Screen size
C211.3"
X3Winner: 1.7"+24%
Quick verdict
X3 leads the measured specs 5-3.
Measured wins
C21
3
spec wins
Ties
4
equal specs
X3
5
spec wins
Overall winner
Screen size
Technology
C21
No cellular connectivity
X3
No cellular connectivity
2G bands
C21
N/A
X3
N/A
3G bands
C21
N/A
X3
N/A
4G bands
C21
N/A
X3
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
USB
5G support
equal specsNFC
equal specs3.5mm jack
equal specsSD card
equal specsStereo speakers
Speed
C21
No
X3
No
GPRS
C21
No
X3
No
EDGE
C21
No
X3
No
Announced
C21
2023, November
X3
2025, March
Status
C21
Available. Released 2023, November
X3
Available. Released 2025, March
Dimensions
C21
46.5 x 46.5 x 13 mm (1.83 x 1.83 x 0.51 in)
X3
53.8 x 53.8 x 13.5 mm (2.12 x 2.12 x 0.53 in)
Weight
C21
-
X3
94.6 g (3.35 oz)
Build
C21
Zinc alloy frame
X3
Zinc alloy frame and rear
SIM
C21
No
X3
No
Other
C21
IP68 dust tight and water resistant (immersible up to 1.5m for 30 min)
X3
Waterproof (5ATM)
Type
C21
TFT LCD
X3
TFT LCD
Size
C21
1.32 inches
X3
1.73 inches
Resolution
C21
360 x 360 pixels (~386 ppi density)
X3
466 x 466 pixels (~381 ppi density)
Protection
C21
Corning Gorilla Glass
X3
-
OS
C21
Proprietary OS
X3
Proprietary OS
Card slot
C21
No
X3
No
Internal
C21
128MB
X3
16MB
Other
C21
No
X3
No
Loudspeaker
C21
No
X3
Yes
3.5mm jack
C21
No
X3
No
WLAN
C21
No
X3
No
Bluetooth
C21
5.0, A2DP
X3
5.3, A2DP
Positioning
C21
No
X3
Unspecified
NFC
C21
No
X3
No
Radio
C21
No
X3
No
USB
C21
No
X3
No
Sensors
C21
Accelerometer, heart rate, SpO2, blood pressure
X3
Accelerometer, heart rate, SpO2, barometer, compass
Type
C21
300 mAh
X3
900 mAh
Colors
C21
Black, Silver
X3
Black
Price
C21
About 40 EUR
X3
-