Just as you say, we're using "sales data to train machine learning algorithms" - and then we display these estimates for your app categories. Some larger shops

Just as you say, we're using "sales data to train machine learning algorithms" - and then we display these estimates for your app categories. Some larger shops instead use App Theta with their private data. That's our basic business model - use it for free, or pay to keep your sales out of the public training data, while still using the system. Also, please check out this FAQ: http://apptheta.com/faq/ http://apptheta.com/faq/ - we'd love to have comments on how we talk about the service.