Realme C21 vs Samsung Galaxy Z Fold4

Realme C21

Samsung Galaxy Z Fold4

Network
2G network

GSM 850, 900, 1800, 1900

GSM 850, 900, 1800, 1900; CDMA 800, 1900
3G network

HSDPA 850, 900, 2100

HSDPA 850, 900, 1700(AWS), 1900, 2100; CDMA2000 1xEV-DO
4G network

LTE frequency band 1, 3, 5, 7, 8, 20, 28, 38, 40, 41

LTE frequency band 1, 3, 4, 5, 8, 12, 13, 17, 20, 25, 38, 39, 40, 41
5G network

-

5G band 1, 3, 5, 20, 41, 77, 78 SA/NSA/Sub6/mmWave
HSDPA speed

42.2 Mbps

42.2 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
LTE speed

LTE, Cat4, 150 Mbps download, 51 Mbps upload

LTE-A (7CA), Cat20, 2000 Mbps download, 200 Mbps upload
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Glass front, plastic back, plastic frame

Glass front (Gorilla Glass Victus+) (folded), plastic front (unfolded), glass back (Gorilla Glass Victus+), aluminum frame
SIM

Dual SIM (Nano-SIM, dual stand-by)

Up to two Nano SIM and one eSIM
Height

165.2 mm

155.1 mm
Width

76.4 mm

67.1 mm
Thickness

8.9 mm

14.2-15.8 mm
Height unfolded

-

155.1 mm
Width unfolded

-

130.1 mm
Thickness unfolded

-

6.3 mm
Weight

190 g

263 g
Stylus

-

Yes
Payment

-

Samsung Pay (Visa, MasterCard certified)
Waterproof

-

IPX8, 1.5m and 30 minutes
Colors

Black, Blue

Black, Beige, Burgundy, Graygreen

Display
Display type

IPS LCD

Foldable Dynamic AMOLED 2X
Physical size

6.5 inches

7.6 inches
Resolution

720 x 1600 pixels

1812 x 2176 pixels
Pixel density

270 ppi

373 ppi
Display colors

16777216

16777216
Protection

Scratch resistant, 2.5D curved glass screen, Corning Gorilla Glass 3

-
Display features

-

120Hz, HDR10+, 1200 nits (peak)
Cover display

-

Dynamic AMOLED 2X
Cover display physical size

-

6.2 inches
Cover display resolution

-

904 x 2316 pixels
Cover display features

-

120Hz, 120Hz, Corning Gorilla Glass Victus+

OS
OS

Android 10, Realme UI 1.0 / Android 11, Realme UI 2.0

Android 12L, One UI 4.1.1

Main camera
Camera type

Triple

Triple
Main camera

(wide) , 13 MP, f/2.2 , 26 mm, 1/3.06" , 1.12 µm

(wide) , 50 MP, f/1.8 , 24 mm, 1.0 µm
(macro) , 2 MP, f/2.4

(telephoto) , 10 MP, f/2.4 , 67 mm, 1.0 µm, 3x optical zoom
(depth) , 2 MP, f/2.4

(ultrawide) , 12 MP, f/2.2 , 123˚ , 12 mm, 1.12 µm
Primary camera resolution

2560 x 1920 pixels

8190 x 6144 pixels
Primary camera video

1080p@30fps

4K@60fps, 1080p@60/240fps (gyro-EIS), 720p@960fps (gyro-EIS), HDR10+
Primary camera flash

LED flash

LED flash
Camera features

Autofocus, digital zoom, digital image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, phase detection autofocus

Autofocus, continuous shooting, digital zoom, optical zoom, digital image stabilization, optical image stabilization, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode, phase detection autofocus
Cover camera

10 MP, 26 mm, f/2.2 , 1.22 µm, 1/3"

Connectivity
WLAN

Wi-Fi 802.11b, 802.11g, 802.11n

Wi-Fi 802.11a, 802.11b, 802.11g, 802.11n, 802.11n 5GHz, 802.11ac, 802.11ax
WLAN WiFi Hotspot

Yes

Yes
WLAN WiFi Direct

-

Yes
WLAN WiFi Dual Band

-

Yes
USB

microUSB 2.0

Type-C 3.2
USB On-The-Go

Yes

Yes
Bluetooth

v5.0

v5.2
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
Bluetooth AptX

-

aptX HD
NFC

No

Yes
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

-

Yes
BDS

Yes

Yes