Sencha Sencha is a web development company, specializing in UI frameworks and components in Javascript and other platforms. Company's most well known products are Ext JS and Sencha Touch.

Before Ext JS creating a multi-window complex user interface in a web browser was an immensely difficult task. Several companies had separate components (such as Data Grid), but they were either too slow or could not be easily combined into a complete, working interface.

Ext JS combined most typically used UI components in a single, unified UI framework and separated presentation and data layers within UI code. As such it became possible to change presentation and data independently of each other, and easily replace one component with another.