A search interface and searching technology for interactive search refinement based on feature similarity (ISRFS), which provides an interactive search tool based on human associative and semantic knowledge. Given a query, the tool may retrieve the most suitable textual items in a repository of textual data that is categorized or/and partially tagged. In the user interface, an equalizer controller may be used to refine the search results, for example, based on manually or automatically extracted features and a graded semantic scale to adjust the weights of the various features. The technology may be applied to any data repository.