In depth comparison and review of Samsung Galaxy S21 Ultra 5G and OPPO Reno4 5G. 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 | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 5G |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | SM-G998B/DS | CPH2091 | |
| Form Factor | Touch | Touch | |
| Height | 161.5 mm | 159.3 mm | Samsung Galaxy S21 Ultra 5G has greater height than OPPO Reno4 5G. |
| Width | 75.6 mm | 74 mm | Samsung Galaxy S21 Ultra 5G has greater width than OPPO Reno4 5G. |
| Depth | 8.9 mm | 7.8 mm | OPPO Reno4 5G is narrower than Samsung Galaxy S21 Ultra 5G. |
| Weight | 227 g | 183 g | OPPO Reno4 5G is lighter than Samsung Galaxy S21 Ultra 5G. |
| Body Colour | Phantom silver | Phantom black | Phantom navy | Phantom brown | Phantom titanium | Space black | Galactic blue | |
| Protection | Dustproof, splashproof, water-resistant | - | |
| Waterproof (Water-resistant) | Yes | - | Samsung Galaxy S21 Ultra 5G is waterproof. |
| IP rating | IP68 | IP54 | |
| SAR Value | 1.58 W/kg (body), 0.714 W/kg (head), 2.56 W/kg (limb) | 0.886 W/kg (head), 1.155 W/kg (body), 2.165 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, Electronic SIM card (e-SIM) | Nano SIM | |
| SIM Card Qty | Dual-SIM | Dual-SIM |
| DISPLAY | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 5G |
|---|
| Display Type | OLED display | OLED display | |
|---|---|---|---|
| Display Technology | Infinity-O Dynamic AMOLED 2X | AMOLED | |
| Screen Size (Display Size) | 6.8" | 6.4" | Samsung Galaxy S21 Ultra 5G has larger screen size than OPPO Reno4 5G. |
| Screen Resolution (Display Resolution) | 3200 x 1440 pixels | 2400 x 1080 pixels | Samsung Galaxy S21 Ultra 5G has better screen resolution than OPPO Reno4 5G. |
| Display Format | QHD+ | Full HD+ | |
| Pixel Density | 515 ppi | 409 ppi | Samsung Galaxy S21 Ultra 5G has better pixel density than OPPO Reno4 5G. |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | - | 800 cd/m² | |
| Colour Depth | 16.7 million colours | 16.7 million colours | Both phones have the same color depth. |
| Contrast Ratio | - | 800000:1 | |
| HDR | Yes | - | Samsung Galaxy S21 Ultra 5G has HDR. |
| HDR Technology | HDR10+ | - | |
| Display Enhancement Technology | Eye Comfort Shield | - | |
| Display Refresh Rate | 120 Hz | 60 Hz | Samsung Galaxy S21 Ultra 5G has better refresh rate than OPPO Reno4 5G. |
| Display Features | Edge Screen, AOD(Always On Display) | DCI-P3 Wide colour gamut, Dark mode, 180Hz sampling rate | |
| Display Protection (Screen Protector) | Corning Gorilla Glass Victus (scratch resistant glass) | Corning Gorilla Glass (scratch resistant glass) |
| PROCESSOR | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 5G |
|---|
| Processor Type (CPU) | Samsung Exynos 2100 | Qualcomm Snapdragon 765G | |
|---|---|---|---|
| Clock Speed | 2.9 GHz | 2.4 GHz | Samsung Galaxy S21 Ultra 5G has higher clock speed than OPPO Reno4 5G. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | Mali-G78 MP14 | Qualcomm ADRENO 620 |
| MEMORY | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 5G |
|---|
| RAM | LPDDR5 SDRAM - 12 GB | LPDDR4X SDRAM - 8 GB | Samsung Galaxy S21 Ultra 5G has more RAM than OPPO Reno4 5G. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 128 GB | Both phones have the same internal memory capacity. |
| User Memory | 101.7 GB | - | |
| Memory Interface | - | UFS 2.1 |
| CAMERA | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 5G |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 3 | |
|---|---|---|---|
| Sensor Resolution | 12 Megapixel | 48 Megapixel | OPPO Reno4 5G has better camera resolution than Samsung Galaxy S21 Ultra 5G. |
| Sensor Size | - | 1/2" | |
| Sensor Name | - | Sony Exmor RS IMX586 sensor | |
| Lens Type | Ultra wide-angle lens | - | |
| Lens Aperture | F/2.2 | F/1.7 | OPPO Reno4 5G has better lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Lens Construction | - | 6-element | |
| Field of View (FoV) | 120 degree(s) | - | |
| Pixel Size | 1.4 μm | 0.8 μm | Samsung Galaxy S21 Ultra 5G has larger camera pixel size than OPPO Reno4 5G. |
| 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 | |
| Minimum Focal Length (Focal Distance) | - | 26 mm | |
| Optical Zoom | 3x | - | |
| Digital Zoom | 100x | - | |
| Self-Timer Delay | Yes | - | |
| Special Effects | Face retouch, Grid Line | HDR, Bokeh effect | |
| HDR Mode | Auto HDR mode | - | |
| Camera Modes | 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 | Time-lapse mode, night mode, Expert Mode, Text, AI Beautify, AI Portait, Pano mode, Dazzle Colour Mode | |
| Light Source | High CRI LED flash | LED flash | |
| Still Image Resolutions | - | 8000 x 6000 | |
| 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 | 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, Slo-mo video 1280 x 720 (720p) at 240 fps, 3840 x 2160 (4K) at 30 fps, 1280 x 720 (720p) at 60 fps | |
| Camera Features (Functions) | 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 | Noise reduction, Phase Detect Auto-Focus (PDAF), Electronic Image Stabiliser (EIS), Closed loop processing, 4-in-1 Pixel technology, Ultra Steady Video, contrast detection auto-focus (CDAF), laser detection auto focus (LDAF) |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 108 Megapixel | 8 Megapixel | Samsung Galaxy S21 Ultra 5G has better second camera resolution than OPPO Reno4 5G. |
|---|---|---|---|
| Sensor Size (2nd Camera) | 1/1.33" | - | |
| Lens Type (2nd Camera) | Wide-angle lens | Ultra wide-angle lens | |
| Lens Aperture (2nd Camera) | F/1.8 | F/2.2 | Samsung Galaxy S21 Ultra 5G has better second camera lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Lens Element Qty (2nd Camera) | - | 5-element | |
| Field of View (2nd Camera) | 83 degree(s) | 119 degree(s) | OPPO Reno4 5G has larger second camera lens field of view than Samsung Galaxy S21 Ultra 5G. |
| Pixel Size (2nd Camera) | 0.8 μm | - | |
| Minimum Focal Length (2nd Camera) | - | 16 mm | |
| Camera Functions (2nd Camera) | - | Monochrome | |
| Camera Modes (2nd Camera) | - | Ultra Night Mode 3.0 | |
| Camera Features (2nd Camera) | Phase Detect Auto-Focus (PDAF), OIS (Optical Image Stabilisation) | 5-piece lens, Ultra Steady Video Pro |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 10 Megapixel | 2 Megapixel | Samsung Galaxy S21 Ultra 5G has higher resolution third camera than OPPO Reno4 5G. |
|---|---|---|---|
| Lens Type (3rd Camera) | Telephoto lens | - | |
| Lens Aperture (3rd Camera) | F/2.4 | F/2.4 | Both phones have the same lens aperture of the third camera. |
| Lens Element Qty (3rd Camera) | - | 3-element | |
| 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) | 10 Megapixel | - | |
|---|---|---|---|
| Lens Type (4th Camera) | Telephoto lens | - | |
| Lens Aperture (4th Camera) | F/4.9 | - | |
| 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 | 2 | |
|---|---|---|---|
| Sensor Resolution (Front) | 40 Megapixels | 32 Megapixel | Samsung Galaxy S21 Ultra 5G has better front camera resolution than OPPO Reno4 5G. |
| Sensor Name (Front) | - | Sony Exmor RS IMX616 sensor | |
| Lens Aperture (Front) | F/2.2 | F/2.4 | Samsung Galaxy S21 Ultra 5G has better front lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Lens Element Qty (Front) | - | 5-element | |
| Field of View (Front) | 80 degree(s) | - | |
| Pixel Size (Front) | 0.7 μm | 0.8 μm | OPPO Reno4 5G has larger front camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Focus Adjustment | Automatic | - | |
| Camera Modes (Front) | - | Panorama, Time-lapse mode, Slow motion mode, night mode, Expert Mode, AI Beauty, Portrait | |
| Light Source (Front) | - | Display flash | |
| Still Image Resolutions (Front) | - | 6560 x 4928 | |
| Video Resolutions (Front) | - | 1920 x 1080 (1080p) at 30 fps, 1280 x 720 (720p) at 30 fps | |
| Camera Features (Front) | Phase Detect Auto-Focus (PDAF) | Electronic Image Stabiliser (EIS), 5P lens |
| SECOND FRONT CAMERA |
|---|
| Sensor Resolution (2nd Front) | - | 2 Megapixel | |
|---|---|---|---|
| Lens Aperture (2nd Front) | - | F/2.4 | |
| Pixel Size (2nd Front) | - | 1.75 μm | |
| Camera Functions (2nd Front) | - | Portait camera | |
| Camera Features (2nd Front) | - | 3-piece lens |
| BATTERY AND CHARGING | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 5G |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 4020 mAh | Samsung Galaxy S21 Ultra 5G has larger battery capacity than OPPO Reno4 5G. |
|---|---|---|---|
| Fast Charging Technology | Qualcomm Quick Charge 2.0, Adaptive Fast Charging, Samsung Super Fast Charging, Power Delivery 3.0 | SuperVOOC 2.0 Flash Charge | Both phones have fast charging technology. |
| Recharge Time (Charging Time) | - | 36 min | |
| Wireless Charging | Yes | - | Samsung Galaxy S21 Ultra 5G can be charged wirelessly. |
| Wireless Charging Standards | WPC, Qi, Fast Wireless Charging 2.0, Wireless PowerShare | - | |
| Standby Time | - | 390 hours | |
| Talk Time | 2460 minutes | 1560 minutes | Samsung Galaxy S21 Ultra 5G has longer battery life when making calls than OPPO Reno4 5G. |
| 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 |
Standby: up to 390 hrs Talk: up to 1560 min Playback (Music): up to 37 hrs Playback (video): up to 17.1 hrs |
| CELLULAR | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 5G |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 5G | Both phones have the same mobile network generation. |
| Operating System | Android 11 | ColorOS 7.2 (based on Android 10) | |
| Intelligent Assistant | Bixby | - | |
| Payment Technology | Samsung Pay | - | |
| Navigation | GPS, GLONASS, BeiDou, Galileo | GPS, A-GPS, GLONASS, BeiDou, Galileo, QZSS |
| COMMUNICATIONS | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 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 | 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 6, Band 8, Band 19 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 1900, 1700, 850, 800, 900, 800 | |
| 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 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 17, Band 18, Band 19, Band 20, 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 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 | 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 | |
| 5G NR Band | N1, n3, n5, n7, n8, n20, n28, n38, n41, n66, n77, n78, n40 | N1, n3, n5, n7, n8, n20, n28, n38, n41, n77, n78, n40 | |
| 5G NR Frequency | 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 | FDD 2100, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, TDD TD 3700, TDD TD 3500, TDD 2300 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac/ax | IEEE 802.11a/b/g/n/ac | |
| Bluetooth | Bluetooth 5.2 | Bluetooth 5.1 | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| MEDIA | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 5G |
|---|
| Supported Digital Audio Standards | 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 | WAV, WMA, AAC, AMR, MP3, FLAC, OGG, APE (Monkey's Audio), apt-X, LDAC, MID, SBC, apt-X HD, APTX-TWS+ | |
|---|---|---|---|
| Supported Digital Video Standards | MKV, FLV, AVI, WMV, ASF, 3GP, M4V, WebM, 3G2, MP4 | MKV, FLV, AVI, MOV, WMV, 3GP, MP4 | |
| Sound Enhancements | Dolby Digital Plus sound, Dolby Atmos sound technology, Surround sound, stereo speakers tuned by AKG, Dolby Digital sound | Dolby Atmos sound technology |
| FEATURES | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 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, barometer, gyro sensor, hall sensor, geomagnetic sensor | Accelerometer, ambient light sensor, proximity sensor, pedometer, gyro sensor, geomagnetic sensor, gravity sensor | |
| Security Devices | Fingerprint reader (under display), face recognition | Fingerprint reader (under display) | |
| 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 | MU-MIMO technology, Google Lens |
| OTHERS | Samsung Galaxy S21 Ultra 5G | OPPO Reno4 5G |
|---|
| Included Accessories | SIM card removal tool, USB-C to USB-C cable | Headphones, power adapter, SIM card removal tool, USB-C cable, protective case | |
|---|---|---|---|
| Compliant Standards | IP68, HAC (Hearing Aid Compatible) | IP54, TUV Rheinland Certified Safe Fast-Charge System | |
| Max Depth of Water Resistance | 1.5 m | - |
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