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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.
The infrastructure work that we did allows us to share significant business logic and components between iOS, Android, and the web, but each platform is entirely native (i.e. we don’t use something like Cordova or similar, to run the same app on multiple different platforms). This lets us tailor the experience to best suit each platform individually while still accelerating development, but it does also mean that the apps are not quite identical.