Redmi 15 5G vs Vivo X21 UD comparison

Show Only Differences Highlight Differences	Redmi 15 5G	Vivo X21 UD
key specs
Display	6.90-inch	6.28-inch
Front Camera	8-megapixel	12-megapixel
Rear Camera	50-megapixel	12-megapixel
RAM	6GB, 8GB	6GB
Storage	128GB, 256GB	128GB
Battery Capacity	7000mAh	3200mAh
OS	Android 15	Android 8.1
Resolution	1080x2340 pixels	1080x2280 pixels
Processor	-	Qualcomm Snapdragon 660
general
Brand	Redmi	Vivo
Model	15 5G	X21 UD
Release date	August 19, 2025	March 1, 2018
AI Enabled	Yes	-
Launched in India	Yes	-
Form factor	Touchscreen	Touchscreen
Dimensions (mm)	168.48 x 80.45 x 8.40	154.50 x 74.80 x 7.40
Weight (g)	217.00	156.20
IP rating	IP64	-
Battery capacity (mAh)	7000	3200
Fast charging	33W Fast Charging	-
Colours	Frosted White, Midnight Black, Sandy Purple	Ruby Red, Aurora White, Black
display
Refresh Rate	144 Hz	-
Resolution Standard	FHD+	-
Screen size (inches)	6.90	6.28
Touchscreen	Yes	Yes
Resolution	1080x2340 pixels	1080x2280 pixels
Pixels per inch (PPI)	374	-
hardware
Processor make	Qualcomm Snapdragon 6s Gen 3	Qualcomm Snapdragon 660
RAM	6GB, 8GB	6GB
Internal storage	128GB, 256GB	128GB
Processor	-	octa-core
camera
Rear camera	50-megapixel (f/1.75)	12-megapixel
No. of Rear Cameras	2	-
Rear flash	Yes	LED
Front camera	8-megapixel (f/2.2)	12-megapixel
No. of Front Cameras	1	-
software
Operating system	Android 15	Android 8.1
Skin	HyperOS 2.0	FunTouch 4.0
connectivity
Wi-Fi	Yes	Yes
GPS	Yes	Yes
Bluetooth	Yes	Yes, v 5.00
Infrared	Yes	-
USB Type-C	Yes	-
Number of SIMs	2	2
Wi-Fi standards supported	-	802.11 a/b/g/n/ac
USB OTG	-	Yes
Headphones	-	3.5mm
sensors
Fingerprint sensor	Yes	-
Compass/ Magnetometer	Yes	Yes
Proximity sensor	Yes	Yes
Accelerometer	Yes	-
Ambient light sensor	-	Yes
Gyroscope	-	Yes
sim 1
SIM Type	-	Micro-SIM
GSM/CDMA	-	GSM
3G	-	Yes
4G/ LTE	-	Yes
sim 2
SIM Type	-	Micro-SIM
GSM/CDMA	-	GSM
3G	-	Yes
4G/ LTE	-	Yes

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