Ask HN: Most advanced online courses (A/B, SM-2, Pricing)?

What is the most advanced online course platform for learning?

- None seem to use A/B testing with users?

- None seem to use SM-2 learning for reviewing? https://www.supermemo.com/en/archives1990-2015/english/ol/sm2

- AI which learns how you learn and modifies teaching style?

- Few seem to assign you a mentor (which could be an old student).

A few seem innovative:

- Duolingo on their pricing

- Lingq on their mixture of reading, and audio learning

- MOOCs on their use of student mentor - correction groups

- udemy in that anyone can become a teacher

What is the most advanced course you have taken? Is anyone pushing the boundaries on teaching tech?