Google Pixel 9a vs Samsung Galaxy S21 Ultra
76
out 100
VS
67
out 100
Compared 2 smartphones : Google Pixel 9a Manufactured in April, 2025, with display 6.3 with chipsetGoogle Tensor G4, vs Samsung Galaxy S21 Ultra, Manufactured in February, 2021 with chipsetSamsung Exynos 2100. Below are specs, tests, pros and cons for each device
Key Differences
Reasons to choose Google Pixel 9a
- Lighter design: 186g vs 227g
- Higher battery capacity: 5100mAh vs 5000mAh
- Newer Bluetooth version: 5.3 vs 5.2
- Supports DisplayPort
Reasons to choose Samsung Galaxy S21 Ultra
- Larger display: 6.8in
- Higher pixel density: 515ppi
- Supports Dolby Atmos
Versions
| Memory Options | - 8/128 GB - 8/256 GB |
- 12/128 GB - 12/256 GB - 12/512 GB - 16/256 GB - 16/512 GB |
Review
Display
Color accuracy, sharpness & brightness
Camera
Main & front camera tests
Performance
App & system performance
Games
3D gaming performance
Battery
Battery life, charging speed & type
Connectivity
Connectivity features
Adjust each parameter’s importance to find the best match for you.
Tests & specs
Specs & test comparisonDisplay
| Type | POLED | Dynamic AMOLED |
| Size | 6.3 in | 6.8 in |
| Resolution | 1080x2424 pixels | 1440x3200 pixels |
| Aspect ratio | 20:9 | 20:9 |
| Pixel density | 422 ppi | 515 ppi |
| Refresh rate | 120 Hz | 120 Hz |
| Adaptive refresh rate | Yes (60-120 Hz) | Yes (10-120 Hz) |
| Max brightness | 2700 nits | 1500 nits |
| HDR support | Yes HDR10+ | Yes HDR10+ |
| Screen-to-body ratio | 84.5 % | 89.5 % |
| Features | - DCI-P3 - Always-On Display |
- DCI-P3 - Always-On Display |
Design & Build
| Height | 154.7 mm (6.09 in) | 165.1 mm (6.5 in) |
| Width | 73.3 mm (2.89 in) | 75.6 mm (2.98 in) |
| Thickness | 8.9 mm (0.35 in) | 8.9 mm (0.35 in) |
| Weight | 186 g (6.56 oz) | 227 g (8.01 oz) |
| Water resistance | IP68 | IP68 |
| Back panel | Plastic | Glass |
| Frame | Metal | Metal |
| Colors | - White - Black - Red - Purple |
- Black - Silver - Gray - Blue |
| Fingerprint sensor | Yes In-Display | Yes In-Display |
Screen-to-body ratio
Performance
| Chipset | Google Tensor G4 | Samsung Exynos 2100 |
| Max Frequency | 3100 MHz | 2900 MHz |
| CPU Cores | 8 (1 + 3 + 4) | 8 (1 + 3 + 4) |
| Architecture | - 4/1.92 (Cortex-A520) - 3/2.6 (Cortex-A720) - 1/3.1 (Cortex-X4) |
- 4/2.2 (Cortex-A55) - 3/2.81 (Cortex-A78) - 1/2.91 (Cortex-X1) |
| Process | Samsung | Samsung |
| Transistor Size | 4 nm | 5 nm |
| Neural Processor | Yes | Yes |
| Graphics | Mali-G715 MP7 | Mali-G78 MP14 |
| GPU Cores | 896 | 896 |
| GPU Frequency | 940 MHz | 854 MHz |
| FLOPS | 1792 GFLOPS | 1530.4 GFLOPS |
| Geekbench 6 (Single-Core) | 1677 | 1449 |
| Geekbench 6 (Multi-Core) | 4067 | 3892 |
| Geekbench Compute (GPU) | 7784 | n/a |
| CPU | 161737 | 232358 |
| GPU | 464865 | 256356 |
| Memory | 191750 | 163007 |
| UX | 172727 | 191217 |
| NanoReview Score | 991079 | 843008 |
| Max Surface Temp. | n/a | 40.8 °C |
| Stability | n/a | 69 % |
| Graphics Test | n/a | 31 fps |
| Graphics Score | n/a | 5221 |
Memory
| RAM Size | 8 GB | - 12 GB - 16 GB |
| Memory Type | LPDDR5X | LPDDR5 |
| Memory Frequency | 4200 MHz | 2750 MHz |
| Channels | 4 | 2 |
| Storage Capacity | - 128 GB - 256 GB | - 128 GB - 256 GB - 512 GB |
| Storage Type | UFS 3.1 | UFS 3.1 |
| Memory Card | No | No |
Software
| OS | Android 15 | Android 11 (Upgradeable to Android 14) |
| OS Size | n/a | 26.4 GB |
| UI Skin | Stock Android | One UI 6 |
Battery
| Volume | 5100 mAh | 5000 mAh |
| Max Charging Power | 23 W | 25 W |
| Battery Type | Li-Po | Li-ion |
| Removable | No | No |
| Wireless Charging | Yes (7.5 W) | Yes (15 W) |
| Reverse Charging | n/a | Yes (Wireless) |
| Fast Charging | Yes (50% in 30 min) | Yes (54% in 30 min) |
| Full Charge Time | n/a | 1:11 h |
| Web Browsing | n/a | 07:58 h |
| Video Playback | n/a | 13:59 h |
| Games | n/a | 05:14 h |
| Standby Mode | n/a | 111 h |
Main camera
| Matrix | 48 MP | 108 MP |
| Photo resolution | 8000x6000 pixels | 12000x9000 pixels |
| Zoom | Digital | Optical, 10x |
| Flash | Dual LED | Dual LED |
| Stabilization | Optical | Optical |
| 8K Recording | No | Up to 24FPS |
| 4K Recording | Yes (Up to 60 fps) | Yes (Up to 60 fps) |
| 1080p Recording | Yes (Up to 60 fps) | Yes (Up to 60 fps) |
| Slow Motion | 240 fps (1080p) | 960 fps (720p) |
| Wide-angle lens | 120 ° | 120 ° |
| Lenses count | Standard: 50 MP Ultra-wide: 13 MP |
Standard: 108 MP Telephoto: 10 MP Telephoto: 10 MP Ultra-wide: 12 MP |
| Features | - Bokeh effect - Pro mode - RAW support |
- Bokeh effect - Pro mode - RAW support |
| Matrix | 50 MP | 108 MP |
| Aperture | f/1.7 | f/1.8 |
| Focal length | 25 mm | 26 mm |
| Sensor | n/a | Samsung S5KHM3 |
| Sensor size | 1/1.2 | 1/1.33 |
| Pixel size | 0.8 μm | 0.8 μm |
| Autofocus | Phase autofocus (Dual Pixel) | Laser autofocus |
| Stabilization | Optical | Optical |
| Matrix | n/a | 10 MP |
| Aperture | n/a | f/4.9 |
| Focal length | n/a | 240 mm |
| Sensor | n/a | Samsung S5K3J1 |
| Sensor size | n/a | 1/2.65 |
| Pixel size | n/a | 1.22 μm |
| Stabilization | n/a | Optical |
| Matrix | 13 MP | 12 MP |
| Aperture | f/2.2 | f/2.2 |
| Focal length | n/a | 13 mm |
| Sensor | n/a | Sony IMX563 |
| Sensor size | 1/3.1 | 1/2.55 |
| Pixel size | n/a | 1.4 μm |
| Stabilization | Digital | Digital |
| Bokeh | n/a | 70 |
| Preview | n/a | 67 |
| Zoom | n/a | 106 |
Front camera
| Matrix | 13 MP | 40 MP |
| Photo resolution | 4032x3024 pixels | 7864x5200 pixels |
| Aperture | f/2.2 | f/2.2 |
| Focal length | 20 mm | 26 mm |
| Sensor | CMOS | Samsung S5KGH1 |
| Sensor size | 1/3.1 | 1/2.65 |
| Pixel size | 1.12 μm | 0.7 μm |
| Autofocus | n/a | Phase autofocus |
| Stabilization | Digital | Digital |
| Video resolution | 2160p (4K) at 30 fps | 2160p (4K) at 60 fps |
| TOF 3D sensor | No | No |
Connectivity
| Wi-Fi version | Wi-Fi 6E (802.11 a/b/g/n/ac/ax) | Wi-Fi 6E (802.11 a/b/g/n/ac/ax) |
| Wi-Fi features | - Dual Band - Wi-Fi MiMO - Wi-Fi Direct - Wi-Fi Hotspot - Wi-Fi Display |
- Dual Band - Wi-Fi MiMO - Wi-Fi Direct - Wi-Fi Hotspot - Wi-Fi Display |
| Bluetooth version | 5.3 | 5.2 |
| Bluetooth features | LE | LE, A2DP |
| USB type | USB Type-C | USB Type-C |
| USB version | 3.2 | 3.2 |
| USB features | - Charging - USB Storage Mode - OTG |
- Charging - USB Storage Mode - USB-Host mode - OTG |
| DisplayPort | Yes | n/a |
| GPS | - GPS - GLONASS - Galileo |
- GPS - GLONASS - Beidou - Galileo |
| NFC* | Yes | Yes |
| Infrared Port | No | No |
| SIM Count* | 1 | 2 |
| SIM Type | Nano | Nano |
| SIM Mode | n/a | Dual SIM Standby |
| eSIM Support * | Yes | Yes |
| Hybrid Slot | No | No |
| 2G Bands | GSM/EDGE: Quad-band (850, 900, 1800, 1900 MHz) | GSM 850, 900, 1800, 1900 MHz |
| 3G Bands | UMTS/HSPA+/HSDPA 1, 2, 4, 5, 6, 8, 19 | WCDMA Band 1, 2, 4, 5, 8 |
| LTE Bands* | LTE (B1/B2/B3/B4/B5/B7/B8/B12/B13/B14/B17/B20/B25/B26/B28/B29/B30/B38/B41/B48/B66/B71) | LTE (B1/B2/B3/B4/B5/B7/B8/B12/B13/B17/B18/B19/B20/B25/B26/B28/B32/B38/B39/B40/B41/B66) |
| LTE category | n/a | 24 |
| 5G Support | Yes | Yes |
Sound
| Speakers | Stereo | Stereo |
| 3.5 mm Jack | No | No |
| FM Radio | No | No |
| Dolby Atmos | No | Yes |
Other
| Class | Mid-range | Flagship |
| Announced | March, 2025 yr | January, 2021 yr |
| Release Date | April, 2025 yr | February, 2021 yr |
| Launch Price ($) | 499 | 1200 |
| Sensors | - Proximity Sensor - Gyroscope - Accelerometer - Ambient Light Sensor - Compass - Fingerprint sensor |
- Hall Sensor - Barometer - Proximity Sensor - Gyroscope - Accelerometer - Ambient Light Sensor - Compass - Fingerprint sensor |
| Charger Included | No | n/a |
*
Attention!
Config, frequencies, NFC, and other specs may vary by region.
Results
No clear favorite identified yet; updates may follow as new data arrives.
Survey
Total Votes: 0
