They use Rust, but they basically reinvented the wheel for everything they did, because the existing GUI stuff in the rust ecosystem sucked so badly it wasn't worth fixing.
Which is great, Zed's stack is pretty damn good. But like anything not yet widely used outside of its original use case, it can be rough around the edges, and just plain doesn't support anything that is not needed by Zed.
I evaluated gpui for a project I’m working on. While I’ve found the rendering and performance to be great (and actually switched to Zed as my daily driver after playing with it), the (absence of an) accessibility story made me grudgingly just use tauri.
I really want to love gpui and would like to avoid using webviews, the advantage of web-based apps is that accessibility is (relatively) easy to do if you’re attentive to it. At the time I looked at it, gpui did not support screen readers etc at all.
I suppose I understand why they made that decision given their business priorities, but it’s hard for me to tell my vision-impaired friends and colleagues that there’s literally no way for them to use my app.
I think they wanted more control over the GUI, so the best answer to that is build something that you have 100% control over. In one of their first blog posts they explain more in deep the reasons.
> Inspired by the gaming world, we realized that the only way to achieve the performance we needed was to build our own UI framework: GPUI. [0]
GPUI is not widely used because they only recently started publishing in crates.io [1] and still AFAIK their documentation is not that great yet, I suppose people will start using soon enough it, I was thinking on using it over Iced that was the other GUI that I feel that have future (because it's used by Cosmic Desktop).
I have used egui in actual projects. It is slow, opinionated in a bad way, not very customizable in terms of themes, and definitely not up to date in terms of latest GUI standards. It isn’t even the best RUST GUI project by any of those metrics.
Interesting! I am using it in some complex stuff with 3D graphics (A structural biology/molecular dynamics tool), and it is a great experience. I need to compare it to GPGUI and Slint; would love to compare the pros and cons first-hand.
As I said above, they all suck in some way. It's a matter of deciding what is most important to you and picking the one that sucks least for that.
Egui is easy to get started with, and has a lot of widgets that work out of the box. The performance story isn't great, layout options is terrible (largely due to being immediate mode), and it is not very customizable. You take what they give you, and you like it.
Iced is a phenomenal and well-thought out API that is a wonder to work with. When it does what you need, which it often doesn't because it's not nearly as complete as the alternatives. But if you know that a monad is a monoid in the category of endofunctors, Iced might be right for you.
Slint is like Qt, but Rust. I don't think I need to say any more - if you have used Qt before, that sentence either immediately sold you on it, or convinced you to never go near it.
GPUI is a wonderful, extremely fast, stable, perfect API. If you are making a cross-platform native text editor. If you are doing anything else, sorry :(
There are a slew of projects bridging rust to run packaged browser apps which have some sort of DSL for specifying HTML front ends. People seem to like this for some reason. Some people also like being chained up in leather and whipped. I sometimes wonder if these are the same people.
Ratatui really is the best of the bunch. It has layout, accessibility, nice and easy user interface. It's a wonder to work with. Only problem: it is a TUI, not a GUI.
Which is great, Zed's stack is pretty damn good. But like anything not yet widely used outside of its original use case, it can be rough around the edges, and just plain doesn't support anything that is not needed by Zed.