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.
Yes you are free to use JotForm on multiple devices, you can even download our mobile app so you're connected from your mobile device as well, here is the link to our mobile apps:
You can also have opened a session in JotForm in multiple computers without any issue, as far as I know there is not a limit for this.