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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.
Maybe proof of work based captchas will be a viable alternative, like https://github.com/mCaptcha/mCaptcha:
> mCaptcha makes interacting with websites (computationally) expensive for the user. A well-behaving user will experience a slight delay (no delay when under moderate load to 2s when under attack; PoW difficulty is variable) but if someone wants to hammer your site, they will have to do more work to send requests than your server will have to do to respond to their request.
The screenshot here shows 117H/s, and I guess the Android version hasn’t been as heavily optimized: https://github.com/XMRig-for-Android/xmrig-for-android
I think we‘d need to compare apples to apples, and not use Monero mining as a benchmark for mCaptcha. Also, as I wrote in another comment, the average case (server is not under attack) is 0.02 seconds on a laptop, and probably 0.4s on an Android device if we use xmrig-android as comparison.