I would suggest presenting words then testing on them - as otherwise the chances of a user stumbling across a word they know is very slim. Having to go through the entire course (it seems like?) to possibly see a word again means it does a poor job of teaching new words. This is where copying other SRS programs like Anki or Memrise might come into play, but you'd have to sell people on more than what Anki/Memrise offers.
A few minor nitpicks:
1. Allow a short trial use to funnel into signing up for an account, no need to track the not well/well/good for users who aren't signed in - but they can still "test" on cards.
2. If a user gets an error the styles get a little ugly on the signup form
3. The Getty Image embeds are probably meant to help as mnemonics but I found them distracting and often quite unrelated to the word being presented
4. The Edit Profile page doesn't exist
[1] For those who want to test. email: no@mailinator.com password: noidont
[2] https://i.imgur.com/xyAGlO8.png
About your first comment (words you know not coming back often enough) I think it's because most of the datasets I've added are too large. For Hebrew (which is the language I'm trying to learn at the moment - and why I made this website in the first place) there are smaller libraries with 30-50 words and the experience is much better. One thing I can do in the future is add ways to select smaller subsets of a dataset of just a few dozen words and just "play" with those.
1. I agree, I just implemented that 2. I had not noticed that, thanks, will improve 3. Yeah that's a tough one. It works ok for some nouns and not great for some other words / prepositions / adjectives. I plan to build something on top of it where users can say if pictures are not relevant / not helping, or they can vote on good pictures, perhaps upload or create another mnemonic. Perhaps adding exemples of sentences in context could help as well. 4. Just fixed it!
