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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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Place the embed code on a popup plugin on WPAsked by pickupchange on February 21, 2016 at 05:45 AM
Is it gonna work the same?
Yes, you can give it a try. Here's how to take your form source code http://www.jotform.com/help/104-How-to-get-the-Full-Source-Code-of-your-Form.
You can also try it with iframe embed code instead of the default script embed. http://www.jotform.com/help/148-Getting-the-Form-iFrame-Code. Since the form will load in iframe container, there's a higher chance that this would work out since the form will not conflict anything on your page particularly on the pop-up plugin.
If you are still having difficulties, please provide us a test page where we can check the embedded form so can inspect the problem here.