Some smart-home controls can keep working when the internet or a vendor cloud goes down—but only if your router, local controller, and devices are still running and the relevant feature works locally. A Wi-Fi outage and a power outage are different problems, and neither a local protocol nor a UPS guarantees that every app, voice command, schedule, or advanced feature will remain available.
First, identify what has failed
“The internet is down” does not necessarily mean “the home network is down.” If your router and Wi-Fi remain on, a local controller may still communicate with compatible devices. By contrast, a failed router or access point can strand Wi-Fi devices, while a power cut can stop the router, hub, and devices that have no backup power.
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| Outage | What may still work | What may stop |
|---|---|---|
| Internet or vendor-cloud outage; router and local network remain available | Local controls and automations, if the device, controller, and automation are configured to work locally. | Remote access and features that require the vendor cloud, internet service, or a cloud-connected integration. |
| Router or Wi-Fi outage | Features that do not depend on the failed network may remain available, depending on the device and controller. | Wi-Fi device communication and controller functions that require the router or access point. |
| Mains power outage | Only equipment with a working battery or other backup supply, within its limits. | Unpowered routers, hubs, access points, and devices. |
These are planning distinctions, not guarantees for every product. Offline behavior depends on the exact model, firmware, controller, network setup, and feature.
What can still work when the internet or cloud is down?
A compatible device can often be controlled locally while the home network is intact. Google says Matter commands can travel directly over the home wireless network to a device rather than through Google’s or the manufacturer’s cloud. Google also requires a Matter-capable hub for setup and local control, and notes that IPv6 must be enabled for Matter to work properly on its home network. Google’s Matter guidance explains these requirements.
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- Echo Hub — An easy-to-use smart home control panel redesigned for your home. Arrange controls on your dashboard to quickly adjust devices, view cameras, start routines, and more.
- Customize your dashboard — Arrange devices into sections and resize them to focus on what matters most. Create a personalized layout that matches how your family uses their connected devices.
- Reimagined for your home - With an Alexa+ and compatible Ring subscription (sold separately), get Ring camera event summaries to stay in the know. Search your Ring footage using simple voice commands. Create routines by voice, activate modes to manage multiple devices at once, and chat with Alexa to easily control your smart home.
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The Connectivity Standards Alliance says Matter uses Bluetooth LE for setup and Wi-Fi, Thread, or Ethernet for connectivity; remote control requires an internet-connected controller at home. A Matter label alone does not establish that optional manufacturer-cloud features or every app function will work offline. The CSA’s Matter overview describes the standard’s connectivity model.
Home Assistant identifies Zigbee, Z-Wave, Matter, and ESPHome devices connected locally as not needing internet, provided the local controller and integration are working. An integration that must contact a vendor cloud cannot reach the device through that service when the internet is unavailable. Home Assistant’s FAQ distinguishes local devices from cloud-dependent integrations.
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Local does not mean infrastructure-free
Local control still relies on whatever the device’s architecture requires: a powered controller or hub, a functioning local network where applicable, and a working path between controller and device. Thread is a mesh network, but a Thread setup also needs a suitable Thread border router/controller. Mesh coverage does not replace a failed controller or restore power.
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Wi-Fi behavior varies by product and hub design. For example, IKEA says its smart products need a strong Wi-Fi connection to communicate with the hub, and that the products can appear offline in its app if the connection is interrupted. Treat that as guidance for IKEA’s products, not as a rule for every smart-home system. IKEA’s smart-home support page describes its requirements.
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- Powered by SmartThings: Connect, monitor, and automate your home through the SmartThings app. Build a reliable, unified smart home using Samsung's proven ecosystem
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- Automations That Work for You: Create custom routines for security, lighting, comfort, and energy savings. Many local automations continue working even if your internet goes offline
- Wide Device Compatibility: Connect compatible smart devices from Aeotec and many other brands to build a unified system for lighting, voice control, energy management, and climate settings
Which features are most likely to be affected?
Basic local device control may survive an internet outage while features layered on top of it do not. A phone app may require a vendor service, a voice assistant may need internet access, and a schedule may depend on a cloud service rather than run on the device or local controller. Do not assume that because one command works offline, every feature does.
Amazon’s developer documentation describes Zigbee and Bluetooth LE mesh as local connectivity options, but that alone does not confirm which consumer-device functions remain available during an outage. Check the documentation for the exact model and feature rather than inferring offline behavior from its radio or protocol. Amazon’s Smart Home Skill API documentation discusses supported connectivity options.
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- New size, more viewing area: The 11“ smart display features a vibrant Full-HD touchscreen with 60% more viewing area versus Echo Show 8 (2025 release), built-in smart home hub, AZ3 Pro chip for powerful performance, and Omnisense technology for highly personalized experiences.
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- Crystal-clear video calls: Video calls feel natural on the vibrant 11" screen with a centered, auto-framing camera, 3.3x zoom, and noise reduction technology. Use live view to check in on your family, pets, and more while you're away.
Remote control is a separate case: it generally needs an internet connection. Schneider Electric likewise states that remote control requires internet access. Schneider Electric’s FAQ addresses that limitation.
Prepare the parts of the system you need most
- Inventory essential devices. For each one, note its connection type, required hub or controller, whether control is local or cloud-dependent, and what physical fallback is available.
- Check the exact product documentation. Look for explicit details on local control, offline automations, LAN access, local storage, and whether the mobile app needs an internet or cloud connection. Confirm those details for the model and feature you intend to rely on.
- Keep a non-app way to operate essentials. Where the product supports it, preserve practical alternatives such as a wall switch, lock key or keypad, or thermostat controls. Confirm the device’s actual capabilities rather than assuming a fallback exists.
- Back up power for the network equipment if needed. A UPS can power only the equipment plugged into it, within its capacity and runtime. If you need local control during a power interruption, connect the relevant router and local controller; a UPS will not power devices elsewhere in the home unless they are also connected to an appropriate backup supply. It will not restore an ISP connection or fix failed router hardware. Wirecutter’s UPS overview discusses this power-backup use.
- Back up your controller configuration. Home Assistant includes functionality for configuration backups. Its backup documentation explains the feature.
Test each outage separately
Test when you have time to recover, not during an emergency. Keep the router powered and disconnect its internet connection; then try the local controls, schedules, voice functions, and app features you care about. Record which functions still work and which fail. Restore the internet before moving on.
Next, consider a router or Wi-Fi failure separately: identify which devices lose their communication path and whether any essential action has a physical fallback. Finally, consider a power cut: check which network equipment and controllers a UPS would keep running, and for how long under the actual connected load. Do not infer the result of one test from another—the failure points are different.
What to expect from Home Assistant
Home Assistant says locally connected Zigbee, Z-Wave, Matter, Thread, and ESPHome devices do not need internet, while integrations that depend on a vendor cloud cannot reach the device if the internet is down. Its guidance is about those local connections and integrations; it does not mean every connected feature or every setup works without internet. Home Assistant also identifies Home Assistant Green as a plug-and-play hub and lists Connect ZBT-2 as an optional connectivity device for Zigbee, Thread, and Matter. Setup and compatibility depend on the equipment and configuration. Home Assistant’s FAQ covers internet requirements and local operation.
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