I have a lot of respect for Lingvist and am glad you are putting the work in.
I know you have a lot to do so I will keep it down to one request for improvement:
- the ability to choose a particular word that we want to practice. Example I want to pratice the word 'benommen' in german. Lingvist would search sentences in the DB that contains that verb, and put them at the top of my training list.
I will happily pay for lingvist when these sort of learning efficiencies are enabled. for now the price is too high for the benefits. keep up the good work !