Yes. Home Assistant runs on hardware in your home, so locally connected devices and automations can keep working when your internet connection fails. The important distinction is how each device connects: a device that depends on its manufacturer’s cloud may stop responding, even while Home Assistant itself remains available on your home network.
What works during an internet outage?
Home Assistant’s controller operates locally; Home Assistant Cloud is not required to keep the local system running. Home Assistant’s FAQ says that choosing devices that work locally is the most reliable way to keep a smart home running through an internet outage. Its glossary describes Home Assistant as cloud-independent: it does not need an internet connection or a vendor cloud account to keep a smart home running.
If Home Assistant can communicate with a device over your home network or a local radio connection, that device may remain controllable and its Home Assistant automations may continue to run. That is conditional, not a guarantee that every device or feature will behave unchanged. An internet outage is also different from a power failure, a failed Home Assistant host, or a failure of the home network; the cited guidance does not promise operation through those separate failures.
Which devices work locally?
Home Assistant identifies Zigbee, Z-Wave, Matter, Thread, and ESPHome as local technologies that do not need internet access. But a protocol name or brand alone does not establish that every product feature works offline: the particular device and its Home Assistant integration determine whether communication is local or cloud-dependent. Check the integration documentation and the exact model before relying on it during an outage.
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- Home Assistant provides a professional and reliable platform for home automation, designed to run continuously 24/7.
- Powered by a 64-bit Quad-Core Cortex-A53 processor, delivering smooth and efficient performance for smart home automations.
- Includes 4GB SDRAM for reliable multitasking and 64GB eMMC
- Features a Mali-450 MP2 GPU for responsive visual interfaces, housed in a compact 85 × 85 × 15mm (3.35" × 3.35" × 0.59") design that fits easily in any space.
- Typical power consumption is under 10W, with fanless operation for quiet performance suitable for any room in your home.
- Local connection: Home Assistant communicates with the device directly over your network or a compatible local radio. Control and automations using that local connection can remain available without the ISP connection.
- Manufacturer-cloud connection: The integration reaches the device through the vendor’s online service. That route is unavailable if the internet connection fails, so the device may not respond through Home Assistant.
Home Assistant’s integration documentation is the place to check connection details. Its Works with Home Assistant program highlights devices tested for local control; verify the specific model and integration rather than assuming all products from a manufacturer behave alike.
Can you open Home Assistant at home without internet?
Usually, if the home network is still working and your phone or computer can reach the Home Assistant instance over that network. Home Assistant listens on the local network by default, so loss of the ISP connection does not by itself remove the local path. If the router, Wi-Fi, or local network is also down, local access may fail for that separate reason.
Rank #2
- Powered by SmartThings: Connect, monitor, and automate your home through the SmartThings app. Build a reliable, unified smart home using Samsung's proven ecosystem
- Matter + Zigbee Smart Home Hub: Supports the newest Matter standard plus Zigbee for lighting, sensors, plugs, switches, thermostats, and more - thousands of compatible devices. PLEASE NOTE: Z-Wave not supported
- Easy Setup with Wi-Fi or Ethernet: Get started in minutes using Wi-Fi or a wired Ethernet connection for apartments, houses, and expanding smart home systems - Z-Wave not supported
- 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
Can you control Home Assistant remotely during an outage?
Generally, no. Remote access from work or while traveling needs a working connection to the Home Assistant instance at home. If the home internet connection is down, a remote-access method cannot reach it through that connection.
When the home connection is available, Home Assistant documents several remote-access approaches:
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Rank #3
- MULTI-MODE GATEWAY: Smart home bridge supports Zigbee, Bluetooth Mesh dual-protocols, and supports WIFI control at the same time. Whether your device supports Wi-Fi or ZigBee or Bluetooth, you can control them together through the smart gateway on the Smart Life App. It is more stable and safer than using wifi system.
- APP CONTROL: Smart Bluetooth Zigbee hub work with smart life/Tuya App, Support Adding devices, device reset, third-party control and group control. You can manage and remotely control the device through the Smart Life App. You can manage and remotely control your lights, fingerbot and other smart devices via the app, even when you're not home.
- VOICE CONTROL: Smart Zigbee gateway Bluetooth hub compatible with Amazon Alexa/Google Assistant Home/Siri, you can control Smart LED and smart home devices by voice. All smart devices can be controlled with just one command, freeing hands.
- CREAT A SMART SCENE: Sub-devices of the gateway act as trigger conditions for Interacting with devices such as ZigBee, Bluetooth, Wi-Fi, for device linkage. Featured as one powerful network bridge for whole house linkage in a real sense for all smart home devices.
- MULTI-DEVICE COMPATIBILITY: Wireless gateway, Compatible with various smart home devices, you can add and control 128 smart devices at the same time, Zigbee hub is like a brain, stably manages multiple devices. Build a fully intelligent home ecosystem. 24 months warranty included
- Home Assistant Cloud: An optional service that provides remote access and selected cloud-connected features.
- VPN, reverse proxy, or port forwarding: Other documented approaches that require setup and attention to security. Home Assistant cautions against exposing an instance directly without a secure method; see its security guidance before configuring access.
Home Assistant Cloud is not needed for local operation; its relevance here is remote access and cloud-connected features. See the official Home Assistant Cloud information and remote access documentation for details.
Which features need internet?
Local control is separate from services that depend on an outside connection. Home Assistant lists cloud remote access, Apple Home, Google Home, and Amazon Alexa integrations, updates, and app-store access among features that need internet. During an outage, those cloud-linked features or downloads may be unavailable even if locally connected devices continue to work.
Rank #4
- [Multi-Protocol Hub with Matter Bridge] The M3 is a versatile hub supporting Aqara Zigbee and Thread devices. It integrates third-party devices into the Aqara Home app. Supports advanced Matter bridge functionality, enabling Aqara-exclusive scenes and signals to sync with Matter ecosystems such as Home Assistant for seamless integration. Supports up to 127 Aqara Zigbee devices （** Not third-party Zigbee devices) and 127 Thread devices (Repeaters are needed).
- [Edge Compatibilities and Local Automations] The M3 serves as an Edge Hub, prioritizing local control and automation. Upon integration, it supersedes existing Aqara hubs, shifting the automations among them to local operation (Some cloud-based notifications still require internet). Upgrade-friendly, it supports migrating Zigbee devices from older Aqara hubs.
- [Smart IR Blaster with Feedback and Learning] The 360°IR blaster not only sends commands but also provides accurate status updates by detecting traditional remote use. It connects IR air conditioning units to Matter, functioning as an AC thermostat when paired with an Aqara Temperature and Humidity Sensor. (Note: Only one AC device can be exposed to Matter. Functionality may vary based on the Matter integration app. For Apple Home exposure, use Matter integration instead of HomeKit.)
- [Optimal Wired and Wireless Connectivity] Offering both wired and wireless solutions, the smart home hub M3 provides dual-band Wi-Fi (2.4/5 GHz) with advanced WPA3 security, and a Power over Ethernet (PoE) port. The addition of a USB-C port allows for mini-UPS and power bank connections, delivering unparalleled stability. (2A USB power adapter is not included. ) . Note: To ensure a stable connection, place the Hub M3 between 6 to 19 feet from the router.
- [Privacy-Focused with Encrypted Storage, Easy Setup and Versatile Placement] The M3 prioritizes privacy by excluding microphone or camera components. It boasts 8GB end-to-end encrypted local storage, for device lists, configuration parameters, and automation configuration data. Additionally, it includes a mount and screws for flexible placement on flat surfaces, walls, or ceilings. Magic Pair technology ensures effortless detection by the Aqara Home app upon power-up.
Can voice control stay local?
Yes. Home Assistant Assist can use local speech-to-text and text-to-speech components, but the fully local setup has prerequisites: listening hardware, integrated speech services, and Home Assistant Operating System. Home Assistant also offers a cloud voice-processing option; in that pipeline, audio is sent to Nabu Casa servers for processing. Choose the pipeline that fits your privacy and setup preferences, and consult the official guides for fully local voice setup and Home Assistant Cloud voice setup.
What hardware do you need for offline operation?
You need an always-on device to host Home Assistant, but there is no single required product. Home Assistant Green is a ready-to-use host with Home Assistant preinstalled; a Raspberry Pi, mini PC, NUC, or virtual machine may also suit a setup. Green is the recommended plug-and-play option for many users, not a requirement. Review the official installation options and FAQ when choosing a host.
Radio hardware is also conditional. Home Assistant Connect ZBT-2 is an optional accessory for Zigbee, Thread, and Matter; you need compatible radio hardware only if your chosen devices and setup require it. It is not necessary for every Home Assistant installation.
Quick Recap
How to check whether your setup will survive an outage
- Identify how each device connects. Read the specific Home Assistant integration documentation and confirm whether it communicates locally or requires the manufacturer’s cloud.
- Check the features you rely on. A device may offer local control for some functions but rely on a cloud service for others. Verify the exact model and desired functions.
- Separate local and remote needs. Test access from a device on your home network separately from access while away; remote access depends on a connection to your home instance.
- Review dependencies beyond the ISP link. The host needs power, and local control needs the home network or relevant radio and devices to be operating. Those are separate from internet availability.
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