niux

This very likely is against Cloudflare ToS

Wow this looks very sexy, thank you

Not a single example of what it does or how it works

The self-hosting solution is completely crippled, everything is paywalled. At this point, might as well go closed source.

Probably the commit history.

Have fun dodging that minefield when distributing your app.

With the insane licensing costs, I fail to see how this is still a viable choice for personal / small projects. Also, for larger projects, assuming you can afford the costs, the reality is that it's really hard to find decent Qt developers.

The admin panel requires an email and a password to check out.

It appears to have a fatal flaw: you can't actually save and restore your data, just export it to PNG.

This article is an oversimplification describing basic forms, but as soon as you try to implement any sort of advanced validation using just HTML, the whole paradigm falls apart. Browsers support JavaScript for a reason.