Google Ad Planner will also provide a more accurate traffic picture of your competitor's site. This tool is used with the "begin research tab" which you will use to search the URLs of your competitor's sites. The result is a detailed traffic breakdown on the URL that you entered.
why do you need the exact numbers?? there are great free tools like Google Ad Planner. besides that, there are few things that you have to pay them but they are really complicated to work with