Just a friendly heads up, for the Japanese exercises the video starts just a bit too late and the word you're listening for is cut off. This might only be pertinent for languages where vocab words are appearing at the beginning of sentences, French and Spanish didn't have "gap words" at their sentence start for the few exercises I tried.

This is a cool app, I would have enjoyed this when I was grinding on Japanese back in the day.

Great idea, nice proof of concept. It'd be nice to see a translation into English after we finish the sentence, as it'll inevitably introduce words I don't known yet, and there's a learning opportunity.

My biggest complaint about Duolingo is the lack of feedback about how to improve. There are several words whose pronunciations I think I correctly have but the app doesn't understand my pronunciations ever. There are also some words whose dictionary translations aren't provided or are used differently than the translation help offers. Without feedback to ask questions and get answers it's very frustrating.

The few UX things can make for a really frustrating experience. You don’t want to push away your users in their first testing.

1. Change the word “gaps” to “blanks” for English audiences. It fits the common phrase “fill in the blanks” better. And maybe call it that too.

2. Don’t make the blocks move around for the drag and drop. It makes for a frustratingly slow process to find where the word you were about to grab moved to.

3. Don’t just correct a wrong answer, show what the user chose. I had too many moments where I was convinced the answer was what I had selected. Even using the red/green doesn’t quite make sense if you’ve replaced an incorrect answer with a now correct answer.

3. Consider doing the check after all words have been dropped in so they can read the sentence as a whole. And thus give them the chance to change their word choice.

This looks great! A humble request: a more button that I can press to sign up for an email when a language I seek gets added.

Lovely idea and implementation, Waiting for Slavic languages.

Super cool that you've got Dutch as well! I make https://hetnederlands.com, would be happy to do a link exchange or something like that. Feel free to get in touch lars@hetnederlands.com

Nice, tried it. Looks cool. On the phone the drag and drop is a bit tricky. Dropped a wrong word and it got score emediatly as wrong, even though I was going to fix it. I expected scoring to happen after I click "submit". But maybe that's the same in Duolingo, no idea.

Would love to see a way to understand the english equivalent of each word. As it stands now you aren't really expanding your vocab if you are just listening and copying what they say without knowing the word's meaning.

first screen is 'Select a language' - maybe good to make clear if that's your own language, or your target learning language