FounderBrief's demo turns a startup idea into a product requirements document and a build plan before you write code. Describe the product in plain language, then answer a few questions about who it is for, which platforms it runs on, how people sign in, and what it must integrate with. Those answers are what change the scope.

You get a PRD a builder can start from: a short summary, goals and non-goals, user stories, functional requirements, the core experience, success metrics, technical constraints, and a phased plan with milestones. The point is to show what the first version is, and what it is not, so the first stretch of work stays small enough to finish. Read it as a draft you will cut, not as a promise to build every line.

The first generation is free and does not ask for a card. Delete anything you cannot defend, then open an editor or send the plan to the person who will build it. Paid plans add unlimited generations, shareable links, and PDF export when the document needs to leave your machine. The demo does not replace talking to a real user. It makes the idea specific enough that the conversation, and the build, can start.