Looking for free landing page builder that doesn't require card details

I'm running a workshop for early-stage founders to help them understand landing pages, and what makes a good one. It will be hands on, and I'll be getting them to create their own in the workshop. So I need something they can quickly sign up for in the workshop itself without having to jump through any hoops. It doesn't need to be free to publish, just not need CC details to be able to create a draft. If they choose to pay and publish afterwards, that's up to them. I've looked around, but can't find anything that fits the bill.