KeyLemon is a security tool that has been designed and developed by an entity of the same name. You can use this tool to securely login into your computer and prevent unauthorized access, as it logs you in using face recognition technology. Besides during the login time, the tool can also be configured to execute regular checks during computer usage to ensure it is a valid user at the console. The tool is simple to install and implement, and the wizard feature guides you through the user profile creation process. Supported in various Windows systems such as Windows 7, XP, and Vista versions; you can avail this tool as a free to try software application with certain limitations with regards to its features.