The terms User Experience (UX) and User Interface (UI) have become inadvertently misused in the design community. The user interface is not the same thing as the user experience. This confusion most likely stems from the overlap of the skill-sets and tools involved in both disciplines.
Off-page optimization is defined as the technique which helps the website to improve its ranking on the search engine results page. These factors function outside the boundaries of the web pages. These ranking factors are not directly controlled by the publisher. Off-page optimization basically deals in link building for SEO.
We are offering development in native IOS (Swift) platform, to build apps for both Android and iOS, you will have to come up with a separate app. If you want to develop an application for Apple products like Mac OS, iOS, and apple watch then you should contact us.