In depth comparison and review of Microsoft Surface Duo and Realme 9i. 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 | Microsoft Surface Duo | Realme 9i |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Form Factor | Folder - dual screen | Touch | |
| Height | 145.2 mm | 164.4 mm | Realme 9i has greater height than Microsoft Surface Duo. |
| Width | 93.3 mm | 75.7 mm | Microsoft Surface Duo has greater width than Realme 9i. |
| Depth | 9.9 mm | 8.4 mm | Realme 9i is narrower than Microsoft Surface Duo. |
| Weight | 250 g | 190 g | Realme 9i is lighter than Microsoft Surface Duo. |
| Dimensions Details | Unfolded - 186.9 mm x 4.8 mm x 145.2 mm | - | |
| Body Colour | Glacier | Prism black | Prism blue | |
| Waterproof (Water-resistant) | - | - | |
| SAR Value | 0.726 W/kg (head), 1.478 W/kg (body) | 1.02 W/kg (body), 2.072 W/kg (limb), 0.788 W/kg (head) | |
| Connector Type | USB Type-C - 24 pin USB-C | USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Nano SIM, Electronic SIM card (e-SIM) | Nano SIM | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Microsoft Surface Duo | Realme 9i |
|---|
| Display Type | OLED display | - | |
|---|---|---|---|
| Display Technology | AMOLED | - | |
| Foldable Display | Yes | - | |
| Display Design | Both directions folding | - | |
| Screen Size (Display Size) | 5.6" | 6.6" | Realme 9i has larger screen size than Microsoft Surface Duo. |
| Screen Resolution (Display Resolution) | 1800 x 1350 pixels | 2412 x 1080 pixels | Realme 9i has better screen resolution than Microsoft Surface Duo. |
| Display Format | - | Full HD+ | |
| Pixel Density | 401 ppi | 401 ppi | Both phones have the same pixel density. |
| Aspect Ratio | 4:3 | - | |
| Max Brightness | - | 480 cd/m² | |
| Display Enhancement Technology | - | Ultra-Smooth | |
| Display Refresh Rate | - | 90 Hz | |
| Touch Sampling Rate | - | 180 Hz | |
| Display Features | PixelSense Fusion Displays | 5-level fresh rates | |
| Display Protection (Screen Protector) | Corning Gorilla Glass (scratch resistant glass) | Dragontrail PRO (scratch resistant glass) |
| SECOND DISPLAY |
|---|
| Second Display Type | OLED display - colour | - | |
|---|---|---|---|
| Second Display Screen Size | 5.6" | - | |
| Second Display Resolution | 1800 x 1350 pixels | - |
| UNFOLDED DISPLAY |
|---|
| Unfolded Display Screen Size | 8.1 in | - | |
|---|---|---|---|
| Unfolded Display Resolution | 2700 x 1800 pixels | - |
| PROCESSOR | Microsoft Surface Duo | Realme 9i |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 855 | Qualcomm Snapdragon 680 | |
|---|---|---|---|
| Clock Speed | - | 2.4 GHz | |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | - | Qualcomm ADRENO 610 |
| MEMORY | Microsoft Surface Duo | Realme 9i |
|---|
| RAM | 6 GB | LPDDR4X SDRAM - 4 GB + up to 11 GB virtual extension | Microsoft Surface Duo has more RAM than Realme 9i. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 128 GB | Both phones have the same internal memory capacity. |
| Memory Interface | UFS 3.0 | UFS 2.1 | |
| Supported Flash Memory Cards (Expandable Memory) | - | microSDHC, microSD, microSDXC - up to 1 TB |
| CAMERA | Microsoft Surface Duo | Realme 9i |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 0 | 3 | |
|---|---|---|---|
| Sensor Resolution | - | 50 Megapixel | |
| Lens Aperture | - | F/1.8 | |
| Lens Construction | - | 5-element | |
| Focus Adjustment | - | Automatic | |
| Special Effects | - | HDR | |
| Camera Modes | - | Panorama, Slow motion mode, night mode, Expert Mode, portrait mode, Timelapse video, Ultra Macro Mode, 50MP mode, Super Text, Digital Zoom mode | |
| Light Source | - | LED flash | |
| Video Resolutions | - | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps, 1280 x 720 (720p) at 120 fps | |
| Camera Features (Functions) | - | Phase Detect Auto-Focus (PDAF), AI Triple camera |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | - | 2 Megapixel | |
|---|---|---|---|
| Lens Aperture (2nd Camera) | - | F/2.4 | |
| Camera Functions (2nd Camera) | - | Macro camera | |
| Camera Features (2nd Camera) | - | 4cm macro photography |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | - | 2 Megapixel | |
|---|---|---|---|
| Lens Aperture (3rd Camera) | - | F/2.4 | |
| Camera Functions (3rd Camera) | - | B&W lens |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 11 Megapixel | 16 Megapixel | Realme 9i has better front camera resolution than Microsoft Surface Duo. |
| Lens Aperture (Front) | F/2.0 | F/2.1 | Microsoft Surface Duo has better front lens aperture than Microsoft Surface Duo. |
| Lens Element Qty (Front) | - | 5-element | |
| Field of View (Front) | 84 degree(s) | - | |
| Pixel Size (Front) | 1 μm | - | |
| Special Effects (Front) | HDR | HDR | |
| Camera Modes (Front) | Burst mode, Panorama, low-light shots, Portrait mode with adjustable depth control | Panorama, Time-lapse mode, night mode, portrait mode, AI Beauty | |
| Light Source (Front) | High CRI LED flash | - | |
| Video Resolutions (Front) | 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 | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps | |
| Camera Features (Front) | Phase Detect Auto-Focus (PDAF), FOV optimised with AI (for front and rear), dynamic range scene detection, Super-resolution zoom, super zoom up to 7x, gyro-based digital video stabilisation | - |
| BATTERY AND CHARGING | Microsoft Surface Duo | Realme 9i |
|---|
| Battery Capacity (Battery Size) | 3577 mAh | 5000 mAh | Realme 9i has larger battery capacity than Microsoft Surface Duo. |
|---|---|---|---|
| Fast Charging Technology | - | Dart Charge | Realme 9i has fast charging technology. |
| Standby Time | 240 hours | 995 hours | Realme 9i has longer standby time than Microsoft Surface Duo. |
| Talk Time | 1620 minutes | 2904 minutes | Realme 9i has longer battery life when making calls than Microsoft Surface Duo. |
| Run Time Details | Standby: up to 240 hrs Talk: up to 1620 min Playback (local video): up to 15.5 hrs |
Standby: up to 995 hrs Talk: up to 2904 min WhatsApp: up to 20.7 hrs Playback (Music): up to 116.3 hrs |
| CELLULAR | Microsoft Surface Duo | Realme 9i |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 4G | Both phones have the same mobile network generation. |
| Operating System | Android 10 | Android 11 | |
| User Interface | - | Realme UI 2.0 | |
| Intelligent Assistant | Google Assistant | - | |
| Navigation | GPS, GLONASS, BeiDou, Galileo, QZSS | GPS, GLONASS, BeiDou, Galileo |
| COMMUNICATIONS | Microsoft Surface Duo | Realme 9i |
|---|
| Data Transmission | GPRS, FDD-LTE, TDD-LTE, LAA | 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 2, Band 5, Band 8 | Band 1, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 850, 900 | 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 14, Band 19, Band 20, Band 25, Band 26, Band 28, Band 29, Band 30, Band 38, Band 39, Band 40, Band 41, Band 46, 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 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 5150, 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 | Wi-Fi | |
| Bluetooth | Bluetooth 5.0 | Bluetooth 5.0 | |
| NFC | - | Yes | Realme 9i has NFC reader for mobile payments. |
| MEDIA | Microsoft Surface Duo | Realme 9i |
|---|
| Supported Digital Audio Standards | WAV, AAC, AMR, MP3, FLAC, OGG, MIDI, M4A, apt-X, IMY, RTTTL, RTX, OTA, MID | - | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, FLV, AVI, MOV, WMV, 3GP, TS, WebM, H.265 HEVC, MP4 | - | |
| Sound Enhancements | Qualcomm aptX audio | - |
| FEATURES | Microsoft Surface Duo | Realme 9i |
|---|
| Phone Functions | Speakerphone, voice control, call timer, conference call, flight mode, voice dialing, vibrating alert | - | |
|---|---|---|---|
| Sensors | Proximity sensor, hall sensor, dual accelerometers, dual gyroscope, dual magnetometer, dual ambient light sensor | Accelerometer, proximity sensor, magnetometer, light sensor | |
| Security Devices | Fingerprint reader (side) | Fingerprint reader (side) | |
| Additional Phone Features | MIMO technology, Fast Charging, dual microphones with noise suppression and echo cancellation, Full Duplex communication, 360° hinge, stylus support, two apps side-by-side | Dual microphones, Fast Charging, Super power saving mode, dual stereo speakers |
| OTHERS | Microsoft Surface Duo | Realme 9i |
|---|
| Included Accessories | SIM card removal tool, USB-C headphones, 18W charger, Surface Duo Bumper (Glacier) | Screen protection film, SIM card removal tool, USB-C cable, protective case, 33W charger |
|---|
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