Fluenvo: Turn any text you're reading into a language lesson

Hey Product Hunt, I'm Ilya, solo builder of Fluenvo. I kept bouncing off language apps that taught from decks of someone else's example sentences - stuff I didn't actually care about. So I built the thing I wanted: paste in a text, article, video transcript, or song you're genuinely interested in, and Fluenvo turns it into a full lesson - grammar, vocabulary, comprehension exercises - built from that exact content, not a script. It tracks what you keep getting wrong and brings it back, explains mistakes with context instead of just marking them red, and saves new words into spaced repetition. Built for intermediate/advanced learners, English and Spanish - not another beginner app. One honest note upfront: there's no free trial. Running AI analysis on your own material costs real money on my end, and as a bootstrapped solo dev with no investors, I can't subsidize that for free accounts the way funded apps can. Pricing is pay-per-analysis or a flat Premium tier - I'd rather say that plainly than pretend otherwise. Would genuinely love your feedback, especially: do the exercises feel useful, or like busywork? And is "intermediate/advanced only" the right scope, or too narrow?