What is Difference between Android ICS and Jellybean?

Google has retooled Android to be even more responsive, so that it ramps up whatever power lies within the moment a finger touches the screen. The goal here is to achieve 60 frames per second across the board on modern hardware; that could mean bad news for older devices that may or may not get the update, but phones like the Galaxy Nexus seem to gain horsepower simply due to coding improvements.

One of the main features of the new Google's OS is Project Butter, an improved performance and response time compared with precedent versions, more clear picture, an updated notification system and an enhanced fast search feature with integration of Google Now..

On the home screen now you can do some nice things like dynamically resizing widgets, so you no longer have to place it, on Android 4.1 apps and widgets can be removed by flicking them off the screen, also you can tap the mic and dictate a message even if you are offline.

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Features of ICS: 

• Virtual buttons in the UI, in place of capacitive or physical buttons
• Separation of widgets in a new tab, listed in a similar manner to apps
• Easier-to-create folders, with a drag-and-drop style
• A customizable launcher
• Ability to access apps directly from lock screen
• Ability to shut down apps that are using data in the background
• Built-in photo editor
• Adobe Flash player support

Features of Jelly bean: 

• Vsync timing across all drawing and animation done by the Android framework, including application rendering, touch events, screen composition and display refresh
• Triple buffering in the graphics pipeline
• Enhanced accessibility
• Bi-directional text and other language support
• User-installable keyboard maps
• Expandable notifications
• Automatically re-sizable app widgets
• Bluetooth data transfer for Android Beam
• Offline voice dictation
• Improved voice search
• Improved camera app
• High resolution contact photos
• It does not supports Adobe flash player,
• Uses HTML5 to play flash content 

The overall difference between API Levels 15 and 16 is approximately 2.52%

Type	Additions	Changes	Removels	Total
Packages	4	39	0	43
Classes & Interfaces	55	211	0	266
Constructors	12	22	4	38
Methods	374	151	20	545
Fields	171	46	4	221
Total	616	469	28	1113

Android ICS & Jelly bean looks little similar, Google made Jelly bean more faster and smoother. 

Check the below video by google. Demonstrating the difference between Android Ice-creem Sandwich (4.0) and Android Jelly bean (4.1) on Samsung Galaxy Nexus.

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