## Welcome to Ext JS 5.1!

Ext JS 5.1 is a pure JavaScript application framework that works everywhere from IE8 to the latest Chrome. It enables you to create the best cross-platform applications using nothing but a browser, and has a phenomenal API.

View the Examples Discuss Ext JS on the forum

### What’s New

Check out our new features and changes in the What's New Guide:

- Spreadsheet Selection Model
- 3D Bar and Column Charts
- Advanced Color Picker
- Rating Widget
- Core Unification

Guides

API Docs

Release Notes

Learn more on sencha.com

### Upgrading

Check out our upgrade guides to see what has changed.

- Ext JS 5 Upgrade Guide

Sencha also offers training courses and professional services for companies wishing to use Ext JS 5.