Which online form editor and database for the site to choose?

Question

Database

Interested in something more or less simple, especially for not very sophisticated users, like MyTaskHelper, jotForm, etc. With an iframe form code, for later embedding.
Who will advise what?
Of course, I would like the most inexpensive option, but at the same time it allows you to create forms with conditions, send out emails, provide access to the database, make many entries and have more than 5 (or even 50) forms.
Thank you.