Kanju live
A web app for Mandarin learners that answers one question: what do I need to learn to watch this show? Import the words you know from Anki, drop in a show’s subtitles, and it shows how much of each episode you’d understand and which words to learn first.
It also drafts flashcards from the show’s own sentences and tracks your progress. Everything runs in the browser, with no account and nothing sent to a server.