OPPO K13 5G vs Vivo X21 comparison

Show Only Differences Highlight Differences	OPPO K13 5G	Vivo X21
key specs
Display	6.70-inch	6.28-inch
Processor	Qualcomm Snapdragon 6 Gen 4	Qualcomm Snapdragon 660
Front Camera	16-megapixel	12-megapixel
Rear Camera	50-megapixel + 2-megapixel	12-megapixel + 5-megapixel
RAM	8GB	6GB
Storage	128GB, 256GB	128GB
Battery Capacity	7000mAh	3200mAh
OS	Android 15	Android 8.1
Resolution	1080x2400 pixels	1080x2280 pixels
general
Brand	OPPO	Vivo
Model	K13 5G	X21
Release date	April 21, 2025	March 1, 2018
AI Enabled	Yes	-
Launched in India	Yes	Yes
Form factor	Touchscreen	Touchscreen
Thickness	8.45	-
Weight (g)	208.00	156.20
IP rating	IP65	-
Battery capacity (mAh)	7000	3200
Fast charging	80W Fast Charging	Proprietary
Colours	Icy Purple, Prism Black	Black, Gold
Dimensions (mm)	-	154.50 x 74.80 x 7.40
Removable battery	-	No
display
Refresh Rate	120 Hz	-
Resolution Standard	FHD+	-
Screen size (inches)	6.70	6.28
Touchscreen	Yes	Yes
Resolution	1080x2400 pixels	1080x2280 pixels
Aspect ratio	-	19:9
hardware
Processor	octa-core	2.2GHz octa-core
Processor make	Qualcomm Snapdragon 6 Gen 4	Qualcomm Snapdragon 660
RAM	8GB	6GB
Internal storage	128GB, 256GB	128GB
Expandable storage	-	Yes
Expandable storage type	-	microSD
Expandable storage up to (GB)	-	256
camera
Rear camera	50-megapixel (f/1.85) + 2-megapixel	12-megapixel (f/1.8, 1.4-micron) + 5-megapixel (f/2.4)
No. of Rear Cameras	2	-
Front camera	16-megapixel (f/2.4)	12-megapixel (f/2.0)
No. of Front Cameras	1	-
Rear autofocus	-	Phase detection autofocus
Rear flash	-	LED
software
Operating system	Android 15	Android 8.1
Skin	ColorOS 15	FunTouch 4.0
connectivity
Wi-Fi	Yes	Yes
Wi-Fi standards supported	802.11 a/b/g/n/ac	802.11 a/b/g/n/ac
GPS	Yes	Yes
Bluetooth	Yes	Yes, v 5.00
USB Type-C	Yes	-
Number of SIMs	2	2
Active 4G on both SIM cards	Yes	-
NFC	-	No
Infrared	-	No
USB OTG	-	Yes
Micro-USB	-	Yes
Headphones	-	3.5mm
FM	-	No
sim 2
SIM Type	Nano-SIM	Nano-SIM
4G/ LTE	Yes	Yes
5G	Yes	-
GSM/CDMA	-	GSM
3G	-	Yes
sensors
In-Display Fingerprint Sensor	Yes	-
Compass/ Magnetometer	Yes	Yes
Proximity sensor	Yes	Yes
Accelerometer	Yes	Yes
Ambient light sensor	Yes	Yes
Gyroscope	Yes	Yes
Fingerprint sensor	-	Yes
ratings
Overall NDTV Rating	-	Read Review
Design Rating	-
Display Rating	-
Software Rating	-
Performance Rating	-
Battery Life Rating	-
Camera Rating	-
Value for Money Rating	-
sim 1
SIM Type	-	Nano-SIM
GSM/CDMA	-	GSM
3G	-	Yes
4G/ LTE	-	Yes