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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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How can I avoid multiple submissons from the same person on a form?Asked by Sjur Ove on April 01, 2015 at 06:50 AM
When making survey i do not want many answers from the same user. Can I aviod that?
Is it possible to let IP-adresses follow the answer?
Yes it's possible to restrict your users to only one submission.
Please see this guide here http://www.jotform.com/help/64-How-to-Set-Unique-Submissions-on-a-Form and change your Unique Submissions to "Strict" which is IP-based to prevent that problem.
Alternatively, you could even base it on a form field via a Unique Question as mentioned in this guide here http://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question.