Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) vs Samsung Galaxy S21 Ultra (SM-G998B/DS 512GB)
Side by side comparison between Asus Zenfone 3 Max vs Samsung Galaxy S21 Ultra phones, differences, pros, cons and full specifications. What's the better?
,
5.5"
IPS
IPS
1080x1920
16
MP
MP
8mp
2GB
RAM
RAM
Octa-core
4100
mAh
mAh
(Non removable)
vs
6.8"
AMOLED
AMOLED
1440x3200
108
MP
MP
40mp
16GB
RAM
RAM
Octa-core
5000
mAh
mAh
(Non removable)
What's the better phone? Samsung Galaxy S21 Ultra (SM-G998B/DS 512GB)
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!
5 Advantages 
31 Advantages | 16 Common items in both devices |
| 16 million |
| LDAF/PDAF: laser/phase detection autofocus / PDAF: phase detection autofocus on both cameras |
| HDR photo on both cameras / HDR photo/video on both cameras |
| Capacitive |
| Multitouch |
| Accelerometer |
| Ambient light sensor |
| +9 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 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Model | Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) |
| Other model names | Asus Zenfone 3 Max ZC553KL 2GB/32GB 5.5" Dual-Sim | Galaxy S21 Ultra 5G (SM-G998B/Dual-SIM) |
| Country or region available |         (Global, International), Brazil, (Europe), Philippines, India, Indonesia, Japan, Taiwan | (Global, International) |
| Brand | Asus | Samsung |
| Release date | 9/1/2016 | 1/29/2021, Announced: 1/14/2021 |
| Depth | 8.3 millimeters (0.33 inches) | 8.9 millimeters (0.35 inches) |
| Size (width x height) | 76.24 x 151.4 millimeters (3 x 5.96 in) | 75.6 x 165.1 millimeters (2.98 x 6.5 in) |
| Weight | 175 grams (6.13 ounces) | 227 grams (7.95 ounces) |
| Build, materials | feature not registered | Aluminum frame, glass front/back |
| Protection against water and others | Not supported | IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant |
📲 Display | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Display type | TFT IPS LCD | Dynamic AMOLED |
| Screen size | 5.5" inches | 6.8" inches |
| Screen-to-body ratio | ~72.2% (screen-to-body ratio) | ~89.4% (screen-to-body ratio) |
| Display resolution | 1080x1920 pixels | 1440x3200 pixels (20:9) |
| Touchscreen | Capacitive Multitouch 10-points | Capacitive Multitouch 10-points |
| Pixel density (dot pitch) | 401 PPI | 516 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass 3 | Gorilla Glass Victus |
| Refresh rate | feature not registered | 120Hz |
| Display features | feature not registered | 1500nits[peak] HDR10+ Always-On Display |
🤖 Operating System | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| System version | Android 6.0.1 Marshmallow | Android 11 |
| Firmware update | Android 8.1 Oreo | Android 14 |
| User Interface | feature not registered | One UI 3.1 / 4.1 / 5.1 / 6.0 |
⚙️ Processor | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Chipset | 64bit: Qualcomm Snapdragon 430 MSM8937 (28nm) | 64bit: Samsung Exynos 2100 (5nm) |
| CPU | Octa-core, 2 processors: 4x 1.4GHz ARM Cortex-A53 (Quad-core) 4x 1.1GHz ARM Cortex-A53 (Quad-core) | Octa-core, 3 processors: 1x 2.9GHz ARM Cortex-X1 (Single-core) 3x 2.8GHz ARM Cortex-A78 (Triple-core) 4x 2.2GHz ARM Cortex-A55 (Quad-core) |
| GPU graphical controller | Qualcomm Adreno 505 450Mhz | ARM Mali-G78 MP14 (854MHz) |
| Performance (benchmark) | feature not registered | AnTuTu: 657150 (v8), 727634 (v9) Geekbench: 3457 (v5.2) GFXBench: 51fps (ES 3.1 onscreen) |
💽 Memory and storage | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| RAM memory | 2GB LPDDR3 | 16GB LPDDR5 |
| Internal storage | 32GB (24GB available) | 512GB (457GB available) UFS 3.1 |
| External storage | Until 256GB microSD, microSDXC (hybrid slot/shares the same SIM-2 slot) | Not supported |
📶 Mobile networks | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Dual-SIM | Dual-SIM Standby - Call active on one sim card (hybrid slot/shares the same microSD slot) | Dual-SIM Standby - Call active on one sim card |
| SIM card | 2 slots (Dual-SIM) micro-SIM (3FF) and nano-SIM (4FF) | 2 slots (Dual-SIM) nano-SIM (4FF) + e-SIM |
| Maximum Download / Upload | 150/50 Mbps | 5000/1920 Mbps |
| Network technology | 2G, 3G, 4G | 2G, 3G, 4G, 5G |
| 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 | Global version: UMTS 850/900/1900/2100 Taiwan/Japan: UMTS 800/850/900/1900/2100 India/Indonesia: UMTS 850/900/2100 | UMTS 850/900/1700/1900/2100 |
| Primary 4G network | LTE Cat4 Global version: LTE 800/850/900/1800/1900/2100/2600 (Bands 1,2,3,5,7,8,20) Taiwan/Japan: LTE 700/800/850/900/1800/1900/2100/2600 (Bands 1,2,3,5,6,7,8,18,19,26,28) TD-LTE 2500/2600 (Bands 38,41) India/Indonesia: LTE 850/900/1800/2100 (Bands 1,3,5,8) TD-LTE 2300 (Band 40) | LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66) TD-LTE (38, 39, 40, 41) VoLTE |
| Primary 5G network | Not supported | SA/NSA/Sub6 (1, 3, 5, 7, 8, 20, 28, 38, 40, 41, 66, 77, 78) |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA |
| Secondary 2G network | GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Secondary 3G network | Not supported | UMTS 850/900/1700/1900/2100 |
| Secondary 4G network | Not supported | LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28, 32, 66) TD-LTE (38, 39, 40, 41) VoLTE |
| Secondary data network | GPRS, EDGE | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA |
📷 Camera | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Back camera (main camera) | 16 megapixels | (quad camera) 108 megapixels 10MP periscope telephoto f/4.9240mm1/3.24"1.22µmPDAFOIS10x-optical-zoom 10MP telephoto f/2.470mm1/3.24"1.22µmPDAFOIS3x-optical-zoom 12MP ultrawide f/2.213mm1/2.55"1.4µmPDAFSuper-Steady-video |
| Main camera resolution | 4608x3456 pixels | 12000x9000 pixels |
| Video recording (primary) | Full HD (1920x1080) 30 fps | 8K UHD (7680x4320) 24 fps |
| Flash | Dual-LED flash | LED flash |
| Focal aperture | f/2.0 (aperture) | f/1.8 (aperture) |
| Focal length | feature not registered | 26mm lens |
| Sensor size | 1/3" inches | 1/1.33" inches |
| Pixel size | feature not registered | 1.8µm pixel |
| Autofocus | LDAF/PDAF: laser/phase detection autofocus | PDAF: phase detection autofocus on both cameras |
| Touch focus | Supported | Supported |
| Image stabilization | EIS: Digital 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 | Supported |
| HDR | HDR photo on both cameras | HDR photo/video on both cameras |
| Camera extras | feature not registered | 4K@60fps 1080p@240fps 720p@960fps |
📸 Front camera | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Front camera (secondary) | 8 megapixels | 40 megapixels |
| Front camera resolution | 3264x2448 pixels | 7296x5472 pixels |
| Video recording (secondary) | HD (1280x720) | 4K UHD (3840x2160) |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.2 (aperture) | f/2.2 (aperture) |
| Focal length | feature not registered | 26mm lens |
| Sensor size | feature not registered | 1/2.8" inches |
| Pixel size | feature not registered | 0.7µm pixel |
🔉 Sound and multimedia | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Loudspeaker | Supported | Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG |
| Active noise cancellation | 2 microphones or more | 2 microphones or more |
| Radio | FM (RDS) | FM |
| TV | Not supported | Not supported |
| Video formats | MP4, H.264, H.263 | MP4, H.265, H.264, H.263, XviD, MKV |
| Audio formats | MP3, WAV, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| USB | MicroUSB 2.0 | USB 3.2 Type-C, USB OTG On-The-Go |
| Audio output | 3.5mm jack | Type-C reversible connector |
| TV output | Not supported | USB Type-C (reversible) |
| Bluetooth | 4.1 + A2DP | 5.2 + A2DP/LE |
| WiFi | 802.11 b/g/n [wifi4] (2.4GHz) WiFi Direct, hotspot | 802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot |
| DLNA | Not supported | Supported |
| GPS | A-GPS, GeoTagging, GLONASS, BeiDou | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou |
| NFC | Not supported | Supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Sensors | Accelerometer Ambient light sensor Compass Fingerprint sensor Gyroscope Hall effect Proximity sensor | Accelerometer Ambient light sensor Barometer Compass Face unlock Fingerprint sensor (under display) Gesture Gyroscope Hall effect Proximity sensor UWB (Ultra Wideband) |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Battery type | LiPo: li-ion polymer (Non removable) | LiPo: li-ion polymer (Non removable) |
| Battery capacity | 4100 mAh | 5000 mAh |
| Charger, watts | 10W (5V/2A) Wired charging | 25W Wired fast charging USB Power Delivery 3.0 |
| Inductive / wireless charging | feature not registered | 15W Qi wireless charging (Qi/PMA) 4.5W Reverse wireless charging |
| Talk time autonomy | 17 hours | feature not registered |
| Standby | 912 hours (38 days) | feature not registered |
➕ Other features | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| Call control | Voice dialing, Voice recorder | Voice dialing, Voice recorder, Voice commands |
| 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: Titanium Grey, Glacier Silver, Pink, Gold • USB OTG On-The-Go • Asus ZenUI 3.0 • 2.5D glass screen • 450nits brightness screen | • Colors: Phantom Black, Silver, Titanium, Navy, Brown • Samsung Pay (Visa, MasterCard) • Samsung DeX • Stylus pen support |
☢️ Radiation rate | ||
| Asus Zenfone 3 Max (5.5 ZC553KL 2GB RAM) | Galaxy S21 Ultra (SM-G998B/DS 512GB) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | 0.24W/kg (head), 0.72W/kg (body) |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | 0.714W/kg (head), 1.58W/kg (body) |