WeForms was similar to what I was looking for some time ago.
I had Gravity Forms installed with a number of forms being used but the licence ran out as I felt the payment each renewal was prohibitive.

To my surprise, WeForms asked if I’d like to convert all my forms from Gravity Forms to WeFroms to which I agreed.

Everything works fine, there’s a ton of addons and clever features … all for a one-time payment.

The online user guide is also very comprehensive so, no getting lost, either.

I’m not complaining here, this is what I call a good deal.