What Is Local AI?
Local AI is artificial intelligence that runs directly on your own device — your phone or computer — instead of sending your requests to a company's server over the internet.
The simple definition
When you type a message to most AI assistants, that message travels over the internet to a data center, gets processed by a large model running on powerful servers, and the answer travels back to your screen. That's cloud AI, and it's how tools like ChatGPT, Gemini, and Claude normally work.
Local AI skips that trip entirely. The AI model lives on your device, and the "thinking" happens on the same chip that runs your camera app or your calculator. Nothing has to leave your phone for you to get an answer. That's also why local AI is often called on-device AI.
Cloud AI = your question goes to a server. Local AI = your question never leaves your device.
How local AI is different from cloud AI
Where the "thinking" happens
Cloud AI models are enormous — often too large to fit on a phone — so they run on server farms with specialized hardware. Local AI models are built or shrunk to fit within the memory and processing power of a single device, which means the model itself is smaller and simpler than the biggest cloud models.
What data leaves your device
With cloud AI, your messages are sent to a company's infrastructure to be processed, and depending on the service, may be logged, reviewed, or used to improve future models. With local AI, there's nothing to send in the first place — the conversation stays on the hardware in your pocket.
Why local AI is becoming possible now
Smaller, smarter models
AI researchers have gotten much better at compressing large models into smaller ones that keep most of the original's ability while using a fraction of the memory. A model that needed a server rack a few years ago can now run on a phone.
Faster phone chips
Modern smartphones ship with chips designed specifically to accelerate AI calculations. That extra horsepower is what makes it realistic to hold a fluid conversation with an AI model without a server doing the heavy lifting.
What local AI is good for
- Privacy — there's no server that ever sees your conversation.
- Reliability offline — it keeps working with no Wi-Fi, no signal, and no service outages. See why offline AI matters.
- Consistent cost — no server bills to pass on, so local AI apps often skip the monthly subscription model entirely.
- Speed for simple tasks — no network round-trip means answers can start appearing almost instantly.
What local AI can't do (yet)
Local models are smaller than the largest cloud models, so they're usually not the best choice for extremely complex reasoning, huge documents, or tasks that need live internet information, like today's news or current stock prices. For everyday conversation, writing help, and quick questions, though, a well-built local model can feel just as capable.
Local AI in action: Cloak
Cloak is a private AI assistant that runs entirely on your iPhone. It downloads its AI model once, then works completely offline from then on — no account, no server, no internet connection required to chat.
If you want to see exactly how that works under the hood, read how Cloak works, or compare the experience directly against a cloud tool in ChatGPT vs. local AI.
Try local AI on your iPhone
Cloak is a private AI assistant that runs entirely on your iPhone — download the model once, then chat anywhere.
