Top Flutter Dropdown packages Dropdown is a UI element that is similar to a list box, and allows the user to choose one value from a list. When a dropdown is closed, it has a message which informs the user to select an item or shows the item which has been already selected. When the dropdown is opened, the list of items appears and the user can then select one or many (depending on use case) of the items on the list. The following Flutter packages can be used to add a Dropdown, Dropdown Search or Searchable Dropdown to your app.