5 stars: The app is incredible, and I'd say it's one of the best apps to learning foreign languages. Lots of useful functions, like, you may bookmark a word, or several words along with the sentence they've been in. I improved my English, and now I learn French from scratch as an experiment :)
5 stars: wonderful app for learning new languages and words. However, I would suggest that the overall interface needs a critical review as it is often confusing and hard to find the options you are looking for in the settings.
4 stars: I have been looking for an app like this for a very long time. The app is really good, but it can be great. It needs small fixes. I don't know why when I translate words and save them, some words are saved with context but some are not. In some cases I'd like to add the meaning of the word in the language I'm learning, but I can't. If you can address these two things, you'll get five stars from me.
4 stars: I like the app. BUT. The biggest serious problem in the app is very bright and contrast light of ads below the screen. This makes it very difficult to read, this light hits the eyes..!!!
3 stars: I'm currently learning Russian, and the app is great in most aspects except that when I try to play the audio for a paragraph translated into Russian, it still plays the English audio. I've changed all the settings to allow everything to be translated through Google speech services, so I'm not sure why it won't play the Russian audio. Otherwis...