
| Flex 3 | Flex 4 Flash Builder 4 | |
| SDK Code Name | Moxie | Gumbo |
| Compiler | Poor performance than Flex4 compiler | Iimproved compiler performance upto 25% more. |
| Packages available | com flash mx adobe |
com flash mx spark flashX |
| Flash Player | Some features of flash player 10 are not supported.i.e Graphical | Supports all features of flash player 10 |
| States | Complexto use states syntax diffcult to use | States are now easier to use with simplified syntax |
| Namespace URI | http://www.adobe.com/2006/mxml | http://ns.adobe.com/mxml/2009 Library http://ns.adobe.com/flex/spark http://ns.adobe.com/flex/halo |
| Components | Halo Components | Supports both Halo and Spark Components |
| Components Skinning Enhancements | Design and behaviour of component is included inside and integrated. | Design and behaviour is clearily separated to create a smooth workflow among designing and development. |
| Text engine | NA | New text engine supports Bidirectional text, vertical text and over 30 writing systems including Arabic, Hebrew, Chinese, Japanese, Korean etc. Standard keyboard and mouse gestures for editing. New text classes (RichText, SimpleText, etc) |
| FXG Support | NA | FXG is a declarative graphics format, it enables portability of assets between tools. Assets created in Catalyst or CS4 Illustrator can be used without modifying. |
| Layout Model | NA | Layout containers like HBox and Vbox are not required. Instead Group class can be used to accomplish the purpose. |
| Adobe Catalyst | Adobe Catalyst not supported | Support and integration with Adobe Catalyst which is Adobe's new designer tool for creating rich Internet application assets without need of writing code. |
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