Side by side comparison and review of Vivo X51 5G and Samsung Galaxy S21 Ultra 5G. Compare sizes, cameras, batteries, memory capacities and other key specifications and features to simplify the choice of your perfect phone. Our goal is to make it easier for you to decide on the phone that will best meet your expectations by revealing the main differences between the products.
| DESIGN AND DIMENSIONS | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | V2006 | SM-G998B/DS | |
| Form Factor | Touch | Touch | |
| Height | 158.46 mm | 161.5 mm | Samsung Galaxy S21 Ultra 5G has greater height than Vivo X51 5G. |
| Width | 72.8 mm | 75.6 mm | Samsung Galaxy S21 Ultra 5G has greater width than Vivo X51 5G. |
| Depth | 8.04 mm | 8.9 mm | Vivo X51 5G is narrower than Vivo X51 5G. |
| Weight | 181.5 g | 227 g | Vivo X51 5G is lighter than Vivo X51 5G. |
| Body Colour | Alpha grey | Phantom silver | Phantom black | Phantom navy | Phantom brown | Phantom titanium | |
| Protection | - | Dustproof, splashproof, water-resistant | |
| Waterproof (Water-resistant) | - | Yes | Samsung Galaxy S21 Ultra 5G is waterproof. |
| IP rating | IP53 | IP68 | |
| SAR Value | 1.205 W/kg (head), 1.239 W/kg (body), 3.086 W/kg (limb) | 1.58 W/kg (body), 0.714 W/kg (head), 2.56 W/kg (limb) | |
| Connector Type | USB Type-C - 24 pin USB-C | 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 | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Display Type | OLED display | OLED display | |
|---|---|---|---|
| Display Technology | AMOLED | Infinity-O Dynamic AMOLED 2X | |
| Screen Size (Display Size) | 6.56" | 6.8" | Samsung Galaxy S21 Ultra 5G has larger screen size than Vivo X51 5G. |
| Screen Resolution (Display Resolution) | 2376 x 1080 pixels | 3200 x 1440 pixels | Samsung Galaxy S21 Ultra 5G has better screen resolution than Vivo X51 5G. |
| Display Format | - | QHD+ | |
| Pixel Density | 398 ppi | 515 ppi | Samsung Galaxy S21 Ultra 5G has better pixel density than Vivo X51 5G. |
| Aspect Ratio | 19.8:9 | - | |
| Max Brightness | 500 cd/m² | - | |
| Colour Depth | 16.7 million colours | 16.7 million colours | Both phones have the same color depth. |
| HDR | - | Yes | Samsung Galaxy S21 Ultra 5G has HDR. |
| HDR Technology | - | HDR10+ | |
| Display Enhancement Technology | - | Eye Comfort Shield | |
| Display Refresh Rate | - | 120 Hz | |
| Display Features | - | Edge Screen, AOD(Always On Display) | |
| Display Protection (Screen Protector) | - | Corning Gorilla Glass Victus (scratch resistant glass) |
| PROCESSOR | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Processor Type (CPU) | Qualcomm Snapdragon 765G | Samsung Exynos 2100 | |
|---|---|---|---|
| Clock Speed | 2.4 GHz | 2.9 GHz | Samsung Galaxy S21 Ultra 5G has higher clock speed than Vivo X51 5G. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | - | Mali-G78 MP14 |
| MEMORY | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| RAM | 8 GB | LPDDR5 SDRAM - 12 GB | Samsung Galaxy S21 Ultra 5G has more RAM than Vivo X51 5G. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 256 GB | 128 GB | Vivo X51 5G has more internal memory than Samsung Galaxy S21 Ultra 5G. |
| User Memory | - | 101.7 GB |
| CAMERA | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 4 | |
|---|---|---|---|
| Sensor Resolution | 48 Megapixel | 12 Megapixel | Vivo X51 5G has better camera resolution than Samsung Galaxy S21 Ultra 5G. |
| Lens Type | - | Ultra wide-angle lens | |
| Lens Aperture | F/1.6 | F/2.2 | Vivo X51 5G has better lens aperture than Vivo X51 5G. |
| Field of View (FoV) | - | 120 degree(s) | |
| Pixel Size | - | 1.4 μm | |
| Optical Image Stabiliser (OIS) | - | Optical Image Stabiliser (OIS) | Samsung Galaxy S21 Ultra 5G has optical stabilisation. |
| Focus Adjustment | Automatic | Automatic | |
| Laser Auto Focus | Yes | Yes | |
| Optical Zoom | - | 3x | |
| Digital Zoom | - | 100x | |
| Self-Timer Delay | - | Yes | |
| Special Effects | HDR | Face retouch, Grid Line | |
| HDR Mode | - | Auto HDR mode | |
| Camera Modes | Panorama, Time-lapse mode, Pro mode, Live Photos, AI makeup, Portrait, Super Night mode, astro mode, pro sports mode, DOC mode | Panorama, Slow motion mode, Pro mode, HYPERLAPSE, Super Slow-mo, Flowers, Greenery, Trees, Sky, Beaches, Watersides, Snow, Backlit, Text, Food, Face, Baby, Person, Dog, Cat, People, Sunset, Sunrise, City, Waterfall, Scenery, Stage, Vehicles, Drinks, Animal, Shoes, Indoor, Clothes, Night view, Night, Motion Photo, Mountain, Single Take, Pro Video, Director's View | |
| Light Source | LED flash | High CRI LED flash | |
| Video Resolutions | - | 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, 3840 x 2160 (4K) at 60 fps, Super slow motion video 1280 x 720 (720p) at 960 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, 7680 x 4320 (UHD 8K) at 24fps, Hyperlapse 4K video support at 30 fps, Super Steady 1080p video support at 60 fps | |
| Camera Features (Functions) | 60x Hyper Zoom, Gimbal Super Night Master, Gimbal Super Sport Expert | Playback zoom, blink detection, VDIS (Video Digital Image Stabilisation), Tracking AF, Video location tags, Scene Optimiser, Flaw detection, Shot suggestions, blur detection, HDR10+ recording, Super steady, Quick Measure, Zoom-In Mic, Space Zoom, Take 33MP still photos while playing 8K video, Hybrid Optic Zoom 3x, Super Resolution Zoom up to 30x, Digital zoom up to 12x for video |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 13 Megapixel | 108 Megapixel | Samsung Galaxy S21 Ultra 5G has better second camera resolution than Vivo X51 5G. |
|---|---|---|---|
| Sensor Size (2nd Camera) | - | 1/1.33" | |
| Lens Type (2nd Camera) | - | Wide-angle lens | |
| Lens Aperture (2nd Camera) | F/2.46 | F/1.8 | Samsung Galaxy S21 Ultra 5G has better second camera lens aperture than Vivo X51 5G. |
| Field of View (2nd Camera) | - | 83 degree(s) | |
| Pixel Size (2nd Camera) | - | 0.8 μm | |
| Camera Features (2nd Camera) | - | Phase Detect Auto-Focus (PDAF), OIS (Optical Image Stabilisation) |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 8 Megapixel | 10 Megapixel | Samsung Galaxy S21 Ultra 5G has higher resolution third camera than Vivo X51 5G. |
|---|---|---|---|
| Lens Type (3rd Camera) | Wide-angle lens | Telephoto lens | |
| Lens Aperture (3rd Camera) | F/2.2 | F/2.4 | Vivo X51 5G has better third camera lens aperture than Vivo X51 5G. |
| Field of View (3rd Camera) | - | 35 degree(s) | |
| Pixel Size (3rd Camera) | - | 1.22 μm | |
| Camera Features (3rd Camera) | - | Dual Pixel AF |
| FOURTH CAMERA |
|---|
| Sensor Resolution (4th Camera) | 8 Megapixel | 10 Megapixel | Samsung Galaxy S21 Ultra 5G has higher resolution fourth camera than Vivo X51 5G. |
|---|---|---|---|
| Lens Type (4th Camera) | Telephoto lens | Telephoto lens | |
| Lens Aperture (4th Camera) | F/3.4 | F/4.9 | Vivo X51 5G has better fourth camera lens aperture than Vivo X51 5G. |
| Field of View (4th Camera) | - | 10 degree(s) | |
| Pixel Size (4th Camera) | - | 1.22 μm | |
| Camera Features (4th Camera) | - | Dual Pixel AF |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 32 Megapixel | 40 Megapixels | Samsung Galaxy S21 Ultra 5G has better front camera resolution than Vivo X51 5G. |
| Lens Aperture (Front) | F/2.45 | F/2.2 | Samsung Galaxy S21 Ultra 5G has better front lens aperture than Vivo X51 5G. |
| Field of View (Front) | - | 80 degree(s) | |
| Pixel Size (Front) | - | 0.7 μm | |
| Focus Adjustment | - | Automatic | |
| Special Effects (Front) | HDR | - | |
| Camera Modes (Front) | Live Photos, Portrait | - | |
| Camera Features (Front) | 2 x digital zoom | Phase Detect Auto-Focus (PDAF) |
| BATTERY AND CHARGING | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Battery Capacity (Battery Size) | 4315 mAh | 5000 mAh | Samsung Galaxy S21 Ultra 5G has larger battery capacity than Vivo X51 5G. |
|---|---|---|---|
| Fast Charging Technology | - | Qualcomm Quick Charge 2.0, Adaptive Fast Charging, Samsung Super Fast Charging, Power Delivery 3.0 | Samsung Galaxy S21 Ultra 5G has fast charging technology. |
| Wireless Charging | - | Yes | Samsung Galaxy S21 Ultra 5G can be charged wirelessly. |
| Wireless Charging Standards | - | WPC, Qi, Fast Wireless Charging 2.0, Wireless PowerShare | |
| Talk Time | - | 2460 minutes | |
| Run Time Details | - | Talk (4G): up to 2460 min Active online usage (LTE): up to 18 hrs Active online usage (Wi-Fi): up to 18 hrs Playback (wireless video): up to 22 hrs Playback (wireless audio): up to 81 hrs |
| CELLULAR | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Technology | CDMA2000 1X / GSM / WCDMA (UMTS) | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 5G | Both phones have the same mobile network generation. |
| Operating System | Funtouch OS 10 (based on Android 10) | Android 11 | |
| Intelligent Assistant | - | Bixby | |
| Payment Technology | - | Samsung Pay | |
| Navigation | GPS, GLONASS, BeiDou, Galileo | GPS, GLONASS, BeiDou, Galileo |
| COMMUNICATIONS | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Data Transmission | FDD-LTE, TDD-LTE, 5G NR FR1 | FDD-LTE, TDD-LTE, 5G NR FR1 | |
|---|---|---|---|
| 2G Band | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM, 800 CDMA2000 1X | 850 GSM, 900 GSM, 1800 GSM, 1900 GSM | |
| 3G UMTS Band | Band 1, Band 2, Band 4, Band 5, Band 8 | Band 1, Band 2, Band 4, Band 5, Band 8 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 1900, 1700, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 4, Band 5, Band 7, Band 8, Band 12, Band 17, Band 18, Band 19, Band 20, Band 26, Band 28, Band 32, Band 38, Band 39, Band 40, Band 41, Band 66 | 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 32, Band 38, Band 39, Band 40, Band 41, Band 66 | |
| 4G LTE Frequency | FDD 2100, FDD 1900 PCS, FDD 1800+, FDD 1700 - 2110 AWS, FDD 850, FDD 2600, FDD 900, FDD 700a, FDD 700b, FDD 800 lower, FDD 800 upper, FDD 800 DD, FDD 850+, FDD 700 APT, FDD 1500 L, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | 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 1500 L, TDD 2600, TDD 1900, TDD 2300, TDD 2500, FDD 1700 - 2110 AWS-3 | |
| 5G NR Band | N1, n3, n7, n8, n28, n38, n41, n77, n78 | N1, n3, n5, n7, n8, n20, n28, n38, n41, n66, n77, n78, n40 | |
| 5G NR Frequency | FDD 2100, FDD 1800, FDD 2600, FDD 900, FDD 700APT, TDD TD 2600, TDD TD 2500, TDD TD 3700, TDD TD 3500 | FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, FDD AWS-3, TDD TD 3700, TDD TD 3500, TDD 2300 | |
| Wireless Interface | Wi-Fi | IEEE 802.11a/b/g/n/ac/ax | |
| Bluetooth | Bluetooth 5.1 | Bluetooth 5.2 | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| MEDIA | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Supported Digital Audio Standards | WAV, MPEG 2 Audio, MP3, FLAC, MIDI, APE (Monkey's Audio), AMR-WB, AMR-NB, Vorbis | WAV, WMA, AAC, PCM, AMR, MP3, FLAC, XMF, OGG, MIDI, APE (Monkey's Audio), M4A, DSF, DSD, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, DFF, MID, DSD64, DSD128 | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, AVI, 3GP, TS, MP4 | MKV, FLV, AVI, WMV, ASF, 3GP, M4V, WebM, 3G2, MP4 | |
| Sound Enhancements | - | Dolby Digital Plus sound, Dolby Atmos sound technology, Surround sound, stereo speakers tuned by AKG, Dolby Digital sound | |
| Audio Amplifier | AK4377A | - |
| FEATURES | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| 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, digital compass | Accelerometer, ambient light sensor, proximity sensor, barometer, gyro sensor, hall sensor, geomagnetic sensor | |
| Security Devices | Fingerprint reader | Fingerprint reader (under display), face recognition | |
| Additional Phone Features | - | Air View, MIMO technology, Smart Select, Samsung KNOX, Smart View, Live message, Screen off memo, Bixby Vision, Dual Audio, Bixby Routines, Intelligent Performance Enhancer, AR Doodle, PENUP, Bixby key, Samsung Knox Vault, Private Share function, Enhanced Game Booster, Air Command |
| OTHERS | Vivo X51 5G | Samsung Galaxy S21 Ultra 5G |
|---|
| Included Accessories | Headset, USB cable, power adapter, SIM card removal tool, USB-C to 3.5 jack adapter, protective case, protective film | SIM card removal tool, USB-C to USB-C cable | |
|---|---|---|---|
| Compliant Standards | IP53 | IP68, HAC (Hearing Aid Compatible) | |
| Max Depth of Water Resistance | - | 1.5 m |
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