Can custom functions be used for conditional formatting?

Custom functions can be used for conditional formatting in Google Sheets, making it possible to create complex and tailored formatting rules based on specific criteria defined in the function. This feature allows users to create unique conditions that go beyond the built-in options provided in the conditional formatting menu.

By using a custom function, you can leverage sophisticated logic, calculations, or data retrieval that the basic functions may not offer, enabling more precise control over how cells are visually represented when they meet certain conditions. This is particularly useful for users who want to automate data visualization based on specific metrics or thresholds that do not fit the standard conditional formatting options.

For instance, if you want to highlight cells based on a unique calculation or establish a condition involving multiple cells and external data, a custom function is the most effective tool. This extensibility is one of the advantages of using Google Sheets for data management and analysis.