Ecobee SmartSensor for Doors & Windows vs Sonoff DW2-WIFI

The Sonoff DW2-WIFI wins overall. It is far more affordable, needs no hub, and supports Google Home, Alexa, Home Assistant and IFTTT with 90-day history. The Ecobee SmartSensor for Doors & Windows counters with a higher owner rating, a longer 3-year warranty, and added occupancy sensing, but it requires an ecobee thermostat.

Independence. The Sonoff DW2-WIFI connects directly to Wi-Fi and reaches multiple platforms on its own, while the Ecobee SmartSensor for Doors & Windows is not standalone and only works with an ecobee thermostat, exposing platforms through it.

The Sonoff DW2-WIFI does, connecting straight to 2.4GHz Wi-Fi (though pairing on modern routers may need the Wi-Fi b protocol enabled). The Ecobee SmartSensor for Doors & Windows cannot work at all without an ecobee thermostat.

The Ecobee SmartSensor for Doors & Windows. It adds occupancy detection beyond contact sensing, while the Sonoff DW2-WIFI is a contact-only sensor. The ecobee is the pick if you want built-in presence detection, though its motion alerts require a subscription.

Buy the Ecobee SmartSensor for Doors & Windows if you own an ecobee thermostat and want occupancy sensing, HVAC-pausing on an open door, a longer warranty, and a higher-rated build. Budget for an ecobee Smart Security subscription for the full feature set.

Buy the Sonoff DW2-WIFI if you want a cheap, hub-free Wi-Fi sensor with broad integrations, low-battery alerts and history, and you are comfortable enabling the Wi-Fi b protocol to pair it. It suits budget DIY and Home Assistant setups.