Do you plan the UI first or let AI figure it out?

When vibe coding, it’s tempting to jump straight into building

But if you don’t have a clear idea of how the app should look and work, you can end up changing the same things again and again

Sometimes a simple sketch or a few screenshots can make the whole process easier

You don’t need to plan every detail, but having a clear direction helps

For those who vibe code, do you design the UI first or build first and improve it along the way?