Iced seems really promising, however, it's a passion project by a single developer. They very clearly stated that their goal is to follow their passions and desires first, everyone else second, and that it will always be a single person project. Their readme even discourages contributions.

Companies using it in production are often forking it as a result, and trying to keep their fork in sync. Ultimately, if the community wants iced to become a major and stable framework, it will have to be forked and a community development model built around it.

And I'm not saying this to disparage the author in any way, their readme even seems to suggest that that's exactly what they'd prefer.

I'm partial to Dioxus with their native renderer coming up, it should work cross-platform on mobile, web, desktop like Flutter (except web is actually HTML and CSS, not canvas) rather than only desktop which is what most Rust GUI frameworks are targeting.

https://github.com/DioxusLabs/blitz

Not contesting your claim, but would you mind sharing what major hardware vendor you mean?

I love iced and wrote a decent amount of code using it, but in my mind the biggest sponsor is system76 - and as awesome as they are they aren’t a major vendor yet :)

Not sure how the UI engine itself compares, but to me it is all about the available components (as a total non-designer, although AI helps with that now). The only choice I have at the moment that would meet my needs is gpui, as gpui-component now exists.

There is also Slint : https://slint.dev They are also backed by a company, and have kept a stable 1.x release for some time.