Your AI shouldn't live in someone else's computer

Every AI you've ever used lives in a data center you'll never see. You rent it by the month. Someone logs what you type. And the day the company changes its pricing — or its mind — your “assistant” changes with it. We've all just quietly accepted that intelligence is something you lease.

I didn't want to accept that. So this week I built Hearth — a beautiful, free AI that runs entirely on your own computer. No account. No subscription. No internet required. And nothing you say ever leaves your machine.

⚡ Try Hearth free → hearth.kevinchamplin.com

The one idea that makes it work

Here's the trick, and it's almost embarrassingly simple: if the AI runs on the user's device, it costs me nothing to run — which means it can actually be free, and actually be private. Every cloud AI is bleeding money per message; that's why their free tiers are throttled and their privacy policies are long. Push the computation to the edge — to your laptop's own chip — and both problems disappear at once.

Modern browsers can now run a real language model locally using WebGPU. So Hearth's web version downloads a small model once (about a gigabyte), then runs it right inside your tab. After that first load it works on a plane, in a cabin, with the wifi off. The model literally cannot phone home, because there's no home to phone.

I refused to make it look like a cockpit

The other thing that bothered me about AI tools: they all look the same. Blue gradients, neon, circuit-board textures, a robot icon. Cold. Technical. Intimidating to anyone who isn't already a believer.

Hearth goes the opposite way. The whole design language is warm light, not cold tech — a glowing ember that breathes, warm paper, a quiet room you'd actually want to sit in. The goal was a tool my mom could open and understand in five seconds, that a designer would also find genuinely beautiful. Local AI deserves a beautiful home, not a dashboard.

What it actually is

• Free, forever. It runs on your hardware, so there's nothing to bill.
• Private by nature. The model is on your device; conversations never leave it.
• Works offline. One download, then it's yours — internet optional.
• No account. You open it and you're talking. That's the whole onboarding.

It's open source, too — the code is on GitHub. A native Mac/Windows/Linux app (with bigger, smarter models) is next, and I'm building the whole thing in the open.

Why I'm sharing this

I'm not selling anything here. Hearth is a passion project — the kind of thing you build because you think it should exist. But I also believe the future of AI isn't only giant models in distant data centers. Some of it belongs right here, on the machine in front of you: warm, private, and yours.

Go light the hearth: hearth.kevinchamplin.com. Turn your wifi off afterward and watch it keep working. That part still makes me smile.