Screen size
C512.4"
S1Winner: 5.0"+52%
Quick verdict
S1 leads the measured specs 13-0.
Measured wins
C51
0
spec wins
Ties
4
equal specs
S1
13
spec wins
Overall winner
Screen size
Technology
C51
GSM
S1
GSM / HSPA
2G bands
C51
GSM 900 / 1800 - SIM 1 & SIM 2
S1
GSM 900 / 1800 - SIM 1 & SIM 2
GPRS
C51
No
S1
-
EDGE
C51
No
S1
-
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
3G bands
C51
-
S1
HSDPA 2100
Speed
C51
-
S1
HSPA
Announced
C51
2014
S1
2014, February. Released 2014, February
Status
C51
Discontinued
S1
Discontinued
Dimensions
C51
-
S1
144 x 71 x 8.9 mm (5.67 x 2.80 x 0.35 in)
Weight
C51
-
S1
137 g (4.83 oz)
SIM
C51
Dual SIM
S1
Dual SIM
Type
C51
TFT
S1
IPS LCD
Size
C51
2.4 inches, 17.8 cm2
S1
5.0 inches, 68.9 cm2 (~67.4% screen-to-body ratio)
Resolution
C51
240 x 320 pixels, 4:3 ratio (~167 ppi density)
S1
1080 x 1920 pixels, 16:9 ratio (~441 ppi density)
Card slot
C51
microSDHC
S1
microSDHC (dedicated slot)
Phonebook
C51
Yes
S1
-
Call records
C51
Yes
S1
-
Internal
C51
-
S1
16GB 1GB RAM
Single
C51
1.3 MP
S1
13 MP, AF
Video
C51
Yes
S1
Yes
Features
C51
-
S1
LED flash
Other
C51
No
S1
-
Single
C51
-
S1
8 MP
Video
C51
-
S1
Loudspeaker
C51
Yes
S1
Yes
3.5mm jack
C51
Yes
S1
Yes
WLAN
C51
No
S1
Wi-Fi 802.11 b/g/n, hotspot
Bluetooth
C51
2.0
S1
4.0, A2DP
Positioning
C51
No
S1
GPS
NFC
C51
No
S1
No
Radio
C51
FM radio
S1
FM radio
USB
C51
microUSB
S1
microUSB 2.0
Sensors
C51
S1
Accelerometer, proximity
Messaging
C51
SMS
S1
-
Games
C51
Yes
S1
-
Java
C51
No
S1
-
Other
C51
Audio/video player
S1
-
Type
C51
Li-Ion 1000 mAh, removable
S1
Li-Ion 2300 mAh battery
Colors
C51
Brown, Champagne, Black
S1
Black
OS
C51
-
S1
Android 4.2.1 (Jelly Bean)
CPU
C51
-
S1
Quad-core 1.5 GHz