Here, you can search for an app and see the keywords that it currently ranks for and the keywords that are shared with your app.

You can basically spy on your competitor, especially check out its metadata and track the ones you think might be useful for you too.

Ranked Keywords module shows you your ranked and paid keywords, allowing you to track them easily.

Keywords by Download module gets the estimated percentage of downloads that each keyword is contributing to the total organic downloads of the selected app and Category Keyword shows you the keywords within the same category of the app you have selected, enabling you to track category based keywords along with the ranking based ones.