Who Is Who in Socionics is a free Chrome add-on developed by Jānis Elmeris. It falls under the category of Browsers and is classified as an Add-ons & Tools subcategory. This add-on allows users to add socionics types after known names on a web page.

The main feature of Who Is Who in Socionics is its ability to add the corresponding socionics type in parenthesis after each occurrence of a person's name on a page. Users have the flexibility to set the socionics type themselves in the extension's settings. Additionally, the add-on supports loading data from a Facebook poll, which can be combined with manually added people lists.

With Who Is Who in Socionics, users can easily identify the socionics type of individuals mentioned on web pages, providing a convenient way to understand the personality traits associated with each type.