Samsung Galaxy M21 vs Samsung Galaxy A8 2018
| Type | Touch | Touch |
| Waterproofness & dust-resistance |  | IP68 |
| Dimensions | 159.00 x 75.10 x 8.90 mm | 149.20 x 70.60 x 8.40 mm |
| Weight | 188.00 g | 172.00 g |
| Display size | 6.40" | 5.60" |
| Display | Color / Super AMOLED 16M colors 1080 x 2340 px (6.40") 403 ppi | Color / Super AMOLED 16M colors 1080 x 2220 px (5.60") 441 ppi |
| Display protection |   | Corning Gorilla Glass Buy screen protector
|
| Additional display | | |
| Protection of the secondary display | | |
| Talk time (max.) | 4G: 2940 min. (49.0 h) | 3G: 1140 min. (19.0 h) |
| Playback time (max.) | Audio: 131 h (5.5 days) Video: 29 h (1.2 days) | Audio: 43 h (1.8 days) Video: 17 h (0.7 days) |
| Internet browsing time (max.) | WiFi: 22 h (0.9 days) 4G: 22 h (0.9 days) | WiFi: 15 h (0.6 days) 3G: 12 h (0.5 days) 4G: 14 h (0.6 days) |
| Standard battery | Li-Ion 6000 mAhBuy powerbank
| Li-Ion 3000 mAhBuy powerbank
|
| Quick battery charging | Fast Charging | Fast Charging |
| Wireless battery charging | | |
| Internal memory | 64 GB | 32 GB, 64 GB |
| End-user memory | 49.5 GB | 22.7 GB |
| RAM memory | 4 GB | 4 GB |
| Memory cards |  microSD, microSDHC, microSDXC up to 512 GBBuy memory card | microSD, microSDHC, microSDXC up to 400 GBBuy memory card |
| Operating system | Android 10 | Android 7.1.1 Nougat |
| Interface | One UI | - |
| Processor | Samsung Exynos 9611 | Samsung Exynos 7885 |
| Processor clock | 2300 MHz | 2200 MHz |
| GPU | ARM Mali-G72 MP3 | ARM Mali-G71 MP2 |
| Touchscreen | | |
| SAR (10g) | 1,13 W/kg | 1,25 W/kg |
| DualSIM | | |
| SIM cards standard | DualSIM(nanoSIM, nanoSIM) | SingleSIM(nanoSIM) |
| DualSIM mode | dual standby | nd |
| Hybrid DualSIM | | nd |
| Announced | 1Q 2020 | 4Q 2017 |
| Other names | SM-M215F/DS; SM-M215F/DSN | SM-A530F; SM-A530X |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 850 900 1700 1900 2100 |
| LTE standard | FDD LTE: 2600, 2100, 1800, 900, 850, 800 TDD LTE: 2600, 2500, 2300 | FDD LTE: 2600, 2100, 1900, 1800, 1700, 900, 850, 800, 700 TDD LTE: 2600, 2500, 2300 |
| Standard 5G | | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | Standard | |
| Photo matrix | 48 Mpx | 16 Mpx |
| Sensor size | 1/2 | |
| Resolution | 8000x6000 px | |
| Optical zoom | | |
| Digital zoom | 4x | |
| Field of view | 80 ° | |
| Focal length | 26 mm | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | 3840x2160 px | 1920x1080 px |
| Video formats | H.264, H.265, MPEG4 - 30 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | AF, f/2.0 | AF, f/1.7 |
| Second camera | | |
| Camera type | Depth of field | nd |
| Photo matrix | 5 Mpx | nd |
| Optical zoom | | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.264, H.265, MPEG4 - 30 fps | nd |
| Additional | FF, f/2.2 | nd |
| Third camera | | |
| Camera type | Wide-angle | nd |
| Photo matrix | 8 Mpx | nd |
| Sensor size | 1/4 | nd |
| Pixel size | 1,12 µm | nd |
| Optical zoom | | nd |
| Field of view | 123 ° | nd |
| Focal length | 12 mm | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.264, H.265, MPEG4 - 30 fps | nd |
| Additional | FF, f/2.2 | nd |
CAMERAS - FRONT
| First camera | | |
| Camera type | Portrait | |
| Photo matrix | 20 Mpx | 16 Mpx |
| Optical zoom | | |
| Flash | | |
| Dual-colour LED flash | | |
| Video formats | H.264, H.265, MPEG4 - 30 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | FF, f/2.0 | FF, f/1.9 |
| Second camera | | |
| Photo matrix | nd | 8 Mpx |
| Resolution | nd | 3264x2448 px |
| Optical zoom | nd | |
| Flash | nd | |
| Dual-colour LED flash | nd | |
| Video formats | nd | H.263, H.264, MPEG4 - 30 fps |
| Additional | nd | FF, f/1.9 |
SENSORS
| Accelerometer | | |
| Proximity | | |
| Light | | |
| Magnetometer | | |
| Gyroscope | | |
| Barometer | | |
| Altimeter | | |
| Gravity | | |
| Hall-effect | | |
| Iris scanner | | |
| Fingerprint scanner | | |
| Thermometer | | |
| Hygrometer | | |
Data transfer
| xHTML | | |
| WAP | v2.0 | v2.0 |
| HSCSD | | |
| HSDPA | 42.20 Mbit/s | |
| HSUPA | 5.76 Mbit/s | |
| HSPA | | |
| HSPA+ | | |
| LTE DL | 603.00 Mbit/s | 603.00 Mbit/s |
| LTE UP | 102.00 Mbit/s | 51.00 Mbit/s |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | v5.0 | v5.0 LE |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/b/g/n/ac | v802.11 a/b/g/n/ac |
| WiFi frequencies | 2,4 GHz; 5 GHz | 2,4 GHz; 5 GHz |
| WiFi Direct | | |
| WiFi Display | | |
| DLNA | | |
| Miracast | | |
| WiFi hotspot | | |
| IrDA | | |
| USB | v2.0 Type-C | v2.0 Type-C |
| GPS | | |
| A-GPS | | |
| GLONASS | | |
| Beidou | | |
| Galileo | | |
| QZSS | | |
| NFC | | |
COMMUNICATION AND MESSAGING
| Call waiting | | |
| Conferency | | |
| Call forwarding | | |
| Push To Talk | | |
| Instant Messenger | | |
| SMS | | |
| EMS | | |
| MMS | | |
| Dictionary | T9 | XT9 |
| Swype | | |
| e-mail client | POP3, IMAP4, SMTP | POP3, IMAP4, SMTP |
| Hardware QWERTY keyboard | | |
| RSS Reader | | |
Multimedia
| Radio | | z RDS |
| MP3 | | |
| Stereo speakers | | |
| Audio Jack | 3.5 mm | 3.5 mm |
| HD Voice | | |
| Sound formats | 3GA, AAC, AAC+, AMR, AWB, FLAC, IMY, M4A, MID, MXMF, OGA, OGG, OTA, RTTTL, RTX, WAV, WMA, XMF, eAAC+ | 3GA, AAC, AMR, AWB, FLAC, IMY, M4A, MXMF, OGA, OGG, RTTTL, RTX, WAV, WMA, XMF |
| Polyphony | | |
| Video ringtone | | |
| Ring composer | | |
| Games | | |
| Java | ART | ART |
| Videophone | | |
| DVB-H television | | |
| TV-Out | | |
PIM AND ADDITIONAL FUNCTIONS
| Watch | | |
| Stopwatch | | |
| Alarm | | |
| Calculator | | |
| Currency converter | | |
| Organizer | | |
| Calendar | | |
| Flight mode | | |
| SyncML | | |
| Data and fax | | |
| Screensaver | | |
| Themes | | |
| Interchangeable covers | | |
| Voice dial | | |
| Speakerphone | | |
| Recorder | | |
| Vibrations | | |