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Model

Compare Ark Elf S8 and Cat S31

Ark Elf S8 vs Cat S31

Ark Elf S8

Cat S31

Ark Elf S8

Cat S31

Network
2G network

GSM 850, 900, 1800, 1900

GSM 850, 900, 1800, 1900
3G network

HSDPA 900, 2100

HSDPA 850, 900, 1900, 2100 - EU; HSDPA 850, 900, 1700(AWS), 1900, 2100 - USA
4G network

-

LTE frequency band 1(2100), 2(1900), 3(1800), 5(850), 7(2600), 8(900), 20(800) - EU; LTE frequency band 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 12(700), 17(700) - USA
LTE speed

-

LTE, Cat4, 150 Mbps download, 50 Mbps upload
GPRS

Yes

Yes
EDGE

Yes

Yes

Availability
Oficially announced

2018-2

2017-9
Status

2018-2

2017-10

Design
Build

Plastic

-
SIM

Dual SIM (Micro-SIM, dual SIM stand-by)

Single SIM (Nano-SIM) or Dual SIM (Nano-SIM, dual stand-by)
Height

151.7 mm

146 mm
Width

72.3 mm

74.4 mm
Thickness

9.4 mm

12.6 mm
Weight

157 g

200 g
Waterproof

-

IP68, 1.2 m and 35 minutes
Dust proof

-

IP68
MIL-STD-810G

-

Yes - dust, humidity, rain, salt, vibration, solar radiation, transport and thermal shock resistant
Colors

Black, Blue

Black

Display
Display type

TFT capacitive touchscreen

TFT capacitive touchscreen
Physical size

5.72 inches

4.7 inches
Resolution

480 x 960 pixels

720 x 1280 pixels
Pixel density

188 ppi

312 ppi
Display colors

16777216

-
Protection

2.5D curved glass screen

Corning Gorilla Glass 3
Multitouch

Yes

Yes

Hardware
CPU

Quad-core 1.3 GHz Cortex-A7

Quad-core 1.3 GHz Cortex-A7 ARM
Chipset

Mediatek MT6580

Qualcomm MSM8909 Snapdragon 210
GPU

Mali-400 MP2

Adreno 304
Internal storage

8 GB

16 GB
Memory RAM

1 GB

2 GB
Memory card

microSD, microSDHC

microSD
Memory card max

32 GB

64 GB

OS
OS

Android 6.0 Marshmallow

Android 7.0 (Nougat)

Main camera
Camera type

Single

-
Main camera

8 MP

8 MP
Primary camera resolution

3264 x 2448 pixels

-
Primary camera video

720p@30fps

720p@30fps
Primary camera Autofocus

-

autofocus
Primary camera flash

dual-LED flash

LED flash
Camera features

Autofocus, continuous shooting, digital zoom, geotagging, panorama, HDR, touch focus, face detection, white balance settings, ISO settings, exposure compensation, self-timer, scene-mode

Geo-tagging, face detection, touch focus

Selfie camera
Selfie camera

2 MP

2 MP
Selfie camera resolution

1600 x 1200 pixels

-
Selfie camera video

480p@30fps

-

Sound
3.5mm jack

Yes

Yes
Loudspeaker

Yes

Yes
Notifications

-

Vibration; MP3, WAV ringtones
Earpiece

Yes

-

Multimedia
Radio

FM Radio

-
Radio FM

-

FM radio

Connectivity
WLAN

Wi-Fi 802.11b, 802.11g, 802.11n

Wi-Fi 802.11b, 802.11g, 802.11n
WLAN WiFi Hotspot

Yes

Yes
USB

microUSB 2.0

microUSB 2.0
USB On-The-Go

-

Yes
Bluetooth

v4.0

v4.1
Bluetooth A2DP

Yes

Yes
bluetooth LE

-

Yes
GPS

Yes, with A-GPS

Yes, with A-GPS
GLONASS

-

Yes
BDS

-

Yes

Features
Messaging SMS

-

SMS(threaded view)
Messaging MMS

-

MMS
Messaging Email

-

Email
Messaging IM

-

IM
Messaging Push Email

-

Push Email
Java

-

No
Sensors

Accelerometer, proximity, light

Accelerometer, compass, proximity

Browser
HTML

HTML5

HTML5

Battery
Battery type

Li-Ion

Li-Ion
Battery capacity

2500 mAh

4000 mAh
Battery removable

Removable

Non-removable
Talk time 2G

7 h

-
Talk time 3G

7 h

-

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