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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.
I'm developing rails for some long time and used nodejs + socket.io configuration for years (and love it as hell). And soon wanna go into rails websockets. I did read bunch about ActionCable pros and cons and I think despite that my projects wont soon scale so much, I will stay on better tech that's Anycable here.
For playing around with ActionCable just using it out-of-the-box is absolutely fine. As you mentioned in a production environment ActionCable becomes strained after ~1k connections (ref) but luckily with the help of anycable-rails the configuration changes required are minimal.