The launch graphic says "Ported end-to-end by Fable, an AI agent" and it definitely feels that way. Buggy, glitchy, needs some love and human eyes before it's really usable.
FreeCAD on desktop is much the same in my experience. If LLMs were mainstream a few years ago I would have assumed the UI was 100% AI generated with zero human input besides a oneshot prompt.
Onshape is free in the browser as long as you are not doing commercial work. It’s a professional system from the founders of Solidworks that competes with all the top CAD tools.
> It’s a professional system from the founders of Solidworks that competes with all the top CAD tools.
Because it's built on Parasolid, the same geometric kernel as everyone else. With ACIS pretty much out the door, almost all the professional CAD packages are just window dressing on the same CG implementation.
Agreed. I’m not OP but for six months I’ve been using Claude to build a from-scratch CAD kernel based on Rust and WASM, MIT licensed.
The actual UI still needs a lot of work, but I’ve been focused on the kernel. Fable has helped a lot though Opus was already making great headway.
I’m an OnShape power user going back about ten years, Solidworks before that. I need a CAD system that absolutely works. There is a lot of work to do still, and it still seems impossible to succeed, but I’ve been very happy with where things have been going with it lately.
It’s serverless, local, and browser based. You can load the latest binary from GitHub pages here:
Six months. Basically when Claude code started to hit that inflection point I chose a project that seemed potentially impossible but was also something I care deeply about. (I have a lot of history with open source and CAD and I even made an open source CAD forum on GitHub a few years ago to discuss options.)
I set up remote tmux access to my phone right at the beginning so I have been advancing it rather continuously during my waking hours. Especially the last few months which have been a very focused push on a new kernel architecture.
The app consists of a wasm (web assembly) binary and JavaScript. The wasm runs locally on your machine in your browser and communicates with the JavaScript frontend. There is no backend server to handle any part of the program. The URL just loads the binary in to your local browser. I don’t know exactly how one would set this up but this would work for example fully offline. The browser basically just becomes a universal compute and rendering engine for it.
Author of the port here, you need a browser with JSPI support, which means recent Chrome, or Firefox Nightly with the feature flag flipped, or Firefox from the future.
I will also note that it's possible to compile this with wasm asyncify, but the result iirc is a ~400MiB Wasm binary that will crash the browser tab before you will be able to do anything useful in it.
I made the port, roughly ~one maxed out Claude Max 20x sub, at the bottom of the article I've shared the full claude code transcripts, so you can probably to some rough math on token usage with that.
Edit: to be precise 'maxed out' means one weekly limit on fable used over those 4 days
Browser can be local. What’s nice about browser based is that browser based programs can run on every device. Though it sounds like this one requires chrome which seems weird to me.
Because then it doesn't matter what you're running locally, as long as you've got a supported browser (Chrome, I'm guessing). It means it doesn't have to make a difference if you have a Window 10 desktop or a MacBook Air or a Chromebook. Go to the web page and look at this CAD.
LibreCAD in the Browser - https://news.ycombinator.com/item?id=48755075 - July 2026 (17 comments)
Because it's built on Parasolid, the same geometric kernel as everyone else. With ACIS pretty much out the door, almost all the professional CAD packages are just window dressing on the same CG implementation.
The actual UI still needs a lot of work, but I’ve been focused on the kernel. Fable has helped a lot though Opus was already making great headway.
I’m an OnShape power user going back about ten years, Solidworks before that. I need a CAD system that absolutely works. There is a lot of work to do still, and it still seems impossible to succeed, but I’ve been very happy with where things have been going with it lately.
It’s serverless, local, and browser based. You can load the latest binary from GitHub pages here:
https://sequoia-hope.github.io/waffle-iron/
Click the Assay menu to see the kernel test cases we’ve been using so far. Rapidly closing on 100% support!
I set up remote tmux access to my phone right at the beginning so I have been advancing it rather continuously during my waking hours. Especially the last few months which have been a very focused push on a new kernel architecture.
uhh what..
Edit: to be precise 'maxed out' means one weekly limit on fable used over those 4 days