The Growth column shows your app’s ranking growth since the previous day. It also allows you to display your app’s history for a keyword.
AppTweak provides you with keyword ranking history data as far back as the keyword was first tracked on the platform (by at least one user). If the keyword has just been added to our database, we may have no history to show yet.
Make sure to track all the keywords that matter to you in order to guarantee daily ranking data.
You can also check our ASO blog for more tips on deeper keyword research and analysis