Bluetooth vs Wifi

Comparison chart

	Bluetooth	Wifi
Frequency:	2.4 GHz	2.4, 3.6, 5 GHz
Security:	It is less secure	It is more secure
standard:	IEEE802.15	IEEE802.11
Cost:	Low	High
Hardware requirement:	Bluetooth adaptor on all the devices connecting with each other	Wireless adaptors on all the devices of the network, a wireless routerand/or wireless access points
Bandwidth:	Low ( 800 Kbps )	High (11 Mbps )
Specifications authority:	Bluetooth SIG	IEEE, WECA
Year of development:	1994	1991
Primary Devices:	Mobile phones, mouse, keyboards, office and industrial automationdevices	Notebook computers, desktop computers, servers, TV, Latest mobiles.
Ease of Use:	Fairly simple to use. Can be used to connect upto seven devices at a time. It is easy to switch between devices or find and connect to any device.	It is more complex and requires configuration of hardware and software.
Range:	10 meters	100 meters
Power Consumption:	Low	High
Latency:	200ms	150ms
Bit-rate:	2.1Mbps	600 Mbps

CDMA vs GSM

Comparison chart

	CDMA	GSM
Stands for:	Code Division Multiple Access	Global System for Mobile communication
Storage Type:	Internal Memory	SIM (subscriber identity module) Card
Global market share:	25%	75%
Dominance:	Dominant standard in the U.S.	Dominant standard worldwide except the U.S.
Data transfer:	Faster on EVDO platform which is applicable in CDMA only	GPRS is again very slowforward
Network:	There is one physical channel and a special code for every device in the coverage network. Using this code, the signal of the device is multiplexed, and the same physical channel is used to send the signal	Every cell has a corresponding network tower, which serves the mobile phones in that cellular area.

Android vs iOS

Comparison chart

   

	Android	iOS
Company / developer:	Google	Apple Inc.
Programmed in:	C, C++, java	C, C++, Objective-C
OS family:	Linux	OS X
Source model:	Open source	Closed, with open source components.
Open Source:	kernel, ui, and some standard apps	kernel only
Initial release:	September 2008	June 2007
Latest release:	4.2.1 Jelly Bean	6.0.2
Widgets:	Yes	No
Dependent on a PC or a Mac:	No	No
Easy media transfer:	depends on model	with desktop application
Available on:	Many phones and tablets, including Kindle Fire, LG and HTC phones, and the Samsung Nexus.	Apple products, including iPhone, iPod Touch and iPad.
Handset Options:	Thousands like Samsung S2, HTC One X	iPhone, iPad, iPod Touch
Interface:	Touch screen	Touch screen
Customizability:	A lot. Can change almost anything.	Limited unless jailbroken
Call features supported:	Auto-respond	Auto-respond, call-back reminder, do not disturb mode
Messaging:	Gchat	iMessage
Voice commands:	Google Now (on newer versions)	Siri
Maps:	Google Maps	Apple Maps
Internet browsing:	Google Chrome (or Android Browser on older versions)	Safari
Video chat:	Using Gchat	Facetime
App store:	Google Play – 800, 000 apps	Apple app store – 775,000 apps
Market share:	75% of smartphones, 3.7% of tablets in North America (as of Jan'13) and 44.4% of tablets in Japan (as of Jan'13)	14.9% of smartphones, 87% of tablets in North America (as of Jan'13) and 40.1% of tablets in Japan (as of Jan'13)

Android vs iOS

Comparison chart

   

	Android	iOS
Company / developer:	Google	Apple Inc.
Programmed in:	C, C++, java	C, C++, Objective-C
OS family:	Linux	OS X
Source model:	Open source	Closed, with open source components.
Open Source:	kernel, ui, and some standard apps	kernel only
Initial release:	September 2008	June 2007
Latest release:	4.2.1 Jelly Bean	6.0.2
Widgets:	Yes	No
Dependent on a PC or a Mac:	No	No
Easy media transfer:	depends on model	with desktop application
Available on:	Many phones and tablets, including Kindle Fire, LG and HTC phones, and the Samsung Nexus.	Apple products, including iPhone, iPod Touch and iPad.
Handset Options:	Thousands like Samsung S2, HTC One X	iPhone, iPad, iPod Touch
Interface:	Touch screen	Touch screen
Customizability:	A lot. Can change almost anything.	Limited unless jailbroken
Call features supported:	Auto-respond	Auto-respond, call-back reminder, do not disturb mode
Messaging:	Gchat	iMessage
Voice commands:	Google Now (on newer versions)	Siri
Maps:	Google Maps	Apple Maps
Internet browsing:	Google Chrome (or Android Browser on older versions)	Safari
Video chat:	Using Gchat	Facetime
App store:	Google Play – 800, 000 apps	Apple app store – 775,000 apps
Market share:	75% of smartphones, 3.7% of tablets in North America (as of Jan'13) and 44.4% of tablets in Japan (as of Jan'13)	14.9% of smartphones, 87% of tablets in North America (as of Jan'13) and 40.1% of tablets in Japan (as of Jan'13)