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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
We're different; First of all, our entire platform is open source. This allows you to simply fork our GitHub repository and start competing with us. And even though we'd love to see others doing that, it's simply too difficult for most to do. Building your own Kubernetes cluster, creating your own shop with Stripe integrations to charge clients, and making sure everything is up running, simply requires too much effort for most - So most people chose not to do it.