I saw a post on Hacker News this morning. Two friends launched a browser-based parametric CAD tool called Arcad. Free. No signup. No install. Just click and start modeling. The comments were predictable: “Nice, but why in the browser? Software is not a web page.”
That commenter is right. Every time you open a browser app, you’re not using software — you’re renting someone else’s computer. And that rental agreement is written in fine print you never read.
Let me be clear: I’m not picking on Arcad. The tool itself looks solid — OpenCascade, STEP export, touch controls. The creators are talented. But the model is the problem. And the model is spreading like a virus.
Here’s the seduction: zero friction. No downloads, no license keys, no “requires 16GB RAM and a graphics card from this decade.” You open a tab, you’re designing. It feels like magic. But magic always comes with a hidden cost, and the bill is due when the Wi-Fi goes down.
I’ve been there. I modeled a custom bracket in a browser CAD tool. Two hours of work. The server hiccupped. My session was gone. The “auto-save” hadn’t triggered. I learned the hard way that your data doesn’t exist on your machine — it exists on a server you don’t control, owned by a company you’ve never met.
This isn’t about Arcad specifically. It’s about the creeping normalization of software-as-a-service in spaces where permanence matters. CAD files are not photos. They’re not tweets. They are the blueprints of physical things — things you might machine, 3D print, or build. Those files should be yours, fully, forever.
I get it: local software is a pain. Installers, updates, compatibility. But the alternative is worse. Free tools are not free. They are a trade: your autonomy for their convenience. And once you’re dependent on a browser tool, switching costs become enormous. You can’t export your workflow, your history, your muscle memory. You’re locked in.
So here’s my twist: the enemy isn’t the browser. It’s the mindset that “accessible” means “no ownership.” The real breakthrough would be a browser tool that also runs offline, that stores your data locally by default, that gives you the source code. Arcad doesn’t do that. Most don’t.
Next time you see a “no signup, free, browser-based” tool, ask yourself: What am I actually giving up? Because the answer isn’t nothing. It’s everything.
FAQ
Q: Are browser-based CAD tools like Arcad completely useless?
A: No. They are great for quick prototyping, collaboration, and low-commitment projects. But they are dangerous for anything you plan to keep, iterate on, or rely on long-term.
Q: What should I use instead?
A: If you need full control, use a local parametric CAD like FreeCAD, SolveSpace, or even OpenSCAD. They're free, open-source, and run offline. The trade-off is a steeper learning curve and less polish.
Q: Isn't the cloud the future? Why fight it?
A: The cloud is the future for collaboration and compute. But that doesn't mean your personal files should live only on a server. The future should be hybrid: local-first with optional sync. Anything less is a step backward in user rights.