Compare phones
| Global Score | |
| 82.6 | 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 |
| Aluminum and Glass (Corning Gorilla Glass Victus 2) | Aluminum and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 800.00 | $ 722.00 |
| Display / Screen | |
| 6.2 inches | 6.2 inches |
| 2340 x 1080 pixels | 2400 x 1080 pixels |
| Dynamic AMOLED | Dynamic AMOLED |
| 416 pixels per inch | 424 pixels per inch |
| 2600 cd/m2 brightness | 1300 cd/m2 brightness |
| No touch screen | No touch screen |
| 9.7 | 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 |
| 8 GB RAM | 8 GB RAM |
| Yes GPU | Adreno 660 GPU |
| 6.21 | 9.63 |
| Storage | |
| 128 GB internal memory | 128 GB internal memory |
| No SD card slot | No SD card slot |
| 10.1 | 10.1 |
| Camera | |
| 50.00 MP + 12.00 MP | 12.00 MP + 10.00 MP |
| f/1.80 aperture | f/1.80 aperture |
| 24.00mm focal length | 26.00mm focal length |
| 0.64 inches (1/1.56") 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 |
| 12.54 | 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 | |
| 4000mAh Li - Ion Battery | 4000mAh Li - Polymer Battery |
| Non-Removable Battery | Non-Removable Battery |
| Wireless Charging | Wireless Charging |
| 5.92 | 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 much better than Samsung Galaxy S25, having a score of 91.8 against 82.6. Both of these phones have Android OS, but the Galaxy S21 has older 11 version while Samsung Galaxy S25 has Android 14 version. Galaxy S25 has a little sharper screen than Samsung Galaxy S21, because although it has a quite lower 1080 x 2340 resolution and a just a little less pixels per display inch, and they both have a same size display, the Galaxy S25 also counts with much more display brightness.
The Galaxy S21's memory to install applications and games is just as good as the Galaxy S25 one, both have the same 128 GB internal memory. The Samsung Galaxy S21 features a very superior performance than Galaxy S25. They have the same RAM memory amount and the same number of cores. The Galaxy S25 takes much better videos and photos than Samsung Galaxy S21, and although they both have a same size aperture and the same 7680x4320 video definition, the Galaxy S25 also has a bigger sensor which gives a better photo and video quality, a back-facing camera with a lot higher resolution and higher 30 frames per second video frame rate.
Galaxy S21's battery duration is just as good as the battery duration in Galaxy S25.
Even being the best phone between the ones we are comparing, Galaxy S21 is also cheaper.
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