e3KWD Check is a lightweight, fast and free SEO (search engine optimisation) tool for analyzing keyword density within web and text documents.
It has been written for all Windows platforms. This tool allows you to run real time keyword density analysis tasks upon your local copy while writing or editing.
If you have an active internet connection it will also retrieve and analyse online web documents using the built-in address bar. Other key benefits are the ease of use and the small size of the interface.