You can run a smart home without the cloud, but it takes deliberate choices. Most smart plugs, bulbs and cameras send every command through their maker’s servers, so they stop working when the internet does and they report when you’re home. For local control, pick devices that support Matter, which talks directly over your home network, and run them through a local hub such as Home Assistant or a hub from Apple, Google, Amazon or Samsung. For voice, the big assistants still send your requests to their servers; Home Assistant’s Assist is the main option that can run entirely on your own hardware.
Why does the cloud matter for a smart home? #
A cloud-dependent device usually works like this: your phone sends a command to the company’s server, and the server sends it back down to the device in your house. That has three downsides.
- Reliability. If your internet or the company’s servers go down, the lights may not switch, even though your phone and the bulb are in the same room.
- Privacy. The company logs when devices turn on and off, which reveals when you wake up, leave and come home. Cameras and doorbells can send far more.
- Longevity. If the company drops the product or shuts down its service, a cloud-only device can stop working for good.
Local control fixes all three: the command goes from your phone or hub straight to the device over your own network.
How do you get local control? #
Choose Matter devices #
Matter is an open smart home standard backed by the Connectivity Standards Alliance. It’s IP-based, runs over Wi-Fi, Thread and Bluetooth Low Energy, and the Alliance lists “consistent and responsive local connectivity” among its core features. Matter devices work with Amazon Alexa, Apple Home and Siri, Google Home and Samsung SmartThings, so you’re not locked to one brand. See the Alliance’s Matter page for the official overview.
Two practical notes:
- Thread devices need a Thread border router, a role many recent smart speakers, streaming boxes and hubs already fill.
- Matter covers core controls well. Brand-specific extras, like a camera’s cloud recordings, may still go through the maker’s app.
Run a local hub #
The hub is what runs your automations. If the hub is in your house and the devices speak Matter or another local protocol, “turn on the porch light at sunset” keeps working when the internet is down.
| Option | How local | Best for |
|---|---|---|
| Home Assistant | Designed to run entirely at home; cloud is optional | People who want the most control and privacy |
| Apple Home with a home hub | Local control for many Matter and HomeKit devices | iPhone households |
| Google Home | Local control for many Matter devices, more cloud features | Android and Nest households |
| Amazon Alexa | Local control for some Matter devices; the assistant itself is cloud-based | Echo households |
| Samsung SmartThings | Mix of local and cloud, depending on device and hub | Galaxy households |
Each platform’s local support depends on the device, the hub model and software updates. The quick test is the same as for any “offline” claim: unplug your router’s internet line and try your most important automations.
Can you have a private voice assistant? #
Only partly, with the big names. Alexa, Google Assistant and Siri listen for their wake word on the device, but the request after the wake word is generally handled on their servers. Amazon’s newer Alexa+, launched in February 2025, is a generative-AI assistant that costs $19.99 a month or comes free with Prime, and it runs in Amazon’s cloud. We compare the assistants in the most private AI assistant, and cover their privacy settings in voice assistant privacy settings.
The fully local option is Home Assistant’s Assist. Home Assistant says Assist “can run fully on your own hardware, so your voice commands stay private,” and it recommends its Home Assistant Voice Preview Edition speaker as dedicated hardware, while budget builds are possible with ESPHome devices. You can also connect Assist to cloud language models for more conversational answers, but that’s your choice rather than the default. Details are on Home Assistant’s voice control page.
The trade-off: local voice understands fixed commands for your devices well, and it’s weaker at open-ended questions than a cloud assistant.
Where does AI on your phone fit? #
Your phone is the remote control for all of this, and the Home app of your choice talks to the hub over your local network when you’re at home.
A chat AI running on your phone can’t switch your lights. It isn’t connected to your devices, and giving an AI model control of your locks and cameras is a decision to make carefully anyway. It can help with the parts that usually send people to a cloud chatbot:
- Writing automations. Describe what you want (“lights to 30% at 10 pm on weekdays unless the TV is on”) and ask for a Home Assistant automation in YAML. Code blocks come with a copy button.
- Debugging a config. Paste the YAML that isn’t working and ask what’s wrong.
- Planning a setup. Compare Thread and Wi-Fi, work out which devices need a hub, or draft a shopping list.
- Reading manuals. Attach a device’s PDF manual and ask how to factory reset it or pair it with Matter.
Personal LLM does these on the phone itself with open models such as Qwen 3.5 and Ministral 3, so your floor plan, device list and routines aren’t uploaded anywhere. After a one-time model download it works with no connection. Small phone models make mistakes in config files, so test automations before you rely on them. For prompt ideas, see our system prompt examples; a “Home Assistant helper” prompt that lists your device names saves retyping them.
A buying checklist for a private smart home #
Before you buy a device, check:
- Does it support Matter? Look for the Matter logo on the box or listing.
- Does it work without an account? Some devices require one just to set up.
- What happens if the company’s servers go down? Search reviews for “works offline” or “local control.”
- Where do camera recordings go? Local storage (a memory card or home server) is more private than cloud-only plans.
- Does it need a subscription for basic features?
- Is it supported by Home Assistant, even if you don’t use it yet? That’s a good sign of a local API.
Frequently asked questions #
Can a smart home work without internet? #
Yes, if your devices and hub support local control. Matter devices controlled by a local hub, such as Home Assistant or a compatible Apple, Google, Amazon or Samsung hub, can keep running automations and responding to local commands while the internet is down. Cloud-only devices stop.
Does Matter need the cloud? #
Matter is built for local connectivity over your home network, so basic control doesn’t depend on a company’s servers. Some ecosystems and brand apps still add cloud features on top, such as remote access when you’re away.
Is Alexa always recording? #
Echo devices listen locally for the wake word, and what you say after it is sent to Amazon’s cloud to be processed. You can review and delete voice history in the Alexa app’s privacy settings.
Is Home Assistant private? #
It’s one of the most private options, because it’s designed to run on your own hardware and can work without any cloud service. Privacy then depends on the devices and integrations you add, since some of them connect to their own clouds.
Can the AI on my phone control my smart home offline? #
A chat app with a local model can’t control devices. Local control comes from your hub and home app. A local AI on your phone is useful for writing and fixing automations, planning setups and reading manuals privately.