Show HN: Rivermark, a superfast AI graphic design canvas

Rivermark is an AI design tool for creatives that follows voice-led sessions, letting users brainstorm out loud while it makes edits such as bolding headlines, laying out type styles, applying palettes, and generating a story version. It reads dragged-in websites, brand guidelines, or Canva templates to stay on-brand, and can turn a content plan into 50 posts in a chosen style. The makers argue that hands-off AI tools make content look generic, and that AI is better used as a lever for one's own creativity and taste.