Samsung Galaxy S21 vs Samsung Galaxy S6
| Type | Touch | Touch |
| Waterproofness & dust-resistance | IP68 |  |
| Dimensions | - | 143.40 x 70.50 x 6.80 mm |
| Weight | | 138.00 g |
| Display size | 6.20" | 5.10" |
| Display | Color / Dynamic AMOLED 16M colors 120 Hz 1080 x 2400 px (6.20") 424 ppi | Color / Super AMOLED 16M colors 1440 x 2560 px (5.10") 576 ppi |
| Display protection | Corning Gorilla Glass Buy screen protector
 | Corning Gorilla Glass Buy screen protector
|
| Additional display |  | |
| Protection of the secondary display | | |
| Standard battery | Li-Ion 4000 mAhBuy powerbank
| Li-Ion 2550 mAhBuy powerbank
|
| Quick battery charging | Fast Charging | Quick Charge |
| Wireless battery charging | Qi |  |
| Internal memory | 128 GB, 256 GB | 32 GB, 64 GB |
| RAM memory | 8 GB | 3 GB |
| Memory cards | | |
| Operating system | Android 11 | Android 5.0 Lollipop |
| Interface | One UI 3.1 | TouchWiz |
| Processor | Samsung Exynos 2100 | Samsung Exynos 7420 |
| Processor clock | - | 2100 MHz |
| GPU | - | ARM Mali-T760 MP8 @772 MHz |
| Touchscreen | | |
| DualSIM | | |
| SIM cards standard | SingleSIM(nanoSIM) | SingleSIM(nanoSIM) |
| Announced | 1Q 2021 | 1Q 2015 |
| Other names | SM-G991B | SM-G920F |
| GSM frequencies | 850 900 1800 1900 | 850 900 1800 1900 |
| UMTS | 850 900 1900 2100 | 850 900 1900 2100 |
| LTE standard | FDD LTE: 2600, 2100, 1900, 1800, 1700, 900, 850, 800, 700 TDD LTE: 2600, 2500, 2300, 1900 | |
| Standard 5G | FDD 5G: 1900, 1700, 850, 600 TDD 5G: 2500 | |
| CDMA | | |
| Standard TD-SCDMA | | |
| UMA | | |
CAMERAS - BACK
| First camera | | |
| Camera type | Standard | |
| Photo sensor model | | Sony IMX240 |
| Photo matrix | 12 Mpx | 16 Mpx |
| Resolution | | 5312x2988 px |
| Optical zoom | | |
| Flash | LED | LED |
| Dual-colour LED flash | | |
| Video resolution | 7680x4320 px | 3840x2160 px |
| Video formats | H.264, H.265, MPEG4 - 24 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | AF, OIS, f/1.8 | AF, OIS |
| Second camera | | |
| Camera type | Wide-angle | nd |
| Photo matrix | 12 Mpx | nd |
| Optical zoom | | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.264, H.265, MPEG4 - 24 fps | nd |
| Additional | FF, f/2.2 | nd |
| Third camera | | |
| Camera type | Telephoto | nd |
| Photo matrix | 64 Mpx | nd |
| Optical zoom | | nd |
| Flash | LED | nd |
| Dual-colour LED flash | | nd |
| Video formats | H.264, H.265, MPEG4 - 24 fps | nd |
| Additional | AF, OIS, f/2.0 | nd |
CAMERAS - FRONT
| First camera | | |
| Camera type | Portrait | |
| Photo sensor model | | Samsung S5K4E6 |
| Photo matrix | 10 Mpx | 5 Mpx |
| Resolution | | 2592x1944 px |
| Optical zoom | | |
| Flash | | |
| Dual-colour LED flash | | |
| Video resolution | 3840x2160 px | |
| Video formats | H.264, H.265, MPEG4 - 24 fps | H.263, H.264, MPEG4 - 30 fps |
| Additional | AF, f/2.2 | FF |
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 | 42.20 Mbit/s |
| HSUPA | 5.76 Mbit/s | 5.76 Mbit/s |
| HSPA | | |
| HSPA+ | | |
| LTE DL | 2000.00 Mbit/s | - |
| LTE UP | 200.00 Mbit/s | 51.00 Mbit/s |
| WIMAX+ | | |
| GPRS | | |
| EDGE | | |
| Bluetooth | v5.1 | v4.1 |
| A2DP Profile | | |
| HDMI | | |
| WiFi | v802.11 a/b/g/n/ac/ax | 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 | v3.2 Type-C | v2.0 |
| 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 | | |
| MP3 | | |
| Stereo speakers | 2 | |
| Audio Jack | | 3.5 mm |
| HD Voice | | |
| Sound formats | 3GA, AAC, AMR, APE, AWB, DFF, DSF, FLAC, IMY, M4A, MID, MIDI, MXMF, OGA, OGG, OTA, RTTTL, RTX, WAV, WMA, XMF | 3GA, AAC, AMR, AWB, FLAC, IMY, M4A, MID, MIDI, MXMF, OGA, OGG, OTA, 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 | | |