I just recently finished iKnow’s 6000 vocabulary course after a couple years. Pretty decent program, but woefully limited at higher levels. To be honest, I don’t think it’s worth the asking price after the beginner levels. I’ve also used and continued with Anki which is what i’m sure most people here are using. I love the customization and flexibility.
Still, I know there have been some premium vocabulary focused apps and programs I’m sure. Despite trying different sets of grammar flashcards in Anki over the years, nothing has matched the quality and content that Bunpro has offered. Wondering if there is a vocab equivalent.