JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Unfortunately there is currently no option to see which fields the user left for an uncompleted form. However, you can still use the Form Analytics feature to see the conversion rate of your form, how many people viewed the forms, and where the users came from.
If you want to try out the Form Analytics, simply follow this link: http://www.jotform.com/form-analytics/
Do let us know if you need further assistance.