Flex SDK Versions

The Flex SDK was open sourced as of version 3.

Version Last Milestone or Stable Release (download)
Flex 4.6 November 29, 2011
Flex 4.5.1 June 19, 2011
Flex 4.5 May 2, 2011
Flex 4 March 21, 2010
Flex 3 December 11, 2009

Flex 4.6

Flex 4.6 is the next major step in cross-platform mobile application development and offers several new components and functionality specifically designed to help developers create applications for the latest mobile and tablet devices.

Flex 4.5

The 3 primary themes of Flex's next release, code-named, Hero, are:

  • Multi-Screen Development: Allow developers to build applications that target the web, desktop or mobile devices using a single unified framework.
  • Spark Maturation: Polish and grow the Spark architecture by adding new Spark components and capabilities.
  • Large-Application Development: Support developers building large applications by improving fundamental pieces of the Flex infrastructure.

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Flex 4

As of March 21, 2010, Flex 4 has been released. It is has 3 primary themes:

  • Design in Mind: provide a framework meant for continuous collaboration between designer and developer.
  • Developer Productivity: improve compiler performance and add productivity enhancements to language features like data binding
  • Framework Evolution: take advantage of new Flash Player capabilities and add features required by common use-cases

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Flex 3

Flex 3 was initially released on February 25, 2008. It was focused in 4 areas:

  • Designer/Developer workflow: e.g., enhanced constraints, Flex Component Kit for Flash CS3
  • Working with data: e.g., list effects
  • Adobe AIR applications: support in the framework for Adobe AIR features
  • Platform evolution: e.g., persistent framework caching, compiler performance

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