Compare Karbonn A1 Plus vs Karbonn A21 vs Asus Zenfone Zoom ZX551ML 128GB

Summary
37%
47%
85%
Display

3.5" (Small)

320x480, Low sharpness

4.5" (Medium)

480x800, Avg sharpness

5.5" (Large)

Full HD, Very Sharp

Performance

Single core

1 GHz, 256 MB RAM

Dual core

1.2 GHz, 512 MB RAM

Quad core

2.5 GHz, 4 GB RAM

Storage

165 MB

32 GB (Expandable)

4 GB

32 GB (Expandable)

128 GB

128 GB (Expandable)

Camera

3 MP (Main)

0.3 MP (Front)

5 MP (Main)

1.3 MP (Front)

13 MP (Main)

5 MP (Front)

Battery

1500 mAh

4 h talktime (2G)

1800 mAh

5 h talktime (2G)

3000 mAh

Expert Rating

★★★★★
★★★★★

Read Expert Review

User Rating

★★★★★
★★★★★

3.4/5 based on 417 ratings

Read All User Reviews

★★★★★
★★★★★

4/5 based on 74 ratings

Read All User Reviews

★★★★★
★★★★★

4.2/5 based on 14 ratings

Read All User Reviews

General
Launch Date

September 26, 2012 (Official)

October 11, 2012 (Official)

January 22, 2016 (Official)

Operating System

Android v2.3 (Gingerbread)

Android v4 (Ice Cream Sandwich)

Android v5.0 (Lollipop)

SIM Slot(s)

Dual SIM, GSM+GSM

Dual SIM, GSM+GSM

Single SIM, GSM

SIM Size

SIM1: Micro

Network

2G: Yes

3G: Yes, 2G: Yes

4G: Yes (supports Indian bands)
3G: Yes, 2G: Yes

Design
Size Compare
Size Compare
Size Compare
Dimensions

Height: 114.5 mm
Width: 60.6 mm
Thickness: 13.8 mm

Height: 112 mm
Width: 60.5 mm
Thickness: 11.5 mm

Height: 158.9 mm
Width: 78.8 mm
Thickness: 11.9 mm

Weight

130 grams

104 grams

185 grams

Colours

Display
Poor
Poor
Very Good
Screen Resolution

320 x 480 pixels

480 x 800 pixels

Full HD (1080 x 1920 pixels)

Pixel Density

165 ppi

207 ppi

401 ppi

Display Type

TFT

TFT

IPS LCD

Screen Protection

Corning Gorilla Glass v4, Scratch-resistant glass

Touch Screen

Capacitive Touchscreen, Multi-touch

Capacitive Touchscreen, Multi-touch

Capacitive Touchscreen, Multi-touch

Screen to Body Ratio

66.56 %

Performance
Poor
Poor
Very Good
Chipset

MediaTek MT6572

Qualcomm Snapdragon S4 Play MSM8225

Intel Atom Z3590

Processor

Single core, 1 GHz

Dual core, 1.2 GHz, Cortex A5

Quad core, 2.5 GHz

Architecture

64 bit

Graphics

Mali-400 MP2

Adreno 203

PowerVR G6430

RAM

256 MB

512 MB

4 GB

Storage
Poor
Good
Best in Class
Internal Memory

165 MB

4 GB

128 GB

Expandable Memory

Up to 32 GB

Up to 32 GB

Up to 128 GB

Camera
Poor
Average
Very Good
Main Camera
Resolution

3 MP

5 MP

13 MP

Autofocus

Laser autofocus

Aperture

4.8 F

Optical Image Stabilisation

Flash

LED Flash

LED Flash

Dual-color LED Flash

Image Resolution

2048 x 1536 Pixels

2592 x 1944 Pixels

4160 x 3120 Pixels

Settings

Exposure compensation, ISO control

Shooting Modes

Continuos Shooting

Continuos Shooting, High Dynamic Range mode (HDR)

Camera Features

Digital Zoom

Digital Zoom

Digital Zoom, 3 x Optical Zoom, Auto Flash, Face detection, Touch to focus

Video Recording

1920x1080 @ 30 fps

Front Camera
Resolution

0.3 MP

1.3 MP

5 MP

Camera Features

Fixed Focus

Wide Angle Selfie

Battery
Average
Below Average
Very Good
Capacity

1500 mAh

1800 mAh

3000 mAh

Type

Li-ion

Li-ion

Li-Polymer

Not User Replaceable

Standby Time

Up to 240 Hours(2G)

Up to 200 Hours(2G)

Network & Connectivity
SIM Size

SIM1: Micro

SIM 1

2G

3G, 2G

4G (supports Indian bands), 3G, 2G

SIM 2

2G

2G

Bluetooth

v2.1

v2.1

v4.0

GPS

with A-GPS, Glonass

NFC

USB Connectivity

microUSB 2.0

USB 2.0, microUSB 2.0

Mass storage device, USB charging, microUSB 2.0

Multimedia
FM Radio

Loudspeaker

Audio Jack

3.5 mm

3.5 mm

3.5 mm

Special Features
Other Sensors

Proximity sensor, Accelerometer

Accelerometer

Light sensor, Proximity sensor, Accelerometer, Compass, Gyroscope

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