I developed this one a few years ago... it does have an advanced feature, though many websites are just using it for the simple fact that it's a counter. Doesn't use any cookies.
Love the simple design. Is there a way to have private data though?
The data is only viewable by you. As for hiding the counter, there's an option to set the image to display: none. Then just grab the ID of the counter and navigate to the bottom of the page, where you can click on "count" and get your tracking data right there if the counter isn't visible on your website.