Select City

Karbonn X21 vs Zen Ultrafone 303 Elite

Key Feature Comparison

4.1

Karbonn X21

Check Price
close
3.6

Zen Ultrafone 303 Elite

Check Price
close
Add more phone to compare

At a Glance

Show differences only

Octa core, 1.6 GHz, Cortex A55

Unisoc SC9863, PowerVR GE8322

Dual core, 1.2 GHz

3000 mAh

Li-ion

1600 mAh

Li-ion

5.45 inches

295 ppi, HD

4.0 inches

233 ppi

Single, 8MP

Single, 3.2MP

4G

Dual SIM, GSM+GSM

3G

Dual SIM, GSM+GSM

Detailed Specs

Screen Size

5.45 inches
4.0 inches

Screen Type

IPS LCD
IPS LCD

Screen Resolution

720 x 1440 pixels
480 x 800 pixels

Pixel Density

295 ppi
233 ppi

Aspect Ratio

18:09
-

Screen to Body Ratio

72.38%
-

Screen Design

Bezel-less
-

Screen Quality

HD
-

Phone Variants

2GB 32GB
256MB 2GB

Expandable Storage

Yes
Yes

Expandable Storage Capacity

Yes, 256 GB
32 GB

Sensors

Light sensor, Proximity sensor, Accelerometer
Light sensor, Proximity sensor, Accelerometer

Operating System

Android v10
Android v4.4.2 (Kitkat)

GPU

PowerVR GE8322
-

Chipset

Unisoc SC9863
-

CPU

Octa core, 1.6 GHz, Cortex A55
Dual core, 1.2 GHz

Custom User Interface

Android Go
-

Clock Speed

1.6 GHz
1.2 GHz

Architecture

64 bit
-

Battery Capacity

3000 mAh
1600 mAh

Battery Removable

Yes
Yes

Battery Type

Li-ion
Li-ion

USB Type-C

No
-

Announced On

15-Jun-21
29-Dec-14

Market Status

Available
Available

Brand

Karbonn
Zen

Model Number

X21
-

Price Status

Confirmed
Confirmed

Price

Rs. 5,999
Rs. 3,170

GPS

Yes A-GPS
Yes

NFC

No
-

Network Support

4G
3G

Bluetooth

Yes
Yes

3.5mm Audio Jack

Yes
Yes

SIM Size

SIM1: Nano, SIM2: Nano
-

Wi-Fi

Yes, Wi-Fi 802.11, a/b/g/n
Wi-Fi 802.11, b/g/n

Bluetooth Type

v4.2
-

Audio Jack

3.5 mm
3.5 mm

SIM Slot(s)

Dual SIM, GSM+GSM
Dual SIM, GSM+GSM

eSIM

No
-

Wi-Fi Features

Mobile Hotspot
-

VoLTE

Yes
-

SIM 1 Bands

4G Bands: TD-LTE 2300(band 40), FD-LTE 1800(band 3), 3G Bands: UMTS 1900 / 2100 / 850 / 900 MHz, 2G Bands: GSM 1800 / 1900 / 850 / 900 MHz, GPRS: Available, EDGE: Available...
3G Bands: UMTS 2100 MHz, 2G Bands: GSM 1800 / 900 MHz, GPRS: Available, EDGE: Available...

SIM 2 Bands

4G Bands: TD-LTE 2300(band 40), FD-LTE 1800(band 3), 3G Bands: UMTS 1900 / 2100 / 850 / 900 MHz, 2G Bands: GSM 1800 / 1900 / 850 / 900 MHz, GPRS: Available, EDGE: Available...
2G Bands: GSM 1800 / 900 MHz...

FM Radio

-
Yes

Weight

160 grams
-

Colors

Midnight Blue, Aqua Green
Black

Dimensions

147.5 x 71.8 x 9.3 mm
-

SAR Value

Head: 0.807 W/kg, Body: 1.152 W/kg
-

OIS

No
-

Rear Flash

Yes, LED Flash
LED Flash

Rear Camera Features

Digital Zoom
Digital Zoom

Rear Camera Setup

Single, 8MP
Single, 3.2MP

Rear Camera 1 Resolution

8 MP
3.2 MP

Rear Camera 1 Type

Primary Camera
Primary Camera

Front Camera Setup

Single, 5MP
Single, 1.3MP

Front Camera 1 Resolution

5 MP
1.3 MP

Front Camera 1 Type

Primary Camera
Primary Camera

Front Flash

Yes, LED Flash
-

Fingerprint Scanner

No
No

Face Unlock

Yes
-

You May Also Read

Vivo Mobile Price List
Xiaomi Mobile Price List
New Upcoming Mobile Phones June 2023
Best Mobile Phones Under 50000
Best Mobile Phones Under 45000

Recent News

The First Public iOS 26 Beta Version Set To Launch In Few Weeks
8th Jul 2025
Oppo Find N6 Foldable Phone Set For Q1 2026 Release
7th Jul 2025
BSNL Affordable Plans: Get Unlimited Calling And Data From Just Rs 99
7th Jul 2025
Honor X9c Launches With A Monster 6,600mAh Battery At This Price
7th Jul 2025
Vivo X200 FE And Vivo X Fold 5 Ready For Sale: Amazon Microsite Goes Live
7th Jul 2025

Tips & Tricks

Best Camera Settings For Oppo Reno14: Tips & Tricks Inside
4th Jul 2025
Nothing Phone 3a Camera Settings: Capture Like A Pro
2nd Jul 2025
How To Make Your X (Twitter) Account Private: Full Guide [2025]
27th Jun 2025
Facing iOS 26 Heating Issues? Here Is What You Should Do
13th Jun 2025
How to Downgrade from iOS 26 to iOS 18: Complete Step-by-Step Guide
11th Jun 2025

Popular Leaks

POCO F7 Specs Leak, Will Launch With 7000mAh Battery
12th Jan 2025
iQOO and POCO to Enter Offline Market in India; Here’s When
23rd Nov 2021
OPPO Reno 14 Pro Leaks: New Design, Camera Details And Launch Hints
10th Apr 2025
OnePlus Nord 5 And Nord CE 5 Launch Leaks: Launch Timeframe, Specs
8th Jun 2025
Here’s How You Can Claim OnePlus 3, 3T, 5, 5T, 6, 6T Free Battery Replacement Offer in India
27th Aug 2021