I checked out your site about the time it was announced on Reddit. I really like the idea although I noticed some problems using it for my target languages (Spanish and Hebrew). For inflected languages like these, you really need a good stemmer/lemmatiser (either one, I'm not an expert, but you get the idea). I haven't tried Readlang recently though, when I do I'll be happy to give you more feedback.

Thanks, yes I'm relying on Google Tranlsate at the moment, but eventually I'd like it to recognize word families and verb conjugations. I use it for Spanish and regularly edit the generated verb flashcards to indicate the correct conjugation.