21 is narrower than Realme C21. |
| Weight | 190 g | 284 g | Realme C21 is lighter than Realme C21. |
| Dimensions Details | - | Unfolded - 184.5 mm x 5.5 mm x 145.2 mm | |
| Body Colour | Cross black | Cross blue | Glacier | Obsidian | |
| Body Material | - | Corning Gorilla Glass | |
| Waterproof (Water-resistant) | - | - | |
| Repairability Index | - | 3.9 (out of 10) | |
| SAR Value | - | 0.726 W/kg (head), 1.478 W/kg (body) | |
| Connector Type | Micro-USB Headset jack - mini-phone 3.5mm |
USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Nano SIM | Nano SIM, Electronic SIM card (e-SIM) | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Realme C21 | Microsoft Surface Duo 2 |
|---|
| Display Type | LCD display | OLED display | |
|---|---|---|---|
| Display Technology | LCD | AMOLED | |
| Foldable Display | - | Yes | |
| Display Design | - | Both directions folding | |
| Screen Size (Display Size) | 6.5" | 5.8" | Realme C21 has larger screen size than Microsoft Surface Duo 2. |
| Screen Resolution (Display Resolution) | 1600 x 720 pixels | 1344 x 1892 pixels | Microsoft Surface Duo 2 has better screen resolution than Realme C21. |
| Display Format | HD+ | - | |
| Pixel Density | - | 401 ppi | |
| Aspect Ratio | 20:9 | 13:9 | |
| Max Brightness | 420 cd/m² | 800 cd/m² | Microsoft Surface Duo 2 has better display brightness than Realme C21. |
| HDR | - | Yes | Microsoft Surface Duo 2 has HDR. |
| Display Refresh Rate | - | 90 Hz | |
| Display Features | Mini-drop display | DCI-P3 Wide colour gamut, 100% sRGB, Dual PixelSense Fusion Displays | |
| Display Protection (Screen Protector) | - | Corning Gorilla Glass Victus (scratch resistant glass) |
| SECOND DISPLAY |
|---|
| Second Display Type | - | OLED display - colour | |
|---|---|---|---|
| Second Display Screen Size | - | 5.8" | |
| Second Display Resolution | - | 1344 x 1892 pixels |
| UNFOLDED DISPLAY |
|---|
| Unfolded Display Screen Size | - | 8.3 in | |
|---|---|---|---|
| Unfolded Display Resolution | - | 2688 x 1892 pixels |
| PROCESSOR | Realme C21 | Microsoft Surface Duo 2 |
|---|
| Processor Type (CPU) | MediaTek Helio G35 | Qualcomm Snapdragon 888 5G | |
|---|---|---|---|
| Clock Speed | 2.3 GHz | - | |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | PowerVR GE8320 | - |
| MEMORY | Realme C21 | Microsoft Surface Duo 2 |
|---|
| RAM | LPDDR4X SDRAM - 3 GB | LPDDR5 SDRAM - 8 GB | Microsoft Surface Duo 2 has more RAM than Realme C21. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 32 GB | 128 GB | Microsoft Surface Duo 2 has more internal memory than Realme C21. |
| Supported Flash Memory Cards (Expandable Memory) | microSD | - |
| CAMERA | Realme C21 | Microsoft Surface Duo 2 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 3 | 3 | |
|---|---|---|---|
| Sensor Resolution | 13 Megapixel | 12 Megapixel | Realme C21 has better camera resolution than Microsoft Surface Duo 2. |
| Lens Aperture | F/2.2 | F/1.7 | Microsoft Surface Duo 2 has better lens aperture than Realme C21. |
| Lens Construction | 5-element | - | |
| Pixel Size | - | 1.4 μm | |
| Optical Image Stabiliser (OIS) | - | Optical Image Stabiliser (OIS) | Microsoft Surface Duo 2 has optical stabilisation. |
| Focus Adjustment | Automatic | - | |
| Digital Zoom | 4x | 10x | Microsoft Surface Duo 2 has better digital zoom than Realme C21. |
| Special Effects | HDR | HDR | |
| Camera Modes | Panorama, Time-lapse mode, Slow motion mode, Beauty mode, Expert Mode, Nightscape capture mode, Portrait, Filter mode, Super nightscape | Night mode, Auto mode, low-light shots, Panorama mode with wide dynamic range, slow motion video at 120 or 240fps | |
| Light Source | LED flash | Dual 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, 3840 x 2160 (4K) at 30 fps, 3840 x 2160 (4K) at 60 fps | |
| Camera Features (Functions) | Phase Detect Auto-Focus (PDAF), AI Triple camera, Chroma boost | Dual Pixel Phase Detect Auto-Focus (PDAF), Smooth Zoom, HEVC (High Efficiency Video coding), HDR video recording, multi-frame photo capture, dynamic range scene detection |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 2 Megapixel | 12 Megapixel | Microsoft Surface Duo 2 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 | - | |
| Pixel Size (2nd Camera) | - | 1 μm | |
| Optical Image Stabiliser (OIS) | - | Optical Image Stabiliser (OIS) | Microsoft Surface Duo 2 has optical stabilisation of the second camera. |
| Optical Zoom | - | 2x | |
| Camera Functions (2nd Camera) | B&W lens | - | |
| Camera Features (2nd Camera) | - | Phase Detect Auto-Focus (PDAF) |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 2 Megapixel | 16 Megapixel | Microsoft Surface Duo 2 has higher resolution third camera than Realme C21. |
|---|---|---|---|
| Lens Type (3rd Camera) | - | Ultra wide-angle lens | |
| Lens Aperture (3rd Camera) | F/2.4 | F/2.2 | Microsoft Surface Duo 2 has better third camera lens aperture than Realme C21. |
| Lens Element Qty (3rd Camera) | 3-element | - | |
| Field of View (3rd Camera) | - | 110 degree(s) | |
| Pixel Size (3rd Camera) | - | 1 μm | |
| Camera Functions (3rd Camera) | Macro camera | - | |
| Camera Features (3rd Camera) | 4cm macro photography | Field of view, distortion correction |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 5 Megapixel | 12 Megapixel | Microsoft Surface Duo 2 has better front camera resolution than Realme C21. |
| Lens Aperture (Front) | F/2.2 | F/2.0 | Microsoft Surface Duo 2 has better front lens aperture than Realme C21. |
| Lens Element Qty (Front) | 3-element | - | |
| Pixel Size (Front) | - | 1 μm | |
| 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. |
| BATTERY AND CHARGING | Realme C21 | Microsoft Surface Duo 2 |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 4449 mAh | Realme C21 has larger battery capacity than Microsoft Surface Duo 2. |
|---|---|---|---|
| Talk Time | - | 1680 minutes | |
| Run Time Details | - | Talk: up to 1680 min Playback (local video): up to 15.5 hrs |
| CELLULAR | Realme C21 | Microsoft Surface Duo 2 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 5G | Microsoft Surface Duo 2 has more advanced generation mobile network. |
| Operating System | Android 10 | Android 11 | |
| User Interface | Realme UI | - | |
| Intelligent Assistant | - | Google Assistant | |
| Navigation | GPS, A-GPS, GLONASS, BeiDou | GPS, GLONASS, BeiDou, Galileo, QZSS |
| COMMUNICATIONS | Realme C21 | Microsoft Surface Duo 2 |
|---|
| Data Transmission | FDD-LTE, TDD-LTE | GPRS, FDD-LTE, TDD-LTE, Gigabit LTE, LAA, 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 5, Band 8 | |
| 3G UMTS Frequency | 2100, 850, 900 | 2100, 1900, 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 13, Band 14, Band 19, Band 20, Band 25, Band 26, Band 28, Band 29, Band 30, Band 38, Band 39, Band 40, Band 41, Band 42, Band 46, Band 48, Band 66, Band 71 | |
| 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 700c, FDD 700 PS, FDD 800 upper, FDD 800 DD, FDD 1900+, FDD 850+, FDD 700 APT, FDD 700d, FDD 2300 WCS, TDD 2600, TDD 1900, TDD 2300, TDD 2500, TDD 3500, TDD 5150, TDD 3600, FDD 1700 - 2110 AWS-3, FDD 600 | |
| 5G NR Band | - | N1, n2, n3, n5, n7, n20, n28, n38, n41, n66, n71, n77, n78, n79, n25 | |
| 5G NR Frequency | - | FDD 2100, FDD 1900PCS, FDD 1800, FDD 850, FDD 2600, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, FDD AWS-3, FDD 600, TDD TD 3700, TDD TD 3500, TDD TD 4500, FDD 1900 | |
| Wireless Interface | IEEE 802.11b/g/n | IEEE 802.11ax | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.1 | |
| NFC | - | Yes | Microsoft Surface Duo 2 has NFC reader for mobile payments. |
| MEDIA | Realme C21 | Microsoft Surface Duo 2 |
|---|
| Supported Digital Audio Standards | - | WAV, AAC, AMR, MP3, FLAC, OGG, MIDI, M4A, apt-X, IMY, RTX, OTA, MID, TWS, RTTL | |
|---|---|---|---|
| Supported Digital Video Standards | - | MKV, FLV, AVI, MOV, MPEG-4, WMV, ASF, 3GP, H.264, TS, M2TS, WebM, HEVC, 3G2, HEIF, H.265 HEVC, HEIC | |
| Sound Enhancements | - | Qualcomm aptX HD audio, Qualcomm aptX Classic |
| FEATURES | Realme C21 | Microsoft Surface Duo 2 |
|---|
| 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 | Hall sensor, Time of Flight (ToF), dual accelerometers, dual gyroscope, dual magnetometer, dual ambient light sensor, dual proximity sensor | |
| Security Devices | Fingerprint reader | Fingerprint reader (side) | |
| Additional Phone Features | Super power saving mode, HyperEngine technology, Reverse charging | MIMO technology, Fast Charging, dual battery, Full Duplex communication, dual microphones with AI-based noise suppression and acoustic echo cancellation |
| OTHERS | Realme C21 | Microsoft Surface Duo 2 |
|---|
| Included Accessories | USB cable, power adapter, SIM card removal tool | SIM card removal tool, USB-C headset, Surface Duo 2 USB-C cable | |
|---|---|---|---|
| Compliant Standards | TUV Rheinland | HEARING AID M4/T3 |
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