Compare phones
| Global Score | |
| 90.7 | 91.8 |
| Basic Information | |
| Samsung | Samsung |
| Android 14 | Android 11 |
| -- | 2021-01-29 |
| -- | 5.97 x 2.80 x 0.31 inches |
| -- | 6.03 ounces |
| -- | Gray, Phantom pink, Violet and White |
| Glass (Corning Gorilla Glass) and Titanium | Aluminum and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| -- | $ 722.00 |
| Display / Screen | |
| 6.8 inches | 6.2 inches |
| 3088 x 1440 pixels | 2400 x 1080 pixels |
| Dynamic AMOLED | Dynamic AMOLED |
| 501 pixels per inch | 424 pixels per inch |
| 2600 cd/m2 brightness | 1300 cd/m2 brightness |
| No touch screen | No touch screen |
| 10.2 | 9.2 |
| Performance | |
| Qualcomm Snapdragon 8 Gen 4 chipset | Qualcomm Snapdragon 888 chipset |
| processor | Kryo 680, 64-bit, 5 nm (Octa-Core 2840 MHz) processor |
| 12 GB RAM | 8 GB RAM |
| Yes GPU | Adreno 660 GPU |
| 6.21 | 9.63 |
| Storage | |
| 256 GB internal memory | 128 GB internal memory |
| No SD card slot | No SD card slot |
| 13.3 | 10.1 |
| Camera | |
| 200.00 MP + 12.00 MP | 12.00 MP + 10.00 MP |
| f/1.70 aperture | f/1.80 aperture |
| 24.00mm focal length | 26.00mm focal length |
| 0.77 inches (1/1.3") sensor | 0.57 inches (1/1.76") sensor |
| 7680 x 4320 (30 fps) video resolution | 7680 x 4320 (24 fps) video resolution |
| 1920 x 1080 (240 fps) (Full HD) slow motion video | 1280 x 720 (960 fps) (HD) slow motion video |
| 14.74 | 10.78 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G) and HSDPA | 5G, 5G, LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Nano SIM | Nano SIM |
| 10.6 | 10.7 |
| Battery Life | |
| 5000mAh Li - Ion Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | Wireless Charging |
| 6.8 | 5.92 |
| Other Features | |
| Bluetooth 5.3 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | NFC |
| Fingerprint ID Scanner | Fingerprint ID Scanner |
| Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| -- | FM Radio |
Comparison review
Galaxy S21 is slightly better than the Galaxy S25 Ultra, having a 91.8 score against 90.7. These devices come with Android OS, but the Galaxy S21 has an older 11 version and Galaxy S25 Ultra has Android 14 version. The Galaxy S25 Ultra has a sharper display than Samsung Galaxy S21, because it has a quite better pixels quantity per inch of display, a better 1440 x 3088 resolution, a really brighter display and a little bigger display.
The Samsung Galaxy S25 Ultra counts with a much greater memory for games and applications than Galaxy S21, because it has 256 GB internal storage capacity. Galaxy S21 has a very superior processing power than Samsung Galaxy S25 Ultra, although it has 4 GB less RAM, they both have the same number of cores.
The Galaxy S25 Ultra counts with better battery life than Samsung Galaxy S21, because it has a 25% larger battery capacity. The Galaxy S25 Ultra shoots way better videos and photos than Galaxy S21, and although they both have the same video quality, the Galaxy S25 Ultra also has a bigger aperture to capture better photography and video in poorly lited situations, a much bigger sensor providing a way better image quality, a back camera with much more MP and better 30 frames per second video frame rates.
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