This document discusses how Appsleak can help users find profitable niche phrases for apps in app stores. It explains that Appsleak allows users to input a popular phrase of interest, optionally select a language, app store country/type, and Appsleak will return related phrases, monthly search volumes, competition levels, and popularity trends to identify potentially profitable niche phrases with low competition and a high percentage of paid apps. It provides the example of the phrase "gpa calculator" as being identified as a potentially profitable niche.