Cool app!

Unfortunately, I'm not sure how useful it would be for language learning. I've been using the Fluent Forever approach and whenever I've dipped back into "translation" style methods like Duolingo it feels counterproductive, like I'm tying English words to Spanish words rather than creating a direct connection between the Spanish word and the object or concept that it represents.

I like the idea of subtitles in your target language while watching a show or movie in your target language but that's usually available without third party help.