Flexunits is a free Chrome extension developed by freesmanfreezil that aims to save developers time by providing a convenient way to convert pixel sizes into viewport units in Figma layouts. This add-on is specifically designed for Figma, a popular design tool used by many professionals.

The main feature of Flexunits is its ability to convert the size of elements in pixels into viewport units such as vw (viewport width) and vh (viewport height). This is particularly useful for web developers who need to ensure that the elements in their designs are responsive and adapt well to different screen sizes.

Flexunits offers three pre-configured states: desktop, tablet, and mobile. Developers can easily switch between these states and adjust the width and height settings accordingly. This allows for quick and efficient calculations, eliminating the need for manual conversions.

Overall, Flexunits is a handy tool for developers working with Figma layouts. It simplifies the process of converting pixel sizes to viewport units, saving valuable time and effort. Best of all, it's available for free, making it accessible to anyone in need of this functionality.