This is very special for blogger because it is not a tool but a plugin for WordPress. With the help of this you can see your mistakes inside the word press. It has many features like you can see spelling mistake, you can check grammar. When there is a spelling mistake, there comes a line of red color. Green color line comes when there is a grammar mistake. And the line of Blue Color comes for Style Suggestion. This tool is not completely free. If you are thinking of using it then you have to buy its plan to use it.