RevEye is a tool that can be used to perform a search by image. It is a free application and can be downloaded on Google Web Store. The main function of the tool is the ability to perform a search by right-clicking onto any image in a web site. This is a useful function that can be used in any case.

The tool can be configured to use any search engine, but it is recommended to use the search engine that is provided by the tool itself. Most importantly, you don't have to worry about anything else because this is designed for free.