Hakken

Most courses bore you for three chapters before teaching you anything new. Hakken interviews you (by text or voice!) about what you already know about a topic and how much time you have. It then writes a course for exactly that. Plus, the lessons speak - any module can be turned into a podcast for the commute. And there's an AI tutor riding along that can adapt the course as you go and answer questions about the content (yes, out loud too!)