Got it, thanks!
There is a chance that our Form Builder app might partially cover your use case.
Here you can create a multistep form, placing each question to a separate page and finally displaying a sign-up page:
However, our app doesn’t have a password field which is crucial for the sign-up. You can vote for this idea in the Wishlist - "Password" field type
Anyway, feel free to give it a try and let me know if it worked for you 