What is "earmaster"

EarMaster is a music software launched in 1996 by Danish editor Miditec, who changed its name to EarMaster ApS in 2005. The first prototype version of the software was DOS-based, but since 1996, it has continuously evolved with the Microsoft Windows OS. In November 2008, EarMaster became multi-platform with the release of a version for Mac OS X. The main focus of EarMaster is ear training, even though EarMaster seems to tend towards a more general approach to music teaching since v. 4.0, covering a broader spectrum of music theory and practice. Three editions of EarMaster exist: Earmaster Essential, EarMaster Pro (standard version), and EarMaster School (educational version).