Sebastian is an ear training tutor that gradually increases in difficulty.
Many music students struggle with ear training, though it is a critical skill for musical development. The most effective learning method is one-on-one instruction with a tutor, at the piano. But ear training is a technical skill; the main thing the human tutor provides in this area is a stream of problems, adjusting to the student's proficiency. Sebastian gives the same kind of tutoring: gradually increasing problem difficulty and trying different types of problems as you get better.
What's new in Sebastian
Version 100.0 (1.6):
Note: While MacUpdate Desktop and Finder report the version number as 100.0, the dev states it is 1.6.