Any recommendations for product launch waitlists?

I'm creating a pre-launch waitlist for a new product we're about to roll out, where interested users can sign up, and refer other users to move up on the waitlist. For reference, Robinhood has done this for almost every product launch.

Are there any good existing tools that allow you to do this? If possible, I'm looking for one where I can embed within my existing website.

I've narrowed it down to prefinery and upviral, but wondering if there are any better (and more affordable) options out there.

If not, I know what my next project will be.