What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
At JotForm, we want to make sure that you’re getting the online form builder help that you need. Our friendly customer support team is available 24/7.
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.
Please review also the user guide about limiting submission base on Unique Question on the form.
According to the description on the Unique Question option...
"Do not allow previously entered values."
What it does is, it allows having only a unique answer (no the same answer) on a specific question/field on the form.
Example, if you want to prevent having duplicated email address info from the end-users, you will set the E-mail field as the Unique Question.
This should result into having no similar email address data from the entire submissions the form will have.
Let us know if you need further assistance.
Makes sense. Thanks Jonathan.