Eggplant Functional, stylized as eggPlant Functional, is a black-box GUI test automation tool, originally developed by Redstone Software starting in 2002. Redstone was acquired on 2 September 2008 by a UK-based company called TestPlant.Its approach uses image matching technology as opposed to looking to the object-level of the application being tested. This allows for system-wide automation of a system-under-test as opposed to an application-specific solution.