First of all, I really love the idea of Lingvist, and I really wish I had it when I was FIRST learning French. I think an app that teaches you the most useful 5,000 vocabulary words in a language, IN CONTEXT with sentence examples, is fantastic. However, I am not a beginner and before I found Lingvist I have been using two big (5,000+ each) French noun and verb courses on Memrise. I don't like the interface of Memrise very much, but after trying out Lingvist I think I will return to Memrise. Here's why, and hopefully this might help you improve Lingvist for Intermediate learners like me:
I took the placement test and tested around 40%, ~250 words. I started learning and I have already learned, by heart, literally every single word it is giving me. I'm filling in things like "man" and "woman"! I think there needs to be an easy option to re-take the placement test without making a new account (I don't like wasting time), but to be honest, I really don't like the idea of a placement test in general. For intermediate learners, I think it'd be best to, along with the placement test, be given the option to see a big list of words and mark what you do and don't already know. Or, every time a known word shows up in Learn, instead of having to type in "woman" and being marked correct and having the card show up later in spaced-repetition (that's how it works, right?) I should be able to mark that I already know the word by heart and that I never want to see it again.
As an intermediate learner, I just don't like the idea of a placement test being my only option. If I test into a high level, what if there are lower-level words that I miss out on? If I test into a low level, I will spend time filling in words like "man" and "woman." In Memrise I am able to Ignore any word that I already know as soon as it is presented to me in the course, and I'm able to see the entire course's list of words and mark off words I want to Ignore all at once. That's what's effective and efficient for learners who aren't complete beginners.
I really like the way Lingvist presents words in sentences, however, there have been several sentences in the French course that do NOT include the article of a noun. In cases such as this, I would have to go to a separate French dictionary website, look up the word, and learn the article. And then hope I never forget it, because Lingvist's sentence won't test me for it. Articles are very important in romance languages. I know it's a pain to re-do extant sentences, but in the future for romance languages I think it's important to make sure every noun has its article in the example sentence. In Memrise, I learn the "un/une" article along with every word, and I'm tested every time for the article.
This last one is a minor thing, but it makes a significant difference when you're typing a ton of words in a romance language with an English keyboard. Special characters such as é , ô , etc. Need to be on-screen at all times. I shouldn't have to click a button to open the on-screen keyboard, press the character, and then press the button again to close the keyboard. The characters should just be displayed near the bottom of the sentence or the screen. This is how it is in Memrise, and even though it's such a minor thing, it really does make things MUCH more efficient and less time-consuming.
These are the reasons I will continue using Memrise to learn my French vocabulary despite the fact that I don't like the interface and I have some problems with the Memrise system. Despite the problems, it simply meets me needs much better as an Intermediate learner. However, if I ever want to learn a new language from scratch, I WILL come back to Lingvist. And when you release the French video/audio content, I will definitely check that out.
Keep up the good work guys, and thanks for reading these suggestions. Right now your app is amazing for complete beginners - I'm just telling you how you might want to change things in the future to better accommodate those at different levels.