Apple iOS 7 v/s Android KitKat 4.4 v/s Window's 8..

Apple iOS 7 Features

1. iPhone/iPad can read your head

Using iOS 7, the front facing camera can detect head movement to control the phone.  

2. A flash of light for alerts

If you somehow never hear your phone or feel its vibration, this feature could be exactly what you need. LED Flash alerts shine a bright light whenever an alarm goes off on your device. 

3. Shake your phone to undo an email delete

In case you accidently delete a message, you can easily retrieve it again by shaking your iPhone. It will give you the option to undo your selection.

4. Camera burst mode

The camera app on the iOS 7 has been redesigned to take multiple shots at once. Just click and hold the "up" volume button.

5. Siri can read your emails

Siri can read your emails out loud indicating the sender, time, and subject. To access this feature, hold down the home button and just say "read my emails."

Android 4.4 KitKat Features

1. Hangout messaging app

Google Hangouts is now integrated with SMS and MMS and includes instant messaging via Google Talk. 

2. Google Now integration

Users will only need to say "OK Google" while on the home screen to bring up Google Now and do a voice search, get directions, play music, or send a text. It is unclear whether this feature will be available on older devices.

3. Record from your screen

Photo capturing is old news. Android 4.4 KitKat allows you to record a video of your screen and save it as an MP4 file.. 

4. Step-er Counter-er

Android 4.4 KitKat comes with two new composite sensors that detect your steps and tracks your direction. This can be very helpful for the health conscious. 

5. Better cloud printing

You can now print photos, documents, and even web pages from your mobile device or tablet via any printer connected to Google Cloud Print, HP, ePrint printers, and other printing devices with apps in the Google Play Store. 

Android 4.4 KitKat will become available for many devices including Samsung Galaxy S4, Nexus 4, Nexus 7, and Nexus 10. It is unclear whether the OS will be compatiable with LG G2, Xperia Z1, or Moto X.  

Window's 8 Features

1.People Hub

See all your contacts in one place, automatically linked together from all your social networks, so you can easily call, text, IM and more. Plus, create a Room in the People Hub where you can share photos, messages and calendars with other Room members.

2.Kid's Corner

No need for additional parental control settings. Kid's Corner lets you select which apps and games they have access to through their own start screen, while still having fun taking photos, playing games or listening to music. No more worrying about kids sending a text to the wrong person!

3.Driving Mode

With the release of Update 3 in late 2013, pairing a Windows Phone 8 device with a car via Bluetooth now automatically activates "Driving Mode", a specialized UI designed for using a mobile device while driving.

4.Data Sense

Data Sense allows users to set data usage limits based on their individual plan. Data Sense can restrict background data when the user is near their set limit.

5.Pin what matters most

See at-a-glance what's important to you. Pin your favourite people as Live Tiles.Then see their latest profile pic, tweets, posts and updates. Pin music albums, websites, photo albums and more as Live Tiles so you can quickly get to the things you want.

6.Work or Play? No problem

With Office, Outlook, and full device encryption - using your Windows Phone 8 for work or play is a breeze.

Near Field Communications

7.NFC (Near Field Communication)

NFC makes shopping easy! It allows mobile payments by simply tapping your phone on a compatible credit card reader.

	iOS 7	Android KitKat 4.4	Window's 8
Applicaton's	1,001,555+	80,000,000+	775,000+
Customisation	Not provided	Available	Available
Expandable memory	No	Yes	No
Maps	Good	Best	Better
Upgradability	Apple supports products for longer and provides a worldwide over-the-air roll out on launch day.	Some devices never receive any operating system updates while others may receive an update months or even a year after it becomes available for Google’s Nexus line.	Windows 8.1 is Expected to be reveled till April,2014.
Security	Apple vets every app in the App Store and it doesn’t have a problem with malicious content.Apple’s operating system is more secure and has enterprise friendly features.	Google does not vet apps before allowing them into the store.	N\A
Multitasking	Less Flexible but help's conserve battery	More Flexible	"Snap multi tasking" is one of the new feature introduced in Windows 8. The Snap feature allows the user to run multiple apps side by side on single screen.