Phosphor is a spaced repetition app for people who study from lectures. Paste a YouTube link, type a topic, or paste notes you already have. It writes a summary and notes, then builds flashcards from them, and each video card links to the second it came from. Cards are scheduled with FSRS, so each one comes back on the day it starts to fade. Export any deck to Anki. Free to start; Pro lifts the limits.