I have been working on something very similar for the past year. I first build this prototype with the goal of generating sentences and then analysing the user

I have been working on something very similar for the past year. I first build this prototype with the goal of generating sentences and then analysing the user translation because I wanted a feature to see if the user knows the word even though he misspelled it. http://ling-academy.com/ http://ling-academy.com/ I finished that 3 months ago, received feedback but its just a proof of concept and since then have been building v2 which is very similar to what you have build - the idea is to have users learn vocab and then match them up with fitting text. This v2 is almost done but not deployed yet. I do however plan on going much much further then this. I have been looking for a co-founder who is also invested into e-learning and language learning. Maybe we should team up? Email is: Michael . baumgarn at gmail . com