# Flex Vs FlashDevelop?

**URL:** <https://forum.kirupa.com/t/flex-vs-flashdevelop/292783>\
**Category:** flash\
**Created:** [July 19, 2009, 2:23am UTC](https://forum.kirupa.com/t/flex-vs-flashdevelop/292783 "2009-07-19T02:23:09Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tdq](https://avatars.discourse-cdn.com/v4/letter/t/f6c823/32.png) [@tdq](https://forum.kirupa.com/u/tdq)\
**Post date:** [July 19, 2009, 2:23am UTC](https://forum.kirupa.com/t/flex-vs-flashdevelop/292783/1 "2009-07-19T02:23:09Z")

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I’m a total newbie and can’t quite get a handle on what Flex actually is - I’m using FlashDevelop (cos it’s free!) with Flash CS4. Is FlashDevelop basically the opensource version of Flex or is it something completely different again? Or is that what AIR is? Or am I completely off on a tangent?