Oppo K11 vs Realme C21

Network
2G network

GSM 850, 900, 1800, 1900; CDMA 800

GSM 850, 900, 1800, 1900
3G network

HSDPA 850, 900, 1700(AWS), 1900, 2100; CDMA2000 1x

HSDPA 850, 900, 2100
4G network

LTE frequency band 1, 2, 3, 4, 5, 7, 8, 28, 34, 38, 39, 40, 41

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

5G band 1, 3, 5, 8, 28, 40, 41, 77, 78 SA/NSA

-
HSDPA speed

42.2 Mbps

42.2 Mbps
HSUPA speed

5.76 Mbps

5.76 Mbps
LTE speed

LTE-A (CA), 750 Mbps download, 211 Mbps upload

LTE, Cat4, 150 Mbps download, 51 Mbps upload
GPRS

Yes

Yes
EDGE

Yes

Yes

Design
Build

Glass front, plastic frame, plastic back

Glass front, plastic back, plastic frame
SIM

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

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

162.7 mm

165.2 mm
Width

75.5 mm

76.4 mm
Thickness

8.2 mm

8.9 mm
Weight

184 g

190 g
Colors

Blue, Gray

Black, Blue

Display
Display type

AMOLED

IPS LCD
Physical size

6.7 inches

6.5 inches
Resolution

1080 x 2400 pixels

720 x 1600 pixels
Pixel density

393 ppi

270 ppi
Display colors

1073741824

16777216
Protection

-

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

120Hz, HDR10+, 500 nits (typical), 1100 nits (peak)

-

OS
OS

Android 13, ColorOS 13.1

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

Main camera
Camera type

Triple

Triple
Main camera

(wide) , 50 MP, f/1.8 , 84˚ , 24 mm, 1/1.56" , 1.0 µm

(wide) , 13 MP, f/2.2 , 26 mm, 1/3.06" , 1.12 µm
(ultrawide) , 8 MP, f/2.2 , 1/4" , 1.12 µm

(macro) , 2 MP, f/2.4
(macro) , 2 MP, f/2.4

(depth) , 2 MP, f/2.4
Primary camera resolution

8120 x 6180 pixels

2560 x 1920 pixels
Primary camera video

4K@30fps, 1080p@30/60/120fps, gyro-EIS

1080p@30fps
Primary camera flash

LED flash

LED flash
Camera features

Autofocus, continuous shooting, digital 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, macro-mode, phase detection autofocus

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

Selfie camera
Selfie camera type

Single

Single
Selfie camera

(wide) , 16 MP, f/2.4 , 24 mm, 1.0 µm

(wide) , 5 MP, f/2.2 , 1.12 µm, 1/5.0"
Selfie camera resolution

4608 x 3456 pixels

2560 x 1920 pixels
Selfie camera features

-

Face unlock, HDR, panorama
Selfie camera video

1080p@30fps, gyro-EIS

1080p@30fps

Connectivity
WLAN

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

Wi-Fi 802.11b, 802.11g, 802.11n
WLAN WiFi Hotspot

Yes

Yes
WLAN WiFi Direct

Yes

-
WLAN WiFi Dual Band

Yes

-
USB

Type-C 2.0

microUSB 2.0
USB On-The-Go

Yes

Yes
Bluetooth

v5.2

v5.0
Bluetooth A2DP

Yes

Yes
bluetooth LE

Yes

Yes
Bluetooth AptX

aptX HD

-
NFC

Yes

No
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

Yes

Yes
GALILEO

Yes

-
BDS

Yes

Yes
QZSS

Yes

-