You can create a commercial extension to Sencha Ext JS, Sencha GXT, and/or Sencha Touch, if the extension adds substantial value to the product and has substantially different functionality than the product. To use the Sencha Extension License you must register for this license below and comply with all the terms and conditions of this license, including:

• Each developer using your extension must be a commercially licensed user of the applicable Sencha product
• Your extension cannot be a product that can be described as an application builder or a website builder
• Your extension cannot be a product with the same functionality of or potentially competitive with a Sencha product
• You are required to include a “powered by Sencha” logo on all documentation distributed with the Extension and as part of the credits or in the “about” section of the extension
• The End User License Agreement (EULA) for your extension must be submitted to and approved by Sencha