There is something I really appreciate about a service: the way it cares about the design; Lingvist certainly meets the criteria.
I have just started using this service, but it looks really good. I wish there was a feature which is really crucial and would be very distinguishing from the other services:
Short movie clips with subtitles in the target language; thus one can learn far better because when we associate a word with something, the memory of such word becomes more enduring; one is able to understand the pronunciation better and also very importantly, it's good for entertainment.
For example, we can learn English by a 30-second movie clip with English subtitles of a Star Wars movie.
You guys would certainly stand out!