Compare phones
| Global Score | |
| 90.7 | 98.1 |
| Basic Information | |
| Samsung | Samsung |
| Android 14 | Android 11 |
| -- | 2021-01-29 |
| -- | 6.50 x 2.98 x 0.35 inches |
| -- | 8.04 ounces |
| -- | Phantom black and Silver |
| Glass (Corning Gorilla Glass) and Titanium | Aluminum and Glass (Corning Gorilla Glass Victus) |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| -- | $ 966.00 |
| Display / Screen | |
| 6.8 inches | 6.8 inches |
| 3088 x 1440 pixels | 3200 x 1440 pixels |
| Dynamic AMOLED | Dynamic AMOLED |
| 501 pixels per inch | 516 pixels per inch |
| 2600 cd/m2 brightness | 1500 cd/m2 brightness |
| No touch screen | No touch screen |
| 10.2 | 9.8 |
| 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 | 12 GB RAM |
| Yes GPU | Adreno 660 GPU |
| 6.21 | 9.72 |
| 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 | 108.00 MP + 40.00 MP |
| f/1.70 aperture | f/1.80 aperture |
| 24.00mm focal length | 24.00mm focal length |
| 0.77 inches (1/1.3") sensor | 0.75 inches (1/1.33") 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 | 13.75 |
| 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 | 5000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | Wireless Charging |
| 6.8 | 6.8 |
| Other Features | |
| Bluetooth 5.3 | Bluetooth 5.1 |
| 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 Ultra has a score of 98.1, which is a bit better than Samsung Galaxy S25 Ultra's overall score of 90.7. These phones use Android OS, but Galaxy S21 Ultra has the older 11 version and Samsung Galaxy S25 Ultra has Android 14. The Galaxy S21 Ultra features a much greater performance than Galaxy S25 Ultra. Both have 12 GB of RAM and the same number of cores.
The Samsung Galaxy S25 Ultra has a slightly better screen than Galaxy S21 Ultra, because although it has a bit lower resolution of 1440 x 3088 pixels and a just a bit worse pixel quantity per inch in the display, and they both have a display of the same size, the Samsung Galaxy S25 Ultra also counts with way more brightness.
The Galaxy S25 Ultra counts with much more storage capacity to install applications and games than Samsung Galaxy S21 Ultra, because it has 128 GB more internal memory capacity. The Galaxy S21 Ultra's battery duration is very similar to the Samsung Galaxy S25 Ultra one. Galaxy S25 Ultra shoots a bit better videos and photos than Galaxy S21 Ultra, and although they both have the same video resolution, the Galaxy S25 Ultra also has a lot more mega pixels back-facing camera, a larger back camera sensor shooting better quality photos and videos, a bigger camera aperture to take better low-light photos and faster 30 fps video frame rate.
Disclaimer: As an Amazon Associate I earn from qualifying purchases.