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I just published an app but I was wondering if there is any type of app ranking software or some blackhat methods to rank my app on the Google Play Store

Best bet is to buy installs. Depending on your niche you might need a lot. It can get very expensive.

Thanks. Reps added for your replie

Has anyone ever used a site called rank app? To buy installs. I guess installs and reviews are supposed to help your ranking