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.
If you are referring to the form builder/editor, it is best to open it on a Mac or PC using the latest browsers.
If you are referring to our online forms created using the form builder, you or your users can fill it out as long as the device (PC, Mac or mobile phones) has a web browser and is connected to the internet. We do recommend using the latest browsers but it should still work on earlier versions as long as it is stable. Example, if you try to open the form on an Internet Explorer 7 which is quite an old version, that might cause some loading problems. Basically, there's no restrictions on the browsers aside from the versions of it.
I hope that helps.