Comcast XFINITY → Re: Bandwidth Monitor for Computers-Suggestions?

This was the first question on my mind as well. But why wouldn't Comcast just add it to subscriber's account information? It seems pretty unfair to people who may be on the high side not to give them a chance to know when to back off. My wife and I both use up bandwidth well beyond the average user but I have no idea whether its close to 250 gigs. I use an apple base station. If anyone knows a good compatible mac or pc application please share any recommendations. At the very least they could email customers if or when they were past 200 gigs so people could reduce use or just accept the over-cap fees. This probably doesn't apply to business accounts right?