Asus Zenfone 9 (128GB/6GB) vs Samsung Galaxy S21 Ultra (SM-G998U1 128GB)
Side by side comparison between Asus Zenfone 9 vs Samsung Galaxy S21 Ultra phones, differences, pros, cons and full specifications. What's the better?
,
5.9"
AMOLED
AMOLED
1080x2400
50
MP
MP
12mp
6GB
RAM
RAM
Octa-core
4300
mAh
mAh
(Non removable)
vs
6.8"
AMOLED
AMOLED
1440x3200
108
MP
MP
40mp
12GB
RAM
RAM
Octa-core
5000
mAh
mAh
(Non removable)
What's the better phone? Samsung Galaxy S21 Ultra (SM-G998U1 128GB)
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 
19 Advantages | 32 Common items in both devices |
| 128GB (104GB available) / 128GB (101GB available) |
| UFS 3.1 |
| Aluminum body, glass front, plastic back / Aluminum frame, glass front/back |
| Super AMOLED / Dynamic AMOLED |
| HDR10+ |
| 120Hz |
| 16 million |
| +25 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 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Model | Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) |
| Other model names | Zenfone 9z AI2202-1A028BR, AI2202-1A006EU, 90AI00C3-M000X0 | Galaxy S21 Ultra 5G (SM-G998U1) Unlocked |
| Country or region available |  (Global, International) |  USA |
| Brand | Asus | Samsung |
| Release date | 9/15/2022, Announced: 7/28/2022 | 1/29/2021, Announced: 1/14/2021 |
| Depth | 9.1 millimeters (0.36 inches) | 8.9 millimeters (0.35 inches) |
| Size (width x height) | 68.1 x 146.5 millimeters (2.68 x 5.77 in) | 75.6 x 165.1 millimeters (2.98 x 6.5 in) |
| Weight | 169 grams (5.92 ounces) | 227 grams (7.95 ounces) |
| Build, materials | Aluminum body, glass front, plastic back | Aluminum frame, glass front/back |
| Protection against water and others | IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant | IP68 certified: water-resistant up to 1.5 meters for 30min and dust-resistant |
📲 Display | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Display type | Super AMOLED | Dynamic AMOLED |
| Screen size | 5.9" inches | 6.8" inches |
| Screen-to-body ratio | ~84.2% (screen-to-body ratio) | ~89.4% (screen-to-body ratio) |
| Display resolution | 1080x2400 pixels (20:9) | 1440x3200 pixels (20:9) |
| Touchscreen | Capacitive Multitouch 10-points | Capacitive Multitouch 10-points |
| Pixel density (dot pitch) | 446 PPI | 516 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass Victus | Gorilla Glass Victus |
| Refresh rate | 120Hz | 120Hz |
| Display features | 1100nits[peak] HDR10+ Always-On Display | 1500nits[peak] HDR10+ Always-On Display |
🤖 Operating System | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| System version | Android 12 | Android 11 |
| Firmware update | Android 13 | Android 14 |
| User Interface | ZenUI 9 | One UI 3.1 / 4.1 / 5.1 / 6.0 |
⚙️ Processor | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Chipset | 64bit: Qualcomm Snapdragon 8+ Gen 1 (SM8475) (4nm) | 64bit: Qualcomm Snapdragon 888 (SM8350) (5nm) |
| CPU | Octa-core, 3 processors: 1x 3.19GHz ARM Cortex-X2 (Single-core) 3x 2.75GHz ARM Cortex-A710 (Triple-core) 4x 2GHz ARM Cortex-A510 (Quad-core) | Octa-core, 3 processors: 1x 2.84GHz Kryo 680 (Single-core) 3x 2.42GHz Kryo 680 (Triple-core) 4x 1.8GHz Kryo 680 (Quad-core) |
| GPU graphical controller | Qualcomm Adreno 730 (818MHz) | Qualcomm Adreno 660 (840MHz) |
| Performance (benchmark) | AnTuTu: 1083028 (v9) Geekbench: 4338 (v5.1) GFXBench: 89fps (ES 3.1 onscreen) | AnTuTu: 681099 (v8), 809165 (v9) Geekbench: 3539 (v5.2) GFXBench: 54fps (ES 3.1 onscreen) |
💽 Memory and storage | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| RAM memory | 6GB LPDDR5 | 12GB LPDDR5 |
| Internal storage | 128GB (104GB available) UFS 3.1 | 128GB (101GB available) UFS 3.1 |
| External storage | Not supported | Not supported |
📶 Mobile networks | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Dual-SIM | Dual-SIM Standby - Call active on one sim card | Dual-SIM Standby - Call active on one sim card |
| SIM card | 2 slots (Dual-SIM) nano-SIM (4FF) | 1 slot (Single-SIM) nano-SIM (4FF) + e-SIM |
| Maximum Download / Upload | 2000/1024 Mbps | 5000/1920 Mbps |
| Network technology | 2G, 3G, 4G, 5G | 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 | CDMA 800/1900, GSM 850/900/1800/1900 |
| Primary 3G network | UMTS 800/850/900/1700/1900/2100 | CDMA2000 1xEV-DO UMTS 850/900/1700/1900/2100 |
| Primary 4G network | LTE Cat20 VoLTE A version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28) TD-LTE (34, 38, 39, 40, 41, 42) B version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28) TD-LTE (34, 38, 39, 40, 41, 42) C version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 28, 30, 66, 71) TD-LTE (34, 38, 39, 40, 41, 42) | LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 66, 71) TD-LTE (38, 39, 40, 41, 46, 48) VoLTE |
| Primary 5G network | A version: SA/NSA (1, 2, 3, 5, 7, 8, 12, 20, 28, 38, 77, 78) B version: SA/NSA (1, 2, 3, 5, 7, 8, 12, 20, 28, 38, 41, 77, 78) C version: SA/NSA (1, 2, 3, 5, 7, 8, 12, 20, 25, 28, 38, 40, 41, 66, 71, 77, 78) | SA/NSA/Sub6 (2, 5, 25, 41, 66, 71) mmWave (260, 261) |
| Primary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA, Sub6 |
| Secondary 2G network | GSM 850/900/1800/1900 | CDMA 800/1900, GSM 850/900/1800/1900 |
| Secondary 3G network | UMTS 800/850/900/1700/1900/2100 | CDMA2000 1xEV-DO UMTS 850/900/1700/1900/2100 |
| Secondary 4G network | LTE Cat20 VoLTE A version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28) TD-LTE (34, 38, 39, 40, 41, 42) B version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 26, 28) TD-LTE (34, 38, 39, 40, 41, 42) C version: LTE (1, 2, 3, 4, 5, 7, 8, 12, 17, 18, 19, 20, 25, 26, 28, 30, 66, 71) TD-LTE (34, 38, 39, 40, 41, 42) | LTE Cat20 (1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 18, 19, 20, 25, 26, 28, 30, 66, 71) TD-LTE (38, 39, 40, 41, 46, 48) VoLTE |
| Secondary data network | GPRS, EDGE, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA, Sub6 |
📷 Camera | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Back camera (main camera) | (dual camera) 50 megapixels 12MP ultrawide f/2.214.4mm113°1/2.93"1.4µmAF | (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 | 8160x6120 pixels | 12000x9000 pixels |
| Video recording (primary) | 8K UHD (7680x4320) 24 fps | 8K UHD (7680x4320) 24 fps |
| Flash | LED flash | LED flash |
| Focal aperture | f/1.9 (aperture) | f/1.8 (aperture) |
| Focal length | 24mm lens | 26mm lens |
| Sensor size | 1/1.56" inches | 1/1.33" inches |
| Pixel size | 1µm pixel | 1.8µm pixel |
| Autofocus | PDAF: phase detection autofocus | PDAF: phase detection autofocus on both cameras |
| Touch focus | Supported | Supported |
| Image stabilization | OIS: 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 | Supported | Supported |
| HDR | HDR photo/video on both cameras | HDR photo/video on both cameras |
| Camera extras | 4K@30/60/120fps 1080p@30/60/240fps 720p@480fps | 4K@60fps 1080p@240fps 720p@960fps |
📸 Front camera | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Front camera (secondary) | 12 megapixels | 40 megapixels |
| Front camera resolution | 4000x3000 pixels | 7296x5472 pixels |
| Video recording (secondary) | 4K UHD (3840x2160) | 4K UHD (3840x2160) |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.5 (aperture) | f/2.2 (aperture) |
| Focal length | 27mm lens | 26mm lens |
| Sensor size | 1/2.93" inches | 1/2.8" inches |
| Pixel size | 1.22µm pixel | 0.7µm pixel |
🔉 Sound and multimedia | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Loudspeaker | Stereo sound 24-bit/192kHz | Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG |
| Active noise cancellation | 2 microphones or more | 2 microphones or more |
| Radio | Not supported | FM |
| TV | Not supported | Not supported |
| Video formats | MP4, H.265, H.264, H.263, XviD, MKV | MP4, H.265, H.264, H.263, XviD, MKV |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, WAV, WMA, eAAC+, FLAC |
🔌 Connectivity | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| USB | USB 2.0 Type-C, USB OTG On-The-Go | USB 3.2 Type-C, USB OTG On-The-Go |
| Audio output | 3.5mm jack | Type-C reversible connector |
| TV output | USB Type-C (reversible) | USB Type-C (reversible) |
| Bluetooth | 5.2 + A2DP/LE | 5.2 + A2DP/LE |
| WiFi | 802.11 a/b/g/n/ac/ax [wifi6E/6] (2.4GHz, 5GHz, 6GHz) + MIMO WiFi Direct, hotspot | 802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot |
| DLNA | Supported | Supported |
| GPS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou, QZSS, NavIC | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou |
| NFC | Supported | Supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Sensors | Accelerometer Ambient light sensor Compass Face unlock Fingerprint sensor (side-mounted) 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 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Battery type | LiPo: li-ion polymer (Non removable) | LiPo: li-ion polymer (Non removable) |
| Battery capacity | 4300 mAh | 5000 mAh |
| Charger, watts | 30W Wired fast charging 5W Reverse charging by cable Quick Charge 4 USB Power Delivery 3.0 | 25W Wired fast charging USB Power Delivery 3.0 |
| Inductive / wireless charging | Not supported | 15W Qi wireless charging (Qi/PMA) 4.5W Reverse wireless charging |
| Talk time autonomy | feature not registered | feature not registered |
| Standby | feature not registered | feature not registered |
➕ Other features | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| Call control | Voice dialing, Voice recorder, Voice commands | 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: Black, Blue, Red, Silver | • Colors: Phantom Black, Silver, Titanium, Navy, Brown • Samsung Pay (Visa, MasterCard) • Samsung DeX • Stylus pen support |
☢️ Radiation rate | ||
| Asus Zenfone 9 (128GB/6GB) | Galaxy S21 Ultra (SM-G998U1 128GB) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | feature not registered | 0.77W/kg (head), 1.02W/kg (body) |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |