In depth comparison and review of Samsung Galaxy S21 Ultra 5G and ASUS Zenfone 8 Flip. 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 | ASUS Zenfone 8 Flip |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | SM-G998B/DS | ZS672KS | |
| Form Factor | Touch | Touch | |
| Height | 161.5 mm | 165.04 mm | ASUS Zenfone 8 Flip has greater height than Samsung Galaxy S21 Ultra 5G. |
| Width | 75.6 mm | 77.28 mm | ASUS Zenfone 8 Flip has greater width than Samsung Galaxy S21 Ultra 5G. |
| Depth | 8.9 mm | 9.6 mm | Samsung Galaxy S21 Ultra 5G is narrower than Samsung Galaxy S21 Ultra 5G. |
| Weight | 227 g | 230 g | Samsung Galaxy S21 Ultra 5G is lighter than Samsung Galaxy S21 Ultra 5G. |
| Body Colour | Phantom silver | Phantom black | Phantom navy | Phantom brown | Phantom titanium | Galactic black | |
| Body Material | - | Glass | |
| Protection | Dustproof, splashproof, water-resistant | - | |
| Waterproof (Water-resistant) | Yes | - | Samsung Galaxy S21 Ultra 5G is waterproof. |
| IP rating | IP68 | - | |
| SAR Value | 1.58 W/kg (body), 0.714 W/kg (head), 2.56 W/kg (limb) | 1.43 W/kg (head), 1.245 W/kg (body), 3.504 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 | ASUS Zenfone 8 Flip |
|---|
| Display Type | OLED display | OLED display | |
|---|---|---|---|
| Display Technology | Infinity-O Dynamic AMOLED 2X | AMOLED | |
| Screen Size (Display Size) | 6.8" | 6.67" | Samsung Galaxy S21 Ultra 5G has larger screen size than ASUS Zenfone 8 Flip. |
| Screen Resolution (Display Resolution) | 3200 x 1440 pixels | 2400 x 1080 pixels | Samsung Galaxy S21 Ultra 5G has better screen resolution than ASUS Zenfone 8 Flip. |
| Display Format | QHD+ | Full HD+ | |
| Pixel Density | 515 ppi | - | |
| Aspect Ratio | - | 20:9 | |
| Max Brightness | - | 1000 cd/m² | |
| Colour Depth | 16.7 million colours | - | |
| HDR | Yes | Yes | Both phones have HDR. |
| HDR Technology | HDR10+ | HDR10+ | |
| Display Enhancement Technology | Eye Comfort Shield | DC Dimming | |
| Display Refresh Rate | 120 Hz | 90 Hz | Samsung Galaxy S21 Ultra 5G has better refresh rate than ASUS Zenfone 8 Flip. |
| Display Features | Edge Screen, AOD(Always On Display) | ASUS Glove Touch technology, Delta-E < 1, NanoEdge display, 105% NTSC, 110% DCI-P3 | |
| Display Protection (Screen Protector) | Corning Gorilla Glass Victus (scratch resistant glass) | Corning Gorilla Glass 6 (scratch resistant glass) |
| PROCESSOR | Samsung Galaxy S21 Ultra 5G | ASUS Zenfone 8 Flip |
|---|
| Processor Type (CPU) | Samsung Exynos 2100 | Qualcomm Snapdragon 888 5G | |
|---|---|---|---|
| Processor Number | - | SM8350 | |
| Clock Speed | 2.9 GHz | 2.84 GHz | Samsung Galaxy S21 Ultra 5G has higher clock speed than ASUS Zenfone 8 Flip. |
| Processor Core Qty | 8-core | 8-core | Both phones have the same number of phone cores. |
| Graphics System (GPU) | Mali-G78 MP14 | Qualcomm ADRENO 660 |
| MEMORY | Samsung Galaxy S21 Ultra 5G | ASUS Zenfone 8 Flip |
|---|
| RAM | LPDDR5 SDRAM - 12 GB | LPDDR5 SDRAM - 8 GB | Samsung Galaxy S21 Ultra 5G has more RAM than ASUS Zenfone 8 Flip. |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 128 GB | 256 GB | ASUS Zenfone 8 Flip has more internal memory than Samsung Galaxy S21 Ultra 5G. |
| User Memory | 101.7 GB | - | |
| Memory Interface | - | UFS 3.1 | |
| Supported Flash Memory Cards (Expandable Memory) | - | microSDHC, microSD, microSDXC - up to 2 TB |
| CAMERA | Samsung Galaxy S21 Ultra 5G | ASUS Zenfone 8 Flip |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 4 | 3 | |
|---|---|---|---|
| Rear Camera Design | - | Flip | |
| Sensor Resolution | 12 Megapixel | 64 Megapixel | ASUS Zenfone 8 Flip has better camera resolution than Samsung Galaxy S21 Ultra 5G. |
| Sensor Size | - | 1/1.7" | |
| Sensor Name | - | Sony Exmor RS IMX686 sensor | |
| Lens Type | Ultra wide-angle lens | Wide-angle lens | |
| Lens Aperture | F/2.2 | F/1.8 | ASUS Zenfone 8 Flip has better lens aperture than Samsung Galaxy S21 Ultra 5G. |
| Field of View (FoV) | 120 degree(s) | 78.3 degree(s) | Samsung Galaxy S21 Ultra 5G has larger lens field of view than ASUS Zenfone 8 Flip. |
| Pixel Size | 1.4 μm | 0.8 μm | Samsung Galaxy S21 Ultra 5G has larger camera pixel size than ASUS Zenfone 8 Flip. |
| Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | Both phones have optical image stabilization. |
| Focus Adjustment | Automatic | - | |
| Laser Auto Focus | Yes | - | |
| Minimum Focal Length (Focal Distance) | - | 26.6 mm | |
| Optical Zoom | 3x | - | |
| Digital Zoom | 100x | - | |
| Self-Timer Delay | Yes | - | |
| Special Effects | Face retouch, Grid Line | - | |
| 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 | Slow motion video, Time-lapse mode, Pro mode, Auto Panorama | |
| Light Source | High CRI LED flash | 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 | 1920 x 1080 (1080p) at 30 fps, 1920 x 1080 (1080p) at 60 fps, 1280 x 720 (720p) at 30 fps, 3840 x 2160 (4K) at 30 fps, 3840 x 2160 (4K) at 60 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, Slo-mo video 1280 x 720 (720p) at 480 fps, 7680 x 4320 (8K) at 30fps, Slo-mo video 3840 x 2160 (4K) at 120 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 | Phase Detect Auto-Focus (PDAF), 3-axis electronic image stabilisation, Wind Noise Filter, Motion tracking, Quad Bayer technology, HyperSteady, Free Zoom, Mic Focus, 2x1 On-Chip Lens (OCL), Quick Flip Angle camera |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | 108 Megapixel | 12 Megapixel | Samsung Galaxy S21 Ultra 5G has better second camera resolution than ASUS Zenfone 8 Flip. |
|---|---|---|---|
| Sensor Size (2nd Camera) | 1/1.33" | 1/2.55" | ASUS Zenfone 8 Flip has better second camera sensor size than Samsung Galaxy S21 Ultra 5G. |
| Sensor Name (2nd Camera) | - | Sony Exmor RS IMX363 sensor | |
| 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. |
| Field of View (2nd Camera) | 83 degree(s) | - | |
| Pixel Size (2nd Camera) | 0.8 μm | 1.4 μm | ASUS Zenfone 8 Flip has larger second camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Minimum Focal Length (2nd Camera) | - | 14.3 mm | |
| Camera Features (2nd Camera) | Phase Detect Auto-Focus (PDAF), OIS (Optical Image Stabilisation) | Dual Pixel Phase Detect Auto-Focus (PDAF), Real-time distortion correction, Dual Pixel image sensor, 4cm macro photography |
| THIRD CAMERA |
|---|
| Sensor Resolution (3rd Camera) | 10 Megapixel | 8 Megapixel | Samsung Galaxy S21 Ultra 5G has higher resolution third camera than ASUS Zenfone 8 Flip. |
|---|---|---|---|
| Sensor Size (3rd Camera) | - | 1/2.55" | |
| Lens Type (3rd Camera) | Telephoto lens | Telephoto lens | |
| Lens Aperture (3rd Camera) | F/2.4 | - | |
| Field of View (3rd Camera) | 35 degree(s) | - | |
| Pixel Size (3rd Camera) | 1.22 μm | 1.4 μm | ASUS Zenfone 8 Flip has larger third camera pixel size than Samsung Galaxy S21 Ultra 5G. |
| Optical Zoom | - | 3x | |
| Digital Zoom | - | 12x | |
| Camera Features (3rd Camera) | Dual Pixel AF | Dual Pixel image sensor |
| 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 | 0 | |
|---|---|---|---|
| Sensor Resolution (Front) | 40 Megapixels | - | |
| Lens Aperture (Front) | F/2.2 | - | |
| Field of View (Front) | 80 degree(s) | - | |
| Pixel Size (Front) | 0.7 μm | - | |
| Focus Adjustment | Automatic | - | |
| Camera Features (Front) | Phase Detect Auto-Focus (PDAF) | - |
| BATTERY AND CHARGING | Samsung Galaxy S21 Ultra 5G | ASUS Zenfone 8 Flip |
|---|
| Battery Capacity (Battery Size) | 5000 mAh | 5000 mAh | Both phones have the same battery capacity. |
|---|---|---|---|
| Fast Charging Technology | Qualcomm Quick Charge 2.0, Adaptive Fast Charging, Samsung Super Fast Charging, Power Delivery 3.0 | Qualcomm Quick Charge 4.0, Power Delivery 3.0 | Both phones have fast charging technology. |
| Recharge Time (Charging Time) | - | 1.7 hours | |
| 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 |
- | |
| Battery Technology | - | Lithium polymer |
| CELLULAR | Samsung Galaxy S21 Ultra 5G | ASUS Zenfone 8 Flip |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 5G | 5G | Both phones have the same mobile network generation. |
| Operating System | Android 11 | Android 11 | |
| User Interface | - | ASUS ZenUI 8.0 | |
| Intelligent Assistant | Bixby | - | |
| Payment Technology | Samsung Pay | - | |
| Navigation | GPS, GLONASS, BeiDou, Galileo | GPS, GLONASS, BeiDou, Galileo, QZSS, NavIC |
| COMMUNICATIONS | Samsung Galaxy S21 Ultra 5G | ASUS Zenfone 8 Flip |
|---|
| Data Transmission | FDD-LTE, TDD-LTE, 5G NR FR1 | GPRS, EDGE, HSPA+, FDD-LTE, TDD-LTE, DC-HSPA+, 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 3, Band 4, Band 5, Band 6, Band 8, Band 19 | |
| 3G UMTS Frequency | 2100, 1900, 1700, 850, 900 | 2100, 1900, 1800, 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 34, Band 38, Band 39, Band 40, Band 41, Band 42 | |
| 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, TDD 2000, TDD 2600, TDD 1900, TDD 2300, TDD 2500, TDD 3500 | |
| 5G NR Band | N1, n3, n5, n7, n8, n20, n28, n38, n41, n66, n77, n78, n40 | N1, n2, n3, n5, n7, n8, n20, n28, n38, n77, n78, n12 | |
| 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 1900PCS, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 3700, TDD TD 3500, n12 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac/ax | IEEE 802.11a/b/g/n/ac/ax, Wi-Fi 6E | |
| Bluetooth | Bluetooth 5.2 | Bluetooth 5.2 EDR | |
| Bluetooth Profiles | - | A2DP | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| Modem | - | Snapdragon X60 5G |
| MEDIA | Samsung Galaxy S21 Ultra 5G | ASUS Zenfone 8 Flip |
|---|
| 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 | Apt-X, apt-X HD | |
|---|---|---|---|
| Supported Digital Video Standards | 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 | Dirac HD Sound, Hi-Res audio certified, OZO Audio, Qualcomm aptX Adaptive | |
| Audio Amplifier | - | Dual NXP TFA9874 |
| FEATURES | Samsung Galaxy S21 Ultra 5G | ASUS Zenfone 8 Flip |
|---|
| Phone Functions | 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, digital compass, gyro sensor, G-sensor, hall sensor, gyroscope | |
| Security Devices | Fingerprint reader (under display), face recognition | 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 | MIMO technology, Power Saving Mode, AudioWizard, Smart Key, One Hand Mode, ASUS Noise Reduction technology, ARCore, dual stereo speakers, triple noise reduction microphones, system mode |
| OTHERS | Samsung Galaxy S21 Ultra 5G | ASUS Zenfone 8 Flip |
|---|
| Included Accessories | SIM card removal tool, USB-C to USB-C cable | SIM card removal tool, USB-C to USB-C cable, protective case, power adapter (30 W) | |
|---|---|---|---|
| Compliant Standards | IP68, HAC (Hearing Aid Compatible) | - | |
| Max Depth of Water Resistance | 1.5 m | - |
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