This reminds me of a learning resource that I can't find again: you start with an assessment of how many words you know and then you get new words in context with every session (and maybe some spaces repetition). It was mostly from newspaper articles and catered for every level of English. It was a website (ca 2013), not an app. Any ideas?

“You mastered 98 new words! THE VERDICT

You are a person of few words, or perhaps just a mysterious one. Quite intriguing.”

—- This sounds more like a cute assessment of only getting two words right. And what do you mean “new words”? It wasn’t until eighty-odd words in that I actually got a word I didn’t know and had to guess by ruling out multiple-choice options.

I wish the option was just “yes I know this word” or “no I don’t”. Reading the definitions takes too long for so many words

Funny that lots of words can be guessed correctly if one knows a few European languages. I speak Dutch, German, Russian, English and was able to recognize most of the words without ever using it in English. For example Seldom. It's very similar to Zelden in Dutch. I would never use the word Seldom though.

I did 81/100 (not my first language) but I probably only knew 60 from before. But I speak other languages and so I can usually decode an origin of a word or I have seen other words in English or another language.

So it’s not a test of how many words you know but how good you are at guessing what words mean.

The wrong answers were generated by AI, and for nearly every entry 2 could be eliminated, so even a monkey can get 50% right.

Improve the wrong answers to be closer to the correct answer, to test the subject’s mastery.

Anyone who has practiced standardized tests would do well on this, even with poor vocab.

Also, too many Britishisms

Pretty bad that there is no option of "I don't know". A couple of times I tried to guess the wrong word on purpose when I knew I had no clue what the word meant and accidentally got the right answer. I'd expect that admitting ignorance would be an option in such an app...

What I read long ago in a book on English:

TV vocabulary is targeted at 6th grade reading level.

Conversational English is about 2,000 words.

High school vocabulary is about 10,000 words.

College degree vocabulary is about 30,000 words

English has over a million words.

Which heartens me, because it means I can be "fluent" in another language by learning just 2,000 words.

Fun idea, I've been wanting to create something similar to track which vocab words I have mastered. Two nits: (1) no need for a "check" button as other commenters have noted and (2) the UI jitters a bit when submitting answers for each question - it's a bit disorienting!