Fructaan, a substance found in grass, can cause laminitis in horses. Fructaan Index is a free Android app developed by Holomarcus Web Development that provides information about the fructaanindex of several Dutch and Belgian places. The app helps horse owners decide whether it is safe for their horses to graze in a specific location.

The app's interface is straightforward and easy to navigate. Users can select a location from the list of available cities and view the fructaanindex. The app also provides a brief explanation of what fructaan is and how it can affect horses. Fructaan Index is a useful tool for horse owners who want to ensure that their horses are safe and healthy.