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Form.io is a good product and useful for many people. We used the premium version and heavily custom components as well. We found a lot of issues with tools and when we brought these issues to the notice of teams they seemed to be not worried about them, especially CEO who only cares if you pay otherwise he is just a weird guy. I would recommend using its open-source version and making your own custom backend for peace of mind. Paid money was hardly any use for us.