This tool help you to search-engine-optimize an app on Google Play. It prints the ranking of the package for the specified keywords.
Specify package name and language code. Keywords come after that.
$ android-search-ranking -pkg com.gmail.anolivetree -lang en "shrink" "photo resize"
#2 for shrink
#20 for photo resize
This output means it's #2 in the ranking for the keyword "shrink", #20 for "photo resize".