Screen size
iQOO Pad6 ProWinner: 13.2"+52%
X21 UD6.3"
Quick verdict
iQOO Pad6 Pro leads the measured specs 14-5.
Measured wins
iQOO Pad6 Pro
14
spec wins
Overall winner
Ties
3
equal specs
X21 UD
5
spec wins
Screen size
Technology
iQOO Pad6 Pro
No cellular connectivity
X21 UD
GSM / CDMA / HSPA / LTE
2G bands
iQOO Pad6 Pro
N/A
X21 UD
GSM 850 / 900 / 1800 / 1900 , CDMA 800 & TD-SCDMA
3G bands
iQOO Pad6 Pro
N/A
X21 UD
HSDPA 850 / 900 / 1900 / 2100
4G bands
iQOO Pad6 Pro
N/A
Resolution
Refresh rate
Peak brightness
Pixel density
CPU speed
RAM
Storage
Main camera
Front camera
Battery
Wired charging
Weight
Thickness
IP rating
Wi‑Fi
Bluetooth
equal specsUSB
5G support
equal specsNFC
equal specs3.5mm jack
SD card
Stereo speakers
X21 UD
1, 2, 3, 5, 8, 34, 38, 39, 40, 41
GPRS
iQOO Pad6 Pro
No
X21 UD
-
EDGE
iQOO Pad6 Pro
No
X21 UD
-
Speed
iQOO Pad6 Pro
-
X21 UD
HSPA 42.2/5.76 Mbps, LTE (2CA) Cat6 300/50 Mbps
Announced
iQOO Pad6 Pro
2026, May 20
X21 UD
2018, March. Released 2018, March
Status
iQOO Pad6 Pro
Available. Released 2026, May 20
X21 UD
Discontinued
Dimensions
iQOO Pad6 Pro
297 x 199.8 x 6.2 mm (11.69 x 7.87 x 0.24 in)
X21 UD
154.5 x 74.8 x 7.4 mm (6.08 x 2.94 x 0.29 in)
Weight
iQOO Pad6 Pro
663 g (1.46 lb)
X21 UD
156.2 g (5.50 oz)
Build
iQOO Pad6 Pro
Glass front, aluminum back, aluminum frame
X21 UD
Glass front (Gorilla Glass 3), aluminum back, aluminum frame
SIM
iQOO Pad6 Pro
No
X21 UD
Nano-SIM + Nano-SIM
Other
iQOO Pad6 Pro
Stylus support
X21 UD
-
Type
iQOO Pad6 Pro
IPS LCD, 1B colors, 144Hz, HDR, 1200 nits (peak)
X21 UD
Super AMOLED
Size
iQOO Pad6 Pro
13.2 inches, 515.0 cm2 (~86.8% screen-to-body ratio)
X21 UD
6.28 inches, 98.4 cm2 (~85.2% screen-to-body ratio)
Resolution
iQOO Pad6 Pro
2512 x 3840 pixels, 3:2 ratio (~348 ppi density)
X21 UD
1080 x 2280 pixels, 19:9 ratio (~402 ppi density)
Protection
iQOO Pad6 Pro
-
X21 UD
Corning Gorilla Glass 3
OS
iQOO Pad6 Pro
Android 16, OriginOS 6
X21 UD
Android 8.1 (Oreo), Funtouch 4
Chipset
iQOO Pad6 Pro
Qualcomm SM8850-AC Snapdragon 8 Elite Gen 5 (3 nm)
X21 UD
Qualcomm SDM660 Snapdragon 660 (14 nm)
CPU
iQOO Pad6 Pro
Octa-core (2x4.6 GHz Oryon V3 Phoenix L + 6x3.62 GHz Oryon V3 Phoenix M)
X21 UD
Octa-core (4x2.2 GHz Kryo 260 Gold & 4x1.8 GHz Kryo 260 Silver)
GPU
iQOO Pad6 Pro
Adreno 840
X21 UD
Adreno 512
Card slot
iQOO Pad6 Pro
No
X21 UD
microSDXC (uses shared SIM slot)
Internal
iQOO Pad6 Pro
256GB 8GB RAM, 256GB 12GB RAM, 512GB 12GB RAM, 512GB 16GB RAM
X21 UD
128GB 6GB RAM
Other
iQOO Pad6 Pro
UFS 4.1
X21 UD
eMMC 5.1
Single
iQOO Pad6 Pro
13 MP
X21 UD
-
Features
iQOO Pad6 Pro
LED flash, panorama
X21 UD
LED flash, HDR, panorama
Video
iQOO Pad6 Pro
4K, 1080p
X21 UD
1080p@30fps
Dual
iQOO Pad6 Pro
-
X21 UD
12 MP, f/1.8, 1/2.55", 1.4µm, dual pixel PDAF Auxiliary lens
Single
iQOO Pad6 Pro
8 MP
X21 UD
12 MP, f/2.0, (wide), 1/2.8", 1.28µm
Video
iQOO Pad6 Pro
1080p@30fps
X21 UD
1080p@30fps
Loudspeaker
iQOO Pad6 Pro
Yes, with stereo speakers (8 speakers)
X21 UD
Yes
3.5mm jack
iQOO Pad6 Pro
No
X21 UD
Yes
Other
iQOO Pad6 Pro
-
X21 UD
32-bit/192kHz Hi-Res audio
WLAN
iQOO Pad6 Pro
Wi-Fi 802.11 a/b/g/n/ac/6/7 dual-band
X21 UD
Wi-Fi 802.11 a/b/g/n/ac, dual-band, Wi-Fi Direct
Bluetooth
iQOO Pad6 Pro
5.4, A2DP, LE
X21 UD
5.0, A2DP, LE
Positioning
iQOO Pad6 Pro
Unspecified
X21 UD
GPS, GLONASS
NFC
iQOO Pad6 Pro
No
X21 UD
No
Radio
iQOO Pad6 Pro
No
X21 UD
FM radio
USB
iQOO Pad6 Pro
USB Type-C 3.2, OTG, magnetic connector
X21 UD
microUSB 2.0, OTG
Sensors
iQOO Pad6 Pro
Accelerometer, gyro, proximity (accessories only)
X21 UD
Fingerprint (under display, optical), accelerometer, proximity, compass
Type
iQOO Pad6 Pro
13000 mAh
X21 UD
Li-Ion 3200 mAh, non-removable
Charging
iQOO Pad6 Pro
66W wired, PD 5W reverse wired
X21 UD
18W wired
Colors
iQOO Pad6 Pro
Green, Gray, Silver
X21 UD
Black, Ruby Red
Price
iQOO Pad6 Pro
About 540 EUR
X21 UD
About 550 EUR
Models
iQOO Pad6 Pro
-
X21 UD
X21UD A