In depth comparison and review of ASUS ZenFone Zoom (ZX551ML) and Samsung Galaxy Z Flip4. 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 | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| Product Type | Smartphone | Smartphone | |
|---|---|---|---|
| Manufacturer Model Number | ZX551ML | SM-F721B | |
| Form Factor | Touch | Folder (flip) - touch screen, dual screen | |
| Height | 158.9 mm | 165.2 mm | Samsung Galaxy Z Flip4 has greater height than ASUS ZenFone Zoom (ZX551ML). |
| Width | 78.8 mm | 71.9 mm | ASUS ZenFone Zoom (ZX551ML) has greater width than Samsung Galaxy Z Flip4. |
| Depth | 12 mm | 6.9 mm | Samsung Galaxy Z Flip4 is narrower than ASUS ZenFone Zoom (ZX551ML). |
| Weight | 185 g | 187 g | ASUS ZenFone Zoom (ZX551ML) is lighter than ASUS ZenFone Zoom (ZX551ML). |
| Dimensions Details | - | Unfolded - 71.9 mm x 6.9 mm x 165.2 mm Folded - 71.9 mm x 17.1 mm x 84.9 mm |
|
| Body Colour | Ceramic white | Pure black | Blue | Bora purple | Pink gold | Graphite | |
| Body Material | - | Corning Gorilla Glass Victus, Armour Aluminium frame | |
| Protection | - | Water-resistant | |
| Waterproof (Water-resistant) | - | Yes | Samsung Galaxy Z Flip4 is waterproof. |
| IP rating | - | IPX8 | |
| SAR Value | 0.432 W/kg (body), 0.343 W/kg (head) | 2.75 W/kg (limb), 1.151 W/kg (head), 1.198 W/kg (body) | |
| Connector Type | Headset jack - mini-phone 3.5mm Micro-USB - 5 pin Micro-USB Type B |
USB Type-C - 24 pin USB-C | |
| SIM Card Type (Size) | Micro SIM | Nano SIM, Electronic SIM card (e-SIM) | |
| SIM Card Qty | - | Dual-SIM |
| DISPLAY | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| Display Type | LCD display | OLED display | |
|---|---|---|---|
| Display Technology | IPS | Dynamic AMOLED 2X | |
| Foldable Display | - | Yes | |
| Display Design | - | Inward folding | |
| Screen Size (Display Size) | 5.5" | 6.7" | Samsung Galaxy Z Flip4 has larger screen size than ASUS ZenFone Zoom (ZX551ML). |
| Screen Resolution (Display Resolution) | 1920 x 1080 pixels | 2640 x 1080 pixels | Samsung Galaxy Z Flip4 has better screen resolution than ASUS ZenFone Zoom (ZX551ML). |
| Display Format | Full HD | Full HD+ | |
| Pixel Density | 401 ppi | 425 ppi | Samsung Galaxy Z Flip4 has better pixel density than ASUS ZenFone Zoom (ZX551ML). |
| Colour Depth | 16.7 million colours | 16.7 million colours | Both phones have the same color depth. |
| HDR | - | Yes | Samsung Galaxy Z Flip4 has HDR. |
| HDR Technology | - | HDR10+ | |
| Display Refresh Rate | - | 120 Hz | |
| Display Features | - | AOD(Always On Display), Video Wallpaper | |
| Display Protection (Screen Protector) | Corning Gorilla Glass 4 (scratch resistant glass) | Samsung Ultra Thin Glass |
| SECOND DISPLAY |
|---|
| Second Display Type | - | OLED display - colour | |
|---|---|---|---|
| Second Display Screen Size | - | 1.9" | |
| Second Display Resolution | - | 512 x 260 pixels | |
| Second Display Colour Depth | - | 16.7 million colours |
| UNFOLDED DISPLAY |
|---|
| Unfolded Display Screen Size | - | 6.7 in | |
|---|---|---|---|
| Unfolded Display Resolution | - | 2640 x 1080 pixels |
| PROCESSOR | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| Processor Type (CPU) | Intel Atom | - | |
|---|---|---|---|
| Processor Number | Z3590 | - | |
| Clock Speed | 2.5 GHz | 3.18 GHz | Samsung Galaxy Z Flip4 has higher clock speed than ASUS ZenFone Zoom (ZX551ML). |
| Processor Core Qty | Quad-core | 8-core | Samsung Galaxy Z Flip4 has higher processor core quantity than ASUS ZenFone Zoom (ZX551ML). |
| Graphics System (GPU) | PowerVR G6430 | - |
| MEMORY | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| RAM | 4 GB | 8 GB | Samsung Galaxy Z Flip4 has more RAM than ASUS ZenFone Zoom (ZX551ML). |
|---|---|---|---|
| Internal Memory Size (Storage Capacity) | 32 GB | 128 GB | Samsung Galaxy Z Flip4 has more internal memory than ASUS ZenFone Zoom (ZX551ML). |
| User Memory | - | 99.8 GB | |
| Memory Interface | - | UFS 3.1 | |
| Supported Flash Memory Cards (Expandable Memory) | microSDHC, microSDXC - up to 128 GB | - |
| CAMERA | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| MAIN CAMERA |
|---|
| Number of Main Cameras | 1 | 2 | |
|---|---|---|---|
| Sensor Resolution | 13 Megapixel | 12 Megapixel | ASUS ZenFone Zoom (ZX551ML) has better camera resolution than Samsung Galaxy Z Flip4. |
| Lens Type | - | Wide-angle lens | |
| Lens Aperture | F/2.7-4.8 | F/1.8 | Samsung Galaxy Z Flip4 has better lens aperture than ASUS ZenFone Zoom (ZX551ML). |
| Field of View (FoV) | - | 83 degree(s) | |
| Pixel Size | - | 1.8 μm | |
| Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | Optical Image Stabiliser (OIS) | Both phones have optical image stabilization. |
| Focus Adjustment | Automatic | Automatic | |
| Laser Auto Focus | Yes | - | |
| Digital Zoom | 3x | 10x | Samsung Galaxy Z Flip4 has better digital zoom than ASUS ZenFone Zoom (ZX551ML). |
| Self-Timer Delay | - | Yes | |
| Special Effects | - | HDR, Grid Line | |
| HDR Mode | Auto HDR mode | - | |
| Camera Modes | Panorama | Panorama, Slow motion mode, Pro mode, HYPERLAPSE, Quick Shot, 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, Portrait, Night, Mountain, Filter mode, Single Take, Pro Video, Portrait video, Director's View | |
| Face Recognition (Face ID) | Face detection | - | ASUS ZenFone Zoom (ZX551ML) has face detection. |
| Light Source | Dual LED flash | High CRI LED flash | |
| Video Resolutions | 1920 x 1080 (1080p) | 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, Super slow motion video 1280 x 720 (720p) at 960 fps, Slo-mo video 1920 x 1080 (1080p) at 240 fps, Hyperlapse 4K video support at 30 fps, Super Steady 1080p video support at 30 fps | |
| Camera Features (Functions) | - | Playback zoom, Motion photo, QR-code scanner, RAW image capture, VDIS (Video Digital Image Stabilisation), Tracking AF, Video location tags, Dual Pixel Autofocus technology, AR sticker, Scene Optimiser, Flaw detection, Shot suggestions, AR Emoji, HDR10+ recording, Super steady, HEIF image capture, AR Doodle, Microphone Control, HEVC (High Efficiency Video coding), Dual preview, Auto framing, Corning Gorilla Glass DX (protective lens glass), Auto FPS, AR Emoji Studio, Deco PIC, FlexCam |
| SECOND CAMERA |
|---|
| Sensor Resolution (2nd Camera) | - | 12 Megapixel | |
|---|---|---|---|
| Lens Type (2nd Camera) | - | Ultra wide-angle lens | |
| Lens Aperture (2nd Camera) | - | F/2.2 | |
| Field of View (2nd Camera) | - | 123 degree(s) | |
| Pixel Size (2nd Camera) | - | 1.12 μm |
| FRONT CAMERA |
|---|
| Number of Front Cameras | 1 | 1 | |
|---|---|---|---|
| Sensor Resolution (Front) | 5 Megapixel | 10 Megapixel | Samsung Galaxy Z Flip4 has better front camera resolution than ASUS ZenFone Zoom (ZX551ML). |
| Lens Aperture (Front) | F/2.0 | F/2.4 | ASUS ZenFone Zoom (ZX551ML) has better front lens aperture than ASUS ZenFone Zoom (ZX551ML). |
| Field of View (Front) | - | 80 degree(s) | |
| Pixel Size (Front) | - | 1.22 μm | |
| Focus Adjustment | - | Focus free |
| BATTERY AND CHARGING | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| Battery Capacity (Battery Size) | 3000 mAh | 3700 mAh | Samsung Galaxy Z Flip4 has larger battery capacity than ASUS ZenFone Zoom (ZX551ML). |
|---|---|---|---|
| Fast Charging Technology | - | Qualcomm Quick Charge 2.0, Adaptive Fast Charging | Samsung Galaxy Z Flip4 has fast charging technology. |
| Wireless Charging | - | Yes | Samsung Galaxy Z Flip4 can be charged wirelessly. |
| Wireless Charging Standards | - | WPC, Qi, Fast Wireless Charging 2.0, Wireless PowerShare, Reverse wireless charging | |
| Talk Time | - | 2040 minutes | |
| Run Time Details | - | Talk (4G): up to 2040 min Active online usage (LTE): up to 16 hrs Active online usage (Wi-Fi): up to 16 hrs Playback (wireless video): up to 19 hrs Playback (wireless audio): up to 56 hrs |
|
| Battery Technology | Lithium polymer | - |
| CELLULAR | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| Technology | WCDMA (UMTS) / GSM | WCDMA (UMTS) / GSM | |
|---|---|---|---|
| Mobile Broadband Generation | 4G | 5G | Samsung Galaxy Z Flip4 has more advanced generation mobile network. |
| Operating System | Android 5.0 (Lollipop) | Android 12 | |
| User Interface | ASUS ZenUI 2.0 | One UI | |
| Intelligent Assistant | - | Bixby | |
| Payment Technology | - | Samsung Pay | |
| Navigation | A-GPS, GLONASS, BeiDou | GPS, GLONASS, BeiDou, Galileo, QZSS |
| COMMUNICATIONS | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| Data Transmission | GPRS, EDGE, HSDPA, HSUPA, HSPA+, LTE | FDD-LTE, TDD-LTE, LAA, 5G NR FR1 | |
|---|---|---|---|
| 2G Band | 850 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 | |
| 3G UMTS Frequency | - | 2100, 1900, 1700, 850, 900 | |
| 4G LTE Band | Band 1, Band 2, Band 3, Band 5, Band 7, Band 8, Band 9, Band 18, Band 19, Band 28 | 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 850, FDD 2600, FDD 900, FDD 1800, FDD 800 lower, FDD 800 upper, FDD 700 APT | 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, n2, n3, n5, n7, n8, n20, n28, n38, n41, n66, n75, n77, n78, n40, n25, n12 | |
| 5G NR Frequency | - | FDD 2100, FDD 1900PCS, FDD 1800, FDD 850, FDD 2600, FDD 900, FDD 800, FDD 700APT, TDD TD 2600, TDD TD 2500, FDD AWS-3, SDL DL 1500+, TDD TD 3700, TDD TD 3500, TDD 2300, FDD 1900, n12 | |
| Wireless Interface | IEEE 802.11a/b/g/n/ac | IEEE 802.11a/b/g/n/ac/ax | |
| Bluetooth | Bluetooth 4.0 | Bluetooth 5.2 LE | |
| Bluetooth Profiles | A2DP | - | |
| NFC | Yes | Yes | Both phones have an NFC reader for mobile payments. |
| Messaging Services | SMS, MMS | - |
| MEDIA | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| Supported Digital Audio Standards | - | WAV, AAC, PCM, AMR, MP3, FLAC, XMF, OGG, MIDI, APE (Monkey's Audio), M4A, DSF, MXMF, OGA, 3GA, AWB, IMY, RTTTL, RTX, OTA, DFF, MID, DSD64, DSD128 | |
|---|---|---|---|
| Supported Digital Video Standards | - | MKV, FLV, AVI, 3GP, M4V, WebM, 3G2, MP4 | |
| Sound Enhancements | - | Dolby Digital Plus sound, Dolby Atmos sound technology, Dolby Digital sound |
| FEATURES | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| Phone Functions | Speakerphone, call timer, conference call, vibrating alert | - | |
|---|---|---|---|
| Sensors | Accelerometer, proximity sensor, digital compass, gyro sensor | Accelerometer, proximity sensor, barometer, gyro sensor, hall sensor, geomagnetic sensor, light sensor | |
| Security Devices | - | Face recognition, fingerprint reader (side) | |
| Additional Phone Features | Multitasking | MIMO technology, Samsung KNOX, High AOP Mic, Bixby Vision, Secure Folder function, TalkBack, Dual Audio, Bixby Routines, Intelligent Performance Enhancer, Samsung Smart Switch, Flex mode |
| OTHERS | ASUS ZenFone Zoom (ZX551ML) | Samsung Galaxy Z Flip4 |
|---|
| Included Accessories | Power adapter | SIM card removal tool, USB-C cable | |
|---|---|---|---|
| Compliant Standards | - | VDE, IPX8 | |
| Max Depth of Water Resistance | - | 1.5 m |
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