First Alert is a US home safety brand that makes smoke, carbon monoxide and combination alarms, including connected models sold under the Onelink name. The brand is owned by Resideo, and its connected alarms are managed in a phone app.
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Connected First Alert alarms join your Wi-Fi and link to each other wirelessly, so when one sounds the others do too. The older Onelink alarms add Apple HomeKit and, on the Safe & Sound, a built-in Alexa speaker. The newer SC5 alarm is reported by trade press to work alongside Google's Nest Protect.
That suits a home that wants interconnected alarms with phone alerts, either in the Apple Home world with older Onelink units or alongside Google's Nest Protect with the SC5, according to CE Pro. It is less clear for open platforms: we found no official Home Assistant or Homey support, and the first-party Onelink range is partly discontinued with a poorly rated app.
Source: Resideo: First Alert app
The current app. Resideo's page says it is used to check status, test alarms and receive mobile smoke and CO alerts for the SC5, and it also lists Resideo thermostats, a water leak detector, a doorbell and a camera. The page itself is titled The Resideo Connect App, and we did not confirm whether the two names are the same app.
The older app for Onelink alarms. It installs, pairs and monitors Onelink devices, including the Safe & Sound and the Smoke + CO alarms. The App Store listing credits BRK Brands, the latest version in its history is 1.84.6 from December 2023, and it carries a 1.5 out of 5 rating from 306 ratings. We could not verify an Android listing.
Official supported by the brand Community built by someone else Not found searched, nothing found Unconfirmed sources conflict or could not be opened
| Platform | Status | What it means | Sources |
|---|---|---|---|
| Connection | |||
| Wi-Fi | Yes | First Alert's store page for the battery Onelink alarm lists Wi-Fi and Bluetooth, and says alarm functions work without Wi-Fi while push notifications and Alexa features need it. The page does not give a Wi-Fi band. | Onelink battery alarm (store page) |
| Bluetooth and wireless interconnect | Yes | The Onelink store page says a Bluetooth mesh lets Onelink alarms communicate with each other, and the SC5 product pages describe wireless interconnect, where all compatible alarms sound together when one alarm goes off. | Onelink battery alarm (store page) SC5 on Resideo |
| Zigbee, Z-Wave, Thread | Not mentioned | None of these are mentioned on the Onelink or SC5 product pages we read. | SC5 on Resideo |
| Matter | Not found | Matter is not mentioned on the Onelink or SC5 product pages we read, and the Resideo page names no specific ecosystems. We found no Matter announcement from First Alert. | Searched, no source |
| Voice assistants and ecosystems | |||
| Apple Home | Official | The Onelink alarms are listed as HomeKit compatible on First Alert's store page, and press coverage from 2018 describes HomeKit on the Safe & Sound and the second-generation alarms. The Onelink Home app listing does not mention HomeKit, and its user reviews are mixed on how much works. The SC5 pages do not mention Apple Home. | Onelink battery alarm (store page) MacRumors: Safe & Sound Onelink Home app listing Apple Home accessories list |
| Amazon Alexa | Official | Alexa is built into the Onelink Safe & Sound speaker, per MacRumors and the Onelink Home listing. The store page for the battery Onelink alarm is inconsistent, calling it compatible while its FAQ says Alexa voice services are not supported, with status checks through Onelink Alexa skills. The SC5 pages do not mention Alexa. | MacRumors: Safe & Sound Onelink Home app listing Onelink battery alarm (store page) Alexa Skills store |
| Google Home | Not mentioned | CE Pro reported a First Alert and Google Home partnership in March 2025, aimed at alarm interoperability with Google's Nest Protect. The article is the only source used here, and we could not confirm which models are covered or whether Google Assistant voice control is included. | CE Pro, March 2025 |
| Open platforms and developer access | |||
| Home Assistant | Unconfirmed | We found no First Alert-specific integration page. Forum users report pairing Onelink Safe & Sound units through Home Assistant's built-in HomeKit Controller, which exposes a night light, battery, smoke and CO sensors but no way to test or silence the alarm. Reports from 2019 to 2022 say battery and non-speaker models use HomeKit over Bluetooth and do not work. Home Assistant maintains HomeKit Controller, not First Alert, and results may have changed since. | Home Assistant community thread |
| Homey | Unconfirmed | Not searched directly, so we could not confirm any Homey app for First Alert or Onelink. | Searched, no source |
| Developer or local API | Not found | No public developer API or local API was found on the First Alert, Onelink or Resideo pages we read. | Searched, no source |
| openHAB, Node-RED, Samsung SmartThings, Hubitat, Domoticz, Control4, Philips Hue, IFTTT | Unconfirmed | Not searched individually, so we could not confirm any integration. | Searched, no source |
Checked 11 November 2026 against the brand's own pages, app store listings and each project's own page. “Not found” means we searched and found nothing, not that it is impossible. Compatibility changes often. Spot an error? Tell us and we will fix it.
Not that we could find. Matter is not mentioned on the Onelink or SC5 product pages we read, and the Resideo page names no specific ecosystems. We found no Matter announcement from First Alert.
Yes, officially. Alexa is built into the Onelink Safe & Sound speaker, per MacRumors and the Onelink Home listing. The store page for the battery Onelink alarm is inconsistent, calling it compatible while its FAQ says Alexa voice services are not supported, with status checks through Onelink Alexa skills. The SC5 pages do not mention Alexa.
Not that we could find. CE Pro reported a First Alert and Google Home partnership in March 2025, aimed at alarm interoperability with Google's Nest Protect. The article is the only source used here, and we could not confirm which models are covered or whether Google Assistant voice control is included.
Yes, officially. The Onelink alarms are listed as HomeKit compatible on First Alert's store page, and press coverage from 2018 describes HomeKit on the Safe & Sound and the second-generation alarms. The Onelink Home app listing does not mention HomeKit, and its user reviews are mixed on how much works. The SC5 pages do not mention Apple Home.
Unconfirmed. We found no First Alert-specific integration page. Forum users report pairing Onelink Safe & Sound units through Home Assistant's built-in HomeKit Controller, which exposes a night light, battery, smoke and CO sensors but no way to test or silence the alarm. Reports from 2019 to 2022 say battery and non-speaker models use HomeKit over Bluetooth and do not work. Home Assistant maintains HomeKit Controller, not First Alert, and results may have changed since.
Unconfirmed. Not searched directly, so we could not confirm any Homey app for First Alert or Onelink.
Answers come from the sourced table above. See how First Alert compares with all brands on the smart home brand statistics page.