| Global Score | |
| 79 | 84.1 |
| Basic Information | |
| Samsung | Samsung |
| Android 4.4 | Android 11, 10 |
| 2013-03-14 | 2020-03-23 |
| 5.38 x 2.75 x 0.31 inches | 6.26 x 2.96 x 0.35 inches |
| 4.59 ounces | 6.63 ounces |
| Black, Blue, Red and White | Midnight blue and Raven black |
| Polycarbonate | Plastic and Plastic |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| $ 135.00 | -- |
| Display / Screen | |
| 5 inches | 6.4 inches |
| 1080 x 1920 pixels (Full HD) | 2340 x 1080 pixels |
| Super AMOLED | Super AMOLED |
| 441 pixels per inch | 403 pixels per inch |
| -- | 420 cd/m2 brightness |
| Capacitive, Multi-touch | No touch screen |
| 9.1 | 8.4 |
| Performance | |
| Qualcomm Snapdragon 600 APQ8064T chipset | Exynos 9611 chipset |
| Krait 300 (Quad-Core 1900 MHz) processor | Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor |
| 2 GB (800 MHz) RAM | 4 GB RAM |
| Adreno 320 (400 MHz) GPU | Mali-G72 MP3 GPU |
| 9 | 9.27 |
| Storage | |
| 64 GB internal memory | 64 GB internal memory |
| microSD, microSDHC, microSDXC (up to 64 GB) external memory slot | microSDXC (up to 512 GB) external memory slot |
| 9.46 | 11.74 |
| Camera | |
| 13.00 MP + 2.00 MP | 48.00 MP + 20.00 MP |
| f/2.20 aperture | f/2.00 aperture |
| 31.00mm focal length | 26.00mm focal length |
| 0.33 inches (1/3.06") sensor | 0.5 inches (1/2") sensor |
| 1920 x 1080 (30 fps) (Full HD) video resolution | 3840 x 2160 (30 fps) (4K) video resolution |
| -- | 1920 x 1080 (240 fps) (Full HD) slow motion video |
| 9.02 | 11.55 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE (4G), HSPA+ (4G), HSDPA, HSUPA, UMTS, EDGE, GPRS and GSM | LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA |
| Micro SIM | Nano SIM, Dual SIM |
| 7 | 6.7 |
| Battery Life | |
| 2600mAh Li-Ion Battery | 6000mAh Li - Polymer Battery |
| Removable Battery | Non-Removable Battery |
| Wireless Charging | -- |
| 17 hours talk time | -- |
| 4.56 | 7.52 |
| Other Features | |
| Bluetooth 4.0 | Bluetooth 5.0 |
| GPS | GPS |
| NFC | -- |
| Infra-red port | -- |
| -- | Fingerprint ID Scanner |
| Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor | Accelerometer, Gyroscope and Proximity Sensor |
| -- | FM Radio |
The Galaxy M21 is slightly better than the Galaxy S4, with an 84.1 score against 79. These phones use Android OS (Operating System), but the Galaxy M21 has a newer 11 version while Galaxy S4 has Android 4.4 version. The Galaxy M21 construction is a lot newer than the Galaxy S4's, although it is extremely heavier and thicker.
Galaxy S4 counts with a bit sharper screen than Galaxy M21, because although it has a little bit worse resolution of 1920 x 1080 and a lot smaller screen, it also counts with a just a little higher pixels density. Samsung Galaxy M21 has a bit superior processing unit than Samsung Galaxy S4, because although it has doesn't have a graphics processing unit, it also counts with 2 GB more RAM and a greater number of faster cores.
The Galaxy M21 has a superior storage capacity to install applications and games than Samsung Galaxy S4, and although they both have the same internal memory, the Galaxy M21 also has a SD memory card expansion slot that supports a maximum of 512 GB. The Samsung Galaxy M21 shoots much clearer photos and videos than Galaxy S4, because it has a way higher 3840x2160 (4K) video resolution, a bigger aperture to capture better low light photography, a back camera with a way better resolution and a way bigger back-facing camera sensor.
Samsung Galaxy M21 features a superior battery duration than Samsung Galaxy S4, because it has a 131 percent bigger battery capacity.
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