Creators face two problems: you forget what you watch, and you run out of ideas. AI idea tools give generic filler. Analytics tell you what already happened. Note apps become a graveyard you never reopen. Margin connects them. It turns every video you watch into a clean Google Doc notes, timestamps, takeaways then mines your watch history for your next ideas: hooks, titles and angles built for your audience, not generic AI. Built solo, early — honest feedback wanted.