I couldn't access it as it is geo-restricted. If you have not already, I would recommend reading about Andy Matushak's work he has a lot of interesting ideas around flashcards, spaced repetition, and tools for thought/learning.
Okay, thank you! I'll check it out. By the way, what country are you located in? I’m gradually adding new countries based on user demand to simplify sales tax compliance, so I'd be happy to add it.