[Idea Feedback] A tool for validating ideas

Often we have (great) ideas and we need to validate and test them. I'm wondering if it will be needed:

A simple tool for creating one-page landing pages from the box. A user picks a suitable image (or uploads their own), picks a suitable font + colours, and adds texts. Also, there will be a form for collecting emails and names.

That's all.

One idea to validate - one subdomain. So, the creator will be able to get potential users by collecting their email using the landing page and the form.