Google Home (Nest) smart home kit for security
A compatible Google Home (Nest) starter kit for security: 3 devices plus 1 hub/bridge, about $465. Every pairing checked against manufacturer docs.
Devices
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Aqara Smart Lock U100 $190
Needs: vendor hub
'Fully supports the Apple Home app' incl. Apple home key - works standalone for the Apple path. Alexa, Google Home, IFTTT and Matter each require an Aqara Zigbee 3.0 hub ('To use remote features... an Aqara 3.0 hub is required'). SmartThings/HA not manufacturer-claimed.
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Aqara Video Doorbell G4 $100
HomeKit Secure Video (end-to-end encrypted, HomePod notifications, Apple TV streaming) plus streaming/2-way talk on Echo and Nest displays. 2.4 GHz WiFi only; bundled chime acts as repeater + local storage. 'A future update will add Matter support' - not active. Battery (6x AA) or wired. No subscription needed (7-day free event cloud + microSD).
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Wyze Cam v4 $45
'Alexa, Google Assistant, IFTTT' (Wyze). No HomeKit, no Matter, no SmartThings mentioned. 2.4 GHz WiFi 6 + BT 5.2. 24/7 recording to microSD works without subscription; cloud AI features need Cam Plus.
Hubs and bridges you also need
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Aqara Hub M3 $130
Required as: vendor hub
'$129.99 in the US.' Aqara's first Matter CONTROLLER, a Thread border router, and 'a Matter bridge for non-native Matter Aqara devices' (exposes Aqara Zigbee children like the U100 lock to other ecosystems). Dual-band WiFi, PoE Ethernet, Bluetooth, 360-degree IR blaster.
Total
$465