Function by Color is an add-on for Google Sheets that allows users to sum and count cells based on their color, either font color or background color. It provides various calculation options, including counting cells by a single color, counting all colored cells in a range, and calculating values in each row or column.
The add-on also recognizes existing formulas and allows users to edit and update them quickly. It offers additional features such as pattern colors, result filling, and extra built-in functions. Function by Color is designed to enhance productivity and simplify data analysis tasks in Google Sheets.