mobile phone OS

Users can enjoy full customizability (lock screen, widgets, chaging default apps, etc.) and more than 900,000 apps from Play Store. It is being used by multiple manufacturers.

Threshold: Current Version: Android 4.4 (KitKat)

iOS offers a smooth and intuitive experience on Apple devices with the option of having more than 900,000 apps from iTunes Store

Threshold: Current Version: iOS 7

Windows Phone offers a metro interface with Live tiles providing the required information without even opening an app. However, its app count is dismal against Android/iOS

Threshold: Current Version: WP 8 GDR3

BlackBerry 10 OS has a unique gesture-based interface and comes with Blackberry's enterprise services, BBM, etc. However, its app count is low.

Threshold: Current Version: BB OS 10.2

Samsung's TouchWiz Interface adds features such as Multiview to open two apps simultaneously. Pre-installed Samsung apps: S Voice, Music Hub, S Planner, etc. Galaxy Note devices have S-pen, a stylus for accurate pen-like input.

HTC's Sense has useful features such as BlinkFeed, which shows news & social feed in the homescreen.

Sony has minimal customizations on top of Android. Its Small Apps feature opens small version of apps for easier multitasking.

LG's Optimus UI also provides mini versions of apps for multi-tasking. Quick Memo allows quick annotations on screen directly.