Asus Zenfone 5Z (ZS621KL 256GB) vs Asus Zenfone Zoom (ZX551ML 32GB)
Side by side comparison between Asus Zenfone 5Z vs Asus Zenfone Zoom (ZX551ML) phones, differences, pros, cons and full specifications. What's the better?
,
6.2"
IPS
IPS
1080x2246
12
MP
MP
8mp
8GB
RAM
RAM
Octa-core
3300
mAh
mAh
(Non removable)
vs
5.5"
IPS
IPS
1080x1920
13
MP
MP
5mp
4GB
RAM
RAM
Quad-core
3000
mAh
mAh
(Non removable)
What's the better phone? Asus Zenfone 5Z (ZS621KL 256GB)
The phonemore's choice is much more technical than personal. Therefore, you shouldn't only consider this. Our goal is to help you, but what's important to us may not be important to you. You decide which one is the best! Comment!
24 Advantages 
2 Advantages | 22 Common items in both devices |
| TFT IPS LCD |
| 16 million |
| Dual-LED flash |
| PDAF: phase detection autofocus / LDAF: laser detection autofocus |
| OIS (4-axis): Optical stabilization / OIS: Optical stabilization |
| 4G LTE-A / 4G LTE |
| Capacitive |
| +15 specs and more in the table below |
Check the comparison table below for more items that are not evaluated in comparison score above.
Highlight differences Clear highlight📱 Model features | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Model | Zenfone 5Z (ZS621KL 256GB) | Zenfone Zoom (ZX551ML 32GB) |
| Other model names | Asus Zenfone 5z 8GB RAM (ZS621KL), ASUS_Z01RD | Asus Zenfone Zoom ZX551ML (4G), Asus ZX551ML |
| Country or region available |  India |   (Latin America), (Europe) |
| Brand | Asus | Asus |
| Release date | 6/1/2018 | 12/1/2015 |
| Depth | 7.9 millimeters (0.31 inches) | 12 millimeters (0.47 inches) |
| Size (width x height) | 75.65 x 153 millimeters (2.98 x 6.02 in) | 78.8 x 158.9 millimeters (3.1 x 6.26 in) |
| Weight | 165 grams (5.78 ounces) | 185 grams (6.48 ounces) |
| Build, materials | Aluminum frame, glass front/back | Aluminum frame, glass front, leather back |
| Protection against water and others | Not supported | Not supported |
📲 Display | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Display type | TFT IPS LCD | TFT IPS LCD |
| Screen size | 6.2" inches | 5.5" inches |
| Screen-to-body ratio | ~83.7% (screen-to-body ratio) | ~66.6% (screen-to-body ratio) |
| Display resolution | 1080x2246 pixels (18.7:9) | 1080x1920 pixels |
| Touchscreen | Capacitive Multitouch 10-points | Capacitive Multitouch |
| Pixel density (dot pitch) | 402 PPI | 401 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass | Gorilla Glass 4 |
| Refresh rate | 60Hz | feature not registered |
| Display features | 550nits[typ] | feature not registered |
🤖 Operating System | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| System version | Android 8.0 Oreo | Android 5.0.2 Lollipop |
| Firmware update | Android 10 | Android 6.0 Marshmallow |
| User Interface | feature not registered | feature not registered |
⚙️ Processor | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Chipset | 64bit: Qualcomm Snapdragon 845 MSM8998 (10nm) | 64bit: Intel Atom Z3590 (22nm) |
| CPU | Octa-core, 2 processors: 4x 2.7GHz Kryo 385 Gold (Quad-core) 4x 1.7GHz Kryo 385 Silver (Quad-core) | Quad-core, 1 processor: 4x 2.5GHz Intel Silvermont (Quad-core) |
| GPU graphical controller | Qualcomm Adreno 630 710Mhz | PowerVR G6430 MP4 |
| Performance (benchmark) | feature not registered | feature not registered |
💽 Memory and storage | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| RAM memory | 8GB LPDDR4X | 4GB LPDDR3 |
| Internal storage | 256GB (240GB available) UFS 2.1 | 32GB (26GB available) |
| External storage | Until 1TB microSD, microSDXC (hybrid slot/shares the same SIM-2 slot) | Until 128GB microSD, microSDXC (dedicated slot) |
📶 Mobile networks | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Dual-SIM | Dual-SIM Standby - Call active on one sim card (hybrid slot/shares the same microSD slot) | Not supported |
| SIM card | 2 slots (Dual-SIM) nano-SIM (4FF) | 1 slot (Single-SIM) micro-SIM (3FF) |
| Maximum Download / Upload | 800/100 Mbps | 150/50 Mbps |
| Network technology | 2G, 3G, 4G | 2G, 3G, 4G |
| Frequency, bands | Expand band details Collapse details | |
| GSM MHz band | Quad-Band 850/900/1800/1900 | Quad-Band 850/900/1800/1900 |
| Primary 2G network | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Primary 3G network | UMTS 800/850/900 | UMTS 850/900/1900/2100 |
| Primary 4G network | LTE Cat15 (Bands 1,2,3,5,7,8,18,19,20,26,28) TD-LTE (Bands 38,39,40,41) | LTE Cat4 (Bands 1, 2, 3, 5, 7, 8, 9, 18, 19, 28) |
| Primary 5G network | Not supported | Not supported |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, LTE |
| Secondary 2G network | GSM 850/900/1800/1900 | Not supported |
| Secondary 3G network | Not supported | Not supported |
| Secondary 4G network | Not supported | Not supported |
| Secondary data network | GPRS, EDGE | Not supported |
📷 Camera | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Back camera (main camera) | (dual camera) 12 megapixels 8MP ultrawide f/2.012mm1/4"1.12µmFF | 13 megapixels |
| Main camera resolution | 4000x3000 pixels | 4128x3096 pixels |
| Video recording (primary) | 4K UHD (3840x2160) 30 fps | Full HD (1920x1080) 30 fps |
| Flash | Dual-LED flash | Dual-LED flash |
| Focal aperture | f/1.8 (aperture) | f/2.7 (aperture) |
| Focal length | 24mm lens | 28mm lens |
| Sensor size | 1/2.55" inches | feature not registered |
| Pixel size | 1.4µm pixel | feature not registered |
| Autofocus | PDAF: phase detection autofocus | LDAF: laser detection autofocus |
| Touch focus | Supported | Supported |
| Image stabilization | OIS (4-axis): Optical stabilization | OIS: Optical stabilization |
| Zoom | Only digital zoom | Digital and optical zoom |
| Face/smile detection | Face detection, Smile detection | Face detection, Smile detection |
| BSI sensor | Not supported | Not supported |
| HDR | HDR photo on both cameras | HDR photo only main camera |
| Camera extras | feature not registered | feature not registered |
📸 Front camera | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Front camera (secondary) | 8 megapixels | 5 megapixels |
| Front camera resolution | 3264x2448 pixels | 2560x1920 pixels |
| Video recording (secondary) | Full HD (1920x1080) | HD (1280x720) |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.0 (aperture) | f/2.0 (aperture) |
| Focal length | 24mm lens | feature not registered |
| Sensor size | 1/4" inches | feature not registered |
| Pixel size | 1.12µm pixel | feature not registered |
🔉 Sound and multimedia | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Loudspeaker | Supported | Supported |
| Active noise cancellation | 2 microphones or more | Not supported |
| Radio | FM | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4, H.265, H.264, H.263 | MP4, H.264, H.263 |
| Audio formats | MP3, OGG, eAAC+, FLAC | MP3, WAV, eAAC+ |
🔌 Connectivity | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| USB | USB 2.0 Type-C, USB OTG On-The-Go | MicroUSB 2.0, USB OTG On-The-Go |
| Audio output | 3.5mm jack | 3.5mm jack |
| TV output | Not supported | Not supported |
| Bluetooth | 5.0 + A2DP/LE | 4.0 + A2DP |
| WiFi | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) WiFi Direct, hotspot | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) WiFi Direct, hotspot |
| DLNA | Not supported | Not supported |
| GPS | A-GPS, GeoTagging, GLONASS, BeiDou | A-GPS, GeoTagging, GLONASS, BeiDou |
| NFC | Supported | Supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Sensors | Accelerometer Ambient light sensor Compass Face unlock Fingerprint sensor (rear-mounted) Gyroscope Proximity sensor | Accelerometer Ambient light sensor Compass Gyroscope Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Battery type | Li-Ion: lithium-ion (Non removable) | LiPo: li-ion polymer (Non removable) |
| Battery capacity | 3300 mAh | 3000 mAh |
| Charger, watts | 18W (9V/2A) Wired fast charging | 18W Wired fast charging |
| Inductive / wireless charging | Not supported | feature not registered |
| Talk time autonomy | 25 hours (1 days) | feature not registered |
| Standby | feature not registered | feature not registered |
➕ Other features | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| Call control | Voice dialing, Voice recorder | Voice dialing, Voice recorder |
| Messaging | SMS (T9), MMS, E-mail, Push mail | SMS (T9), MMS, E-mail, Push mail |
| Hands-free calling | Supported | Supported |
| Video calling | Supported | Supported |
| Ringtones | Polyphonic and customized | Polyphonic and customized |
| Web browser | HTML, XHTML, HTML5 | HTML, XHTML, HTML5 |
| Antenna | Internal antenna | Internal antenna |
| Qwerty physical keyboard | Not supported | Not supported |
| Miscellaneous | • Colors: Midnight Blue, Meteor Silver • 2.5D curved glass screen • 95% DCI-P3 coverage • Supports glove touch • ASUS ZenUI 5.0 • 24-bit/192kHz audio • DTS sound (only headphones) | • Colors: Black, White • Asus ZenUI • Hoya camera sensor • Laser autofocus camera (0.03 seconds) • 3x optical zoom camera • Dual tone flash • Fast battery charging: 60% in 40min • Beidou GPS • 5GB Asus Webstorage |
☢️ Radiation rate | ||
| Asus Zenfone 5Z (ZS621KL 256GB) | Asus Zenfone Zoom (ZX551ML 32GB) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | 1.04W/kg (head), 0.37W/kg (body) | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | 1.2W/kg (head), 1.477W/kg (body) | feature not registered |