We don't specifically collect data about you, but your IP address could be saved in the logs of our web server on certain occasions. We don't sell your data to anyone.
FreelanceStation does currency conversion when you create a Project with a different currency than the one configured in your Activity. At that time, it will request the conversion using our own proxy to Currency Conversion service providers. That proxy is our web server, so any requests against it will be logged. The information logged is usually the public IP address of your Mac.