| Global Score | |
| 84.1 | 79 |
| Basic Information | |
| Samsung | Samsung |
| Android 11, 10 | Android 4.4 |
| 2020-03-23 | 2013-03-14 |
| 6.26 x 2.96 x 0.35 inches | 5.38 x 2.75 x 0.31 inches |
| 6.63 ounces | 4.59 ounces |
| Midnight blue and Raven black | Black, Blue, Red and White |
| Plastic and Plastic | Polycarbonate |
| Scratch-Resistant Glass | Scratch-Resistant Glass |
| -- | $ 135.00 |
| Display / Screen | |
| 6.4 inches | 5 inches |
| 2340 x 1080 pixels | 1080 x 1920 pixels (Full HD) |
| Super AMOLED | Super AMOLED |
| 403 pixels per inch | 441 pixels per inch |
| 420 cd/m2 brightness | -- |
| No touch screen | Capacitive, Multi-touch |
| 8.4 | 9.1 |
| Performance | |
| Exynos 9611 chipset | Qualcomm Snapdragon 600 APQ8064T chipset |
| Arm Cortex-A73 and Arm Cortex-A53, 64-bit, 10 nm (Octa-Core 2300 MHz) processor | Krait 300 (Quad-Core 1900 MHz) processor |
| 4 GB RAM | 2 GB (800 MHz) RAM |
| Mali-G72 MP3 GPU | Adreno 320 (400 MHz) GPU |
| 9.27 | 9 |
| Storage | |
| 64 GB internal memory | 64 GB internal memory |
| microSDXC (up to 512 GB) external memory slot | microSD, microSDHC, microSDXC (up to 64 GB) external memory slot |
| 11.74 | 9.46 |
| Camera | |
| 48.00 MP + 20.00 MP | 13.00 MP + 2.00 MP |
| f/2.00 aperture | f/2.20 aperture |
| 26.00mm focal length | 31.00mm focal length |
| 0.5 inches (1/2") sensor | 0.33 inches (1/3.06") sensor |
| 3840 x 2160 (30 fps) (4K) video resolution | 1920 x 1080 (30 fps) (Full HD) video resolution |
| 1920 x 1080 (240 fps) (Full HD) slow motion video | -- |
| 11.55 | 9.02 |
| Networks | |
| Wi-Fi | Wi-Fi |
| Mobile Hotspot | Mobile Hotspot |
| LTE-A (4G), LTE (4G), HSPA+ (4G), HSDPA and HSUPA | LTE (4G), HSPA+ (4G), HSDPA, HSUPA, UMTS, EDGE, GPRS and GSM |
| Nano SIM, Dual SIM | Micro SIM |
| 6.7 | 7 |
| Battery Life | |
| 6000mAh Li - Polymer Battery | 2600mAh Li-Ion Battery |
| Non-Removable Battery | Removable Battery |
| -- | Wireless Charging |
| -- | 17 hours talk time |
| 7.52 | 4.56 |
| Other Features | |
| Bluetooth 5.0 | Bluetooth 4.0 |
| GPS | GPS |
| -- | NFC |
| -- | Infra-red port |
| Fingerprint ID Scanner | -- |
| Accelerometer, Gyroscope and Proximity Sensor | Accelerometer, Barometer, Compass, Gyroscope, Light Sensor and Proximity Sensor |
| FM Radio | -- |
Galaxy M21 is a bit better than Galaxy S4, having a score of 84.1 against 79. These devices use Android OS (Operating System), but Galaxy M21 has newer 11 version while Galaxy S4 has Android 4.4. The Galaxy M21 construction is way newer than Galaxy S4's, although it's somewhat thicker and a lot heavier.
Galaxy M21 has a little better performance than Samsung Galaxy S4, because although it has doesn't have an extra graphics processing unit, it also counts with a larger number of cores (and faster) and more RAM memory. Samsung Galaxy S4 has just a bit better looking display than Samsung Galaxy M21, because although it has a bit worse resolution of 1920 x 1080px and a way smaller screen, it also counts with a little bit better pixel number per inch in the screen.
Galaxy M21 has a much greater memory for applications, games, photos and videos than Samsung Galaxy S4, and although they both have equal 64 GB internal storage capacity, the Galaxy M21 also has a slot for an SD memory card that allows up to 512 GB. Samsung Galaxy M21 captures much clearer pictures and videos than Samsung Galaxy S4, because it has a lot better 48 mega-pixels resolution camera, a lot bigger back-facing camera sensor taking more light and vivid colors, a much better (4K) video quality and a larger aperture to capture better images in low-light environments.
The Samsung Galaxy M21 has a superior battery lifetime than Galaxy S4, because it has a 131 percent greater battery capacity.
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