AI Visual Generator: Turn prompts into downloadable AI visuals

Hey Product Hunt 👋 I built this as a lightweight way to create AI-generated visuals without opening a heavy design tool or setting up a full app. The workflow is simple: describe what you want, choose a format like 1:1, 4:5, 9:16, or 1.91:1, and the app generates a HTML/CSS visual that renders instantly on the right. When you like it, download it as a PNG. It runs as a single HTML file, uses your own OpenRouter API key, and lets you enter any model code you want. I made it for indie hackers, creators, marketers, and builders who need quick graphics for launches, posts, ads, thumbnails, and experiments. Would love feedback on the workflow, output quality, and what formats/features you’d want next.