## Welcome to Ext JS 4!

Ext JS 4 is a pure JavaScript application framework that works everywhere from IE6 to Chrome 11. It enables you to create the best cross-platform applications using nothing but a browser, and has a phenomenal API.

This is the biggest upgrade we've ever made to Ext JS and we think you're going to love it.

View the Examples Discuss Ext JS 4 on the forum

### What’s New

We have also been posting summaries of new features and changes to our blog:

- Drawing & Charting
- Anatomy of a Model
- Data Package
- Dynamic Loading and the New Class System

Learn more on sencha.com

API Docs

Release Notes

### Upgrading

First, check out our overview guide to see what has changed.

Sencha also offers training courses and professional services for companies wishing to use Ext JS 4.

# SDK Updates

Oct 19 Ext 4.0.7 Released
Aug 30 Ext 4.0.6 Released (support subscribers only)
Jul 24 Ext 4.0.5 Released (support subscribers only)
Jun 29 Ext 4.0.4 Released (support subscribers only)
Jun 14 Ext 4.0.3 Released (support subscribers only)
Jun 9 Ext 4.0.2a Released
May 17 Ext 4.0.1 Released
Apr 26 Ext 4.0.0 Final Released

# Documentation updates

Oct 10 Grid tutorials
Aug 22 JSDuck 3
Jul 14 Favorite classes
Jul 8 Search results pagination
Jun 29 Components Guide
Jun 26 Inline examples
Jun 21 Forms guide
Jun 16 Tree guide updates
Jun 15 Layouts guide
Jun 9 Grid guide updates
Jun 6 Data guide updates
Jun 2 MVC guide updates
May 31 Getting started guide updates