e-catalogHD is a new advertisement platform running under iPad. e-catalogHD is a app that can help the customer to preview and verify their design in the ecatalog service website. This application is suitable for those who want to have their own iPad App to promote their products or ideas. The ecatalog service allows the customers to customize the details of the iPad App without the needs to resubmit their iPad App again and again which is a very time consuming task.