Vivo Y400 5G vs Vivo X21 UD comparison

Show Only Differences Highlight Differences	Vivo Y400 5G	Vivo X21 UD
key specs
Display	6.67-inch	6.28-inch
Processor	Qualcomm Snapdragon 4 Gen 2	Qualcomm Snapdragon 660
Front Camera	32-megapixel	12-megapixel
Rear Camera	50-megapixel + 2-megapixel	12-megapixel
RAM	8GB	6GB
Storage	128GB, 256GB	128GB
Battery Capacity	6000mAh	3200mAh
OS	Android 15	Android 8.1
Resolution	1080x2400 pixels	1080x2280 pixels
general
Brand	Vivo	Vivo
Model	Y400 5G	X21 UD
Release date	August 4, 2025	March 1, 2018
Launched in India	Yes	-
Form factor	Touchscreen	Touchscreen
Dimensions (mm)	162.29 x 75.31 x 7.90	154.50 x 74.80 x 7.40
Weight (g)	197.00	156.20
IP rating	IP69	-
Battery capacity (mAh)	6000	3200
Removable battery	No	-
Fast charging	90W Fast Charging	-
Wireless charging	No	-
Colours	Glam White, Olive Green	Ruby Red, Aurora White, Black
display
Refresh Rate	120 Hz	-
Resolution Standard	FHD+	-
Screen size (inches)	6.67	6.28
Touchscreen	Yes	Yes
Resolution	1080x2400 pixels	1080x2280 pixels
Pixels per inch (PPI)	394	-
hardware
Processor	octa-core	octa-core
Processor make	Qualcomm Snapdragon 4 Gen 2	Qualcomm Snapdragon 660
RAM	8GB	6GB
Internal storage	128GB, 256GB	128GB
camera
Rear camera	50-megapixel + 2-megapixel	12-megapixel
No. of Rear Cameras	2	-
Rear flash	Yes	LED
Front camera	32-megapixel	12-megapixel
No. of Front Cameras	1	-
software
Operating system	Android 15	Android 8.1
Skin	FuntouchOS 15	FunTouch 4.0
connectivity
Wi-Fi	Yes	Yes
GPS	Yes	Yes
Bluetooth	Yes	Yes, v 5.00
NFC	No	-
USB OTG	Yes	Yes
USB Type-C	Yes	-
Headphones	Type-C	3.5mm
Number of SIMs	2	2
Active 4G on both SIM cards	Yes	-
Wi-Fi standards supported	-	802.11 a/b/g/n/ac
sim 1
SIM Type	Nano-SIM	Micro-SIM
GSM/CDMA	-	GSM
3G	-	Yes
4G/ LTE	-	Yes
sim 2
SIM Type	Nano-SIM	Micro-SIM
GSM/CDMA	-	GSM
3G	-	Yes
4G/ LTE	-	Yes
sensors
In-Display Fingerprint Sensor	Yes	-
Compass/ Magnetometer	Yes	Yes
Proximity sensor	Yes	Yes
Accelerometer	Yes	-
Ambient light sensor	Yes	Yes
Gyroscope	Yes	Yes

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