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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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I've verified it on my end, and it does seem that the app is not currently launching I do see a ticket is already open in regards to this. And this may due to the app not being ready as of yet.
Nevertheless, I will go ahead and raise a ticket in regards to your concern. Once the Development Team has an update, they will let us know through this thread. Thank you.