FlexiLingoThe moment you hit a word you don't know, you have about two seconds before you lose the sentence. Reaching for a dictionary costs more than that, so most people just let it go — and let it go again the next time.
Every word in the transcript is tappable. Tap it and you get the meaning, how it's pronounced, its CEFR level, and a button that turns it into a flashcard. Each word is already underlined in its level's colour, so you can see which ones are worth your attention before you even tap.