Samsung Galaxy S21 Ultra (SM-G998U1 256GB) vs OnePlus 6 (256GB)
Side by side comparison between Samsung Galaxy S21 Ultra vs OnePlus 6 phones, differences, pros, cons and full specifications. What's the better?
,
6.8"
AMOLED
AMOLED
1440x3200
108
MP
MP
40mp
12GB
RAM
RAM
Octa-core
5000
mAh
mAh
(Non removable)
vs
6.28"
AMOLED
AMOLED
1080x2280
16
MP
MP
16mp
8GB
RAM
RAM
Octa-core
3300
mAh
mAh
(Non removable)
What's the better phone? Samsung Galaxy S21 Ultra (SM-G998U1 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 
6 Advantages | 21 Common items in both devices |
| Aluminum frame, glass front/back |
| Dynamic AMOLED / Optic AMOLED |
| 16 million |
| PDAF: phase detection autofocus on both cameras / PDAF: phase detection autofocus |
| OIS: Optical stabilization |
| HDR photo/video on both cameras |
| Capacitive |
| +14 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 | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| Model | Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) |
| Other model names | Galaxy S21 Ultra 5G (SM-G998U1) Unlocked | OnePlus 6 A6000, OnePlus 6 A6003, One Plus 6 (8GB RAM) |
| Country or region available |  USA |  (Global, International) |
| Brand | Samsung | OnePlus |
| Release date | 1/29/2021, Announced: 1/14/2021 | 5/22/2018 |
| Depth | 8.9 millimeters (0.35 inches) | 7.8 millimeters (0.31 inches) |
| Size (width x height) | 75.6 x 165.1 millimeters (2.98 x 6.5 in) | 75.4 x 155.7 millimeters (2.97 x 6.13 in) |
| Weight | 227 grams (7.95 ounces) | 177 grams (6.2 ounces) |
| Build, materials | Aluminum frame, glass front/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 | Not supported |
📲 Display | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| Display type | Dynamic AMOLED | Optic AMOLED |
| Screen size | 6.8" inches | 6.28" inches |
| Screen-to-body ratio | ~89.4% (screen-to-body ratio) | ~83.8% (screen-to-body ratio) |
| Display resolution | 1440x3200 pixels (20:9) | 1080x2280 pixels |
| Touchscreen | Capacitive Multitouch 10-points | Capacitive Multitouch 10-points |
| Pixel density (dot pitch) | 516 PPI | 402 PPI |
| Colors | 16 million | 16 million |
| Scratch-resistant glass | Gorilla Glass Victus | Gorilla Glass 5 |
| Refresh rate | 120Hz | feature not registered |
| Display features | 1500nits[peak] HDR10+ Always-On Display | feature not registered |
🤖 Operating System | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| System version | Android 11 | Android 8.1 Oreo |
| Firmware update | Android 14 | Android 10 |
| User Interface | One UI 3.1 / 4.1 / 5.1 / 6.0 | feature not registered |
⚙️ Processor | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| Chipset | 64bit: Qualcomm Snapdragon 888 (SM8350) (5nm) | 64bit: Qualcomm Snapdragon 845 MSM8998 (10nm) |
| CPU | 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) | Octa-core, 2 processors: 4x 2.8GHz Kryo 385 Gold (Quad-core) 4x 1.7GHz Kryo 385 Silver (Quad-core) |
| GPU graphical controller | Qualcomm Adreno 660 (840MHz) | Qualcomm Adreno 630 |
| Performance (benchmark) | AnTuTu: 681099 (v8), 809165 (v9) Geekbench: 3539 (v5.2) GFXBench: 54fps (ES 3.1 onscreen) | feature not registered |
💽 Memory and storage | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| RAM memory | 12GB LPDDR5 | 8GB LPDDR4X |
| Internal storage | 256GB (220GB available) UFS 3.1 | 256GB (243GB available) |
| External storage | Not supported | Not supported |
📶 Mobile networks | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| Dual-SIM | Dual-SIM Standby - Call active on one sim card | Dual-SIM Standby - Call active on one sim card |
| SIM card | 1 slot (Single-SIM) nano-SIM (4FF) + e-SIM | 2 slots (Dual-SIM) nano-SIM (4FF) |
| Maximum Download / Upload | 5000/1920 Mbps | 1024/150 Mbps |
| Network technology | 2G, 3G, 4G, 5G | 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 | CDMA 800/1900, GSM 850/900/1800/1900 | CDMA 800/1900, GSM 850/900/1800/1900 |
| Primary 3G network | CDMA2000 1xEV-DO UMTS 850/900/1700/1900/2100 | CDMA2000 1xEV-DO TD-SCDMA 1900/2000 UMTS 800/850/900/1700/1900/2100 |
| Primary 4G network | 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 | LTE Cat16 A6000 version (India, Asia, China): LTE (Bands 1,2,3,4,5,7,8,12,17,18,19,20,25,26,28,29,66) TD-LTE (Bands 34,38,39,40,41) A6003 version (Europe, North America): LTE (Bands 1,2,3,4,5,7,8,12,17,18,19,20,25,26,28,29,30,32,66,71) TD-LTE (Bands 34,38,39,40,41) |
| Primary 5G network | SA/NSA/Sub6 (2, 5, 25, 41, 66, 71) mmWave (260, 261) | Not supported |
| Primary data network | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA, Sub6 | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, TD-SCDMA, UMTS, TD-HSDPA, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A |
| Secondary 2G network | CDMA 800/1900, GSM 850/900/1800/1900 | GSM 850/900/1800/1900 |
| Secondary 3G network | CDMA2000 1xEV-DO UMTS 850/900/1700/1900/2100 | Not supported |
| Secondary 4G network | 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 | Not supported |
| Secondary data network | GPRS, EDGE, CDMA2000 EV-DO Rev 0, CDMA2000 EV-DO Rev A, UMTS, HSDPA, HSUPA, HSPA+, TD-LTE, LTE, LTE-A, SA/NSA, Sub6 | GPRS, EDGE |
📷 Camera | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| Back camera (main camera) | (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 | (dual camera) 16 megapixels 20MP wide f/1.71/2.8"25mm1.0µmPDAF |
| Main camera resolution | 12000x9000 pixels | 4608x3456 pixels |
| Video recording (primary) | 8K UHD (7680x4320) 24 fps | 4K UHD (3840x2160) 30 fps |
| Flash | LED flash | Dual-LED flash |
| Focal aperture | f/1.8 (aperture) | f/1.7 (aperture) |
| Focal length | 26mm lens | 27mm lens |
| Sensor size | 1/1.33" inches | 1/2.6" inches |
| Pixel size | 1.8µm pixel | 1.22µm pixel |
| Autofocus | PDAF: phase detection autofocus on both cameras | PDAF: phase detection autofocus |
| Touch focus | Supported | Supported |
| Image stabilization | OIS: Optical stabilization | OIS: Optical stabilization |
| Zoom | Digital and optical zoom | Only digital 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@60fps 1080p@240fps 720p@960fps | feature not registered |
📸 Front camera | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| Front camera (secondary) | 40 megapixels | 16 megapixels |
| Front camera resolution | 7296x5472 pixels | 4608x3456 pixels |
| Video recording (secondary) | 4K UHD (3840x2160) | Full HD (1920x1080) |
| Front flash | Not supported | Not supported |
| Focal aperture | f/2.2 (aperture) | f/2.0 (aperture) |
| Focal length | 26mm lens | 20mm lens |
| Sensor size | 1/2.8" inches | 1/3" inches |
| Pixel size | 0.7µm pixel | 1µm pixel |
🔉 Sound and multimedia | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| Loudspeaker | Stereo sound 32-bit/384kHz Dolby Atmos Tuned by AKG | Supported |
| Active noise cancellation | 2 microphones or more | 2 microphones or more |
| Radio | FM | Not supported |
| TV | Not supported | Not supported |
| Video formats | MP4, H.265, H.264, H.263, XviD, MKV | MP4, H.265, H.264, H.263, DivX, WMV |
| Audio formats | MP3, WAV, WMA, eAAC+, FLAC | MP3, OGG, eAAC+, FLAC |
🔌 Connectivity | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| USB | USB 3.2 Type-C, USB OTG On-The-Go | USB 2.0 Type-C reversible connector |
| Audio output | Type-C reversible connector | 3.5mm jack |
| TV output | USB Type-C (reversible) | Not supported |
| Bluetooth | 5.2 + A2DP/LE | 5.0 + A2DP/LE |
| WiFi | 802.11 a/b/g/n/ac/ax [wifi6] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot | 802.11 a/b/g/n/ac [wifi5] (2.4GHz, 5GHz) + MIMO WiFi Direct, hotspot |
| DLNA | Supported | Supported |
| GPS | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou | A-GPS, GeoTagging, GLONASS, GALILEO, BeiDou |
| NFC | Supported | Supported |
| Infrared port | Not supported | Not supported |
🧭 Sensors | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| Sensors | Accelerometer Ambient light sensor Barometer Compass Face unlock Fingerprint sensor (under display) Gesture Gyroscope Hall effect Proximity sensor UWB (Ultra Wideband) | Accelerometer Ambient light sensor Compass Face unlock Fingerprint sensor (rear-mounted) Gyroscope Hall effect Proximity sensor |
| Vibrating alert | Supported | Supported |
🔋 Battery | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| Battery type | LiPo: li-ion polymer (Non removable) | LiPo: li-ion polymer (Non removable) |
| Battery capacity | 5000 mAh | 3300 mAh |
| Charger, watts | 25W Wired fast charging USB Power Delivery 3.0 | 20W (5V/4A) Wired fast charging |
| Inductive / wireless charging | 15W Qi wireless charging (Qi/PMA) 4.5W Reverse wireless charging | feature not registered |
| Talk time autonomy | feature not registered | feature not registered |
| Standby | feature not registered | feature not registered |
➕ Other features | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| 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: Phantom Black, Silver, Titanium, Navy, Brown • Samsung Pay (Visa, MasterCard) • Samsung DeX • Stylus pen support | • Colors: Midnight Black, Mirror Black, Silk White • 2.5D Gorilla Glass 5 • Screen protector pre-applied • Oxygen OS • Dirac HD sound • Dash Charge • Sony IMX 519 back camera • Sony IMX 371 front camera |
☢️ Radiation rate | ||
| Galaxy S21 Ultra (SM-G998U1 256GB) | OnePlus 6 (256GB) | |
| SAR 1.6W/kg (USA, Mexico, etc.) | 0.77W/kg (head), 1.02W/kg (body) | feature not registered |
| SAR 2W/kg (Europe, UK, etc.) | feature not registered | feature not registered |