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by ThinkingGuy 1769 days ago
The closest thing you're probably going to find for languages is the Pimsleur method, which is also based on a specific formula of spaced repetition. I don't know how effective it would be for trying to achieve true conversational fluency, but I've found it very effective for quickly learning a basic set of words and phrases for a trip to another country.

https://www.pimsleur.com/