Aqara Temperature and Humidity Sensor vs Nest Temperature Sensor (2nd gen)

The Aqara Temperature and Humidity Sensor wins overall. It measures humidity and pressure, costs less, works standalone with HomeKit, Google Home, Alexa, Home Assistant, IFTTT and Matter, and sends alerts. The Nest Temperature Sensor (2nd gen) is better rated with a longer battery life, but only works as a Nest Thermostat accessory.

The Aqara is a self-contained temperature, humidity and pressure sensor with broad integrations, while the Nest Temperature Sensor (2nd gen) has no radio of its own and only feeds room temperature to a compatible Nest Thermostat via Google Home.

The Nest Temperature Sensor (2nd gen) is rated around 3 years, slightly longer than the Aqara Temperature and Humidity Sensor's roughly 2 years. If minimizing battery swaps matters most, the Nest lasts a bit longer, but it is far more limited otherwise.

The Aqara does both. It measures temperature, humidity and atmospheric pressure and supports HomeKit, Google Home, Alexa, Home Assistant, IFTTT and Matter. The Nest Temperature Sensor (2nd gen) reads temperature only and integrates only with Google Home via a Nest Thermostat.

Buyers who want flexible, low-cost temperature and humidity monitoring across many rooms and hubs, including HomeKit, Home Assistant and Matter. Its broad support and full sensing make it the default choice.

Owners of a compatible Nest Thermostat who want a long-lasting sensor for room-specific comfort. Its 3-year battery is a plus, but it offers nothing outside the Nest ecosystem, and non-US buyers should confirm compatibility.