Do you know of a commercial Form Builder w/ Conditions & Drag and Drop features like Google Forms, Typeform, Formstack?

I'm looking for a form builder like Typeform, Formstack, Google Forms, etc. Ideally, it will have a drag/drop interface and support conditional fields.

I'd like to embed the designer interface into my app and store the generated JSON.

The closest thing I found was [https://surveyjs.io](https://surveyjs.io/)

Does anyone know of anything? I'd spend some $$ if I found something decent.