Does this actually look at my footage and suggest grades, or do I describe what I shot?
You describe your footage — camera, lighting conditions, the mood you want, reference images or films — and it builds grade recommendations from that information. It can't visually analyze your video files, which is the biggest limitation compared to tools like Colourlab or the DaVinci Resolve auto-color feature. The value is in the creative guidance: it helps you articulate and achieve a specific look rather than just guessing at LUTs and hoping for the best.