SolarPrism
For pairing with Gemini, v0 by Vercel and Framer AI are both worth trying since they generate actual component code rather than just a picture of a layout, which saves you from re-building everything by hand afterward. If you want a middle step for pure visual direction before touching code, Galileo AI is decent at turning a rough brief into full screen mockups you can then hand off to Gemini for the copy and structure. Worth testing all three on the same page description since they each interpret spacing and hierarchy differently.