What Is Local AI? A Plain-English Guide to AI That Runs on Your Computer
Local AI is artificial intelligence that runs directly on your own computer instead of in a far-away data center. The AI model lives on your device, so when you ask it something, your words never leave your machine — there's nothing to send to a company's servers, and nothing for anyone else to store.
If that sounds a little magical, don't worry. The idea is simpler than it seems, and you can try it for free in a few minutes. Let's walk through it the way you'd explain it to a curious friend.
How is local AI different from ChatGPT?
When you use most AI tools — ChatGPT, Gemini, and the rest — you're typing into a window, but the actual thinking happens somewhere else. Your message travels over the internet to a giant building full of computers (a "data center"), the AI works out a reply there, and the answer travels back to you. The cloud, in plain terms, is just someone else's computer, rented by the minute.
Local AI flips that around. The model sits on your laptop or desktop, and all the thinking happens right there. Nothing has to leave the room.
A helpful way to picture it: streaming a movie means the film stays on a company's server and you watch it over the internet. Downloading a movie for a flight means it lives on your device and you can watch it with no signal at all. Local AI is the "download it once" version of AI.
To be fair: the big cloud tools are still the right call for huge, complicated projects, because data centers have enormous power that no laptop can match. Local AI isn't trying to win that race. It's the simpler, private, free, yours alternative for everyday things.
Is local AI private?
This is the part people care about most, and it's the heart of why local AI exists.
Because the AI runs on your machine, your conversations stay on your machine. You're not handing your questions to a company. They aren't stored on a server, used to train anything, or sitting in an account somewhere waiting to leak. It's a warm light in a cold cloud — your words stay home with you.
That makes local AI a comfortable place for the things you'd hesitate to type into a website: a draft of a hard email, a health question, money worries, a journal entry, anything personal. With a tool like Hearth, there's no account to create and nothing to log in to, because there's nowhere to send your information in the first place.
Is local AI free?
It can be — and Hearth is. Here's why that's possible.
With cloud AI, every answer costs the company a little money in electricity and computer time, so they usually charge a monthly fee or limit how much you can use. With local AI, your computer does the work, so there's no meter running and no subscription to pay.
There's one small, one-time step: you download the AI model itself, which is around a gigabyte — roughly the size of a movie. After that, it's yours. It even works offline, so you can keep chatting on a plane, in a cabin, or anywhere the Wi-Fi gives up.
What can local AI actually do?
A surprising amount, for everyday life. Local AI is genuinely good at the things most of us reach for AI to handle:
- Answering questions and explaining tricky topics simply
- Helping you write and polish emails, messages, and posts
- Brainstorming ideas, names, plans, and gift lists
- Working out what to cook from what's in your fridge
- Summarizing long text so you don't have to read all of it
- Just talking something through when you need a second brain
Where it bows out is the truly massive stuff — analyzing a giant spreadsheet, writing a whole app, or reasoning through a long, dense research project. Those need the muscle of a data center, and that's okay. Hearth isn't here to replace the big tools for big jobs. It's here for the dozens of small, personal moments in between, kept private and free.
How do I try local AI?
You can be chatting with local AI in about the time it takes to make coffee. There are two easy ways to use Hearth:
- Right in your browser. Open Hearth in Chrome or Edge and it runs using your computer's graphics chip — no installing anything. You can try Hearth in your browser and start a conversation after the one-time model download finishes.
- As a desktop app. If you want bigger, smarter models, there's a native app you can install that makes more of your computer's power available.
Either way, the first chat involves that quick download. After that, it's fast, private, and ready whenever you are — online or off.
If you'd like the short version of the common questions — which browsers work, how big the download is, whether it really runs offline — the /faq page covers it in plain language.
Local AI won't replace the cloud for everything, and it isn't trying to. It's just a quieter, kinder option for the everyday — a small fire of your own that you don't have to rent. Whenever you're curious, Hearth will be here, ready to talk.