I’ve been using the memories app for ages now with a couple different languages and I really like it. One weakness it has is that it doesn’t integrate well into study of a language as a whole because the structure of a course is so rigid. With some courses the structure is important, but “3000 most common words” for example has no essential order of learning. If you could search words within a course you’re taking and “queue” them so they skip ahead to the next learning set, then the app would harmonise better with other learning tools and day to day vocabulary learning. Would be great to see this feature added in some time 
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