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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.
Whatsapp problem isn't in the algorithm, but their identity resolution (hence their roundabout way of doing their web client: https://github.com/sigalor/whatsapp-web-reveng)
iMessage approach is to treat every conversation as a group chat between all the recipient devices and all of yours. There's another risk here, that Apple doesn't let the end user verify the list of devices the chat is encrypted for.
Which is to say, a perfect E2E experience isn't trivial to design, but you don't have to drop the ball completely.
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