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Environmental and contact sensors comparisons

Leak, contact, and environmental sensors worth installing in a local-first home.

Read the buying guide → All environmental and contact sensors →

Standout picks

Strongest overall pick

AirGradient ONE

AirGradient · HA: excellent · local: excellent

true NDIR CO2 sensor alongside PM2.5, temperature, and humidity, not just VOC estimation

Product notes →

Also strong on local control

AirGradient Open Air

AirGradient · works offline: yes

Open-source hardware with ESPHome firmware. Fully local operation, no cloud account or external data sharing required.

Why it stands out →

Another easy starting point

Apollo AIR-1 Air Quality Sensor

Apollo Automation · setup: easy

Home Assistant users who want comprehensive indoor air quality data for health-conscious automations

See buyer notes →

All environmental and contact sensors, side by side

Filter, sort, and open "More" on any row for what it's best at, setup, power, and cloud posture. Prices are the last verified read where there is one; the rest show a price band.

Showing 58 of 58 Ordered by Home Assistant fit, then local control. Click a column heading to re-sort.

Environmental and contact sensors compared: Home Assistant fit, offline behavior, protocols, hub requirement, price, and where to buy.
						Where to buy
AirGradient ONE AirGradient More Best for Home Assistant users who want accurate, local indoor air quality data with CO2 readings Standout Open-source indoor air quality monitor with true NDIR CO2 sensing and ESPHome compatibility. Local control excellent Cloud local-first (none) Setup easy Power usb	excellent	yes	Wi-Fi	no	mid	AirGradient ↗
AirGradient Open Air AirGradient More Best for Home Assistant users in areas affected by wildfire smoke or urban air pollution Standout Open-source outdoor air quality monitor with PM particulate tracking and ESPHome integration. Local control excellent Cloud local-first (none) Setup moderate Power usb	excellent	yes	Wi-Fi	no	premium	AirGradient ↗
Apollo AIR-1 Air Quality Sensor Apollo Automation More Best for Home Assistant users who want comprehensive indoor air quality data for health-conscious automations Standout All-in-one air quality sensor covering PM2.5, VOC, NOx, temperature, and humidity (with optional NDIR CO2), fully local via ESPHome. Local control excellent Cloud local-first (none) Setup easy Power usb	excellent	yes	Wi-Fi, ESPHome, Bluetooth	no	mid	Apollo Automation ↗
Apollo PLT-1 Plant Sensor Apollo Automation More Best for Home Assistant users who want to automate plant watering based on actual soil moisture data Standout Budget ESPHome plant sensor measuring soil moisture, air temperature and humidity, light (lux) and UV, plus an optional soil-temperature probe, fully local. Local control excellent Cloud local-first (none) Setup easy Power usb	excellent	yes	Wi-Fi, ESPHome	no	budget	Apollo Automation ↗
Aqara Motion Sensor P1 Aqara Owned and reviewed More Best for Zigbee Home Assistant setups wanting motion plus light level with a tunable cooldown Standout Zigbee PIR motion and light sensor with a configurable detection lockout and very long battery life. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Zigbee	yes	$20.99checked Sep 14	Amazon ↗ *
Aqara Temperature and Humidity Sensor Aqara Owned and reviewed More Best for Zigbee Home Assistant setups wanting cheap room climate monitoring Standout Tiny, very cheap Zigbee sensor that reports temperature, humidity and atmospheric pressure. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Zigbee	yes	$18.98checked Sep 14	Amazon ↗ *
HomeWizard P1 Meter HomeWizard More Best for Dutch and Belgian homeowners who want real-time energy data in Home Assistant Standout Reads real-time energy data from Dutch/Belgian P1 smart meters with a fully local API. Local control excellent Cloud local-first (none) Setup easy Power usb	excellent	yes	Wi-Fi	no	mid	HomeWizard ↗
Shelly Flood Gen4 Shelly Owned and reviewed More Best for protecting water heaters, washing machines and under-sink areas with local leak alerts Standout Multi-protocol leak sensor (WiFi, Bluetooth, Zigbee, Matter) with an extendable leak detection cable, fully local. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Wi-Fi, Bluetooth, Zigbee, Matter	no	$39.99checked Sep 10	Amazon ↗ *
Shelly H&T Gen3 Shelly More Best for Home Assistant users who want a standalone temperature and humidity sensor with a readable display Standout Battery-powered WiFi sensor with an e-ink display that shows temperature and humidity without needing an app. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Wi-Fi, MQTT, Bluetooth	no	$40.99checked Sep 10	Amazon ↗ *
Shelly Plus PM Mini Shelly More Best for Home Assistant users who want per-circuit energy monitoring without adding switching capability Standout Pure power monitoring in a tiny inline package - tracks watts, voltage, and energy consumption without switching. Local control excellent Cloud local-first (none) Setup moderate Power hardwired	excellent	yes	Wi-Fi, MQTT, Bluetooth	no	$14.49checked Sep 10	Amazon ↗ *
Shelly Pro 3EM (3x120A Energy Meter) Shelly More Best for Whole-home energy monitoring on the Home Assistant Energy dashboard, fully local Standout A DIN-rail 3-phase energy meter with a local HTTP/RPC + MQTT API and a top-tier Home Assistant integration that feeds the Energy dashboard directly - no cloud. Local control excellent Cloud local-first (none) Setup hard Power AC-powered	excellent	yes	Wi-Fi, Ethernet, Bluetooth, Matter	no	$153.33checked Sep 6	Amazon ↗ *
Shelly Wave H&T Shelly More Best for Z-Wave Home Assistant networks wanting reliable room climate monitoring Standout Battery-powered Z-Wave temperature and humidity sensor with full local control via Z-Wave JS. Local control excellent Cloud local-first (none) Setup moderate Power battery	excellent	yes	Z-Wave	yes	budget	Shelly ↗
SONOFF SNZB-02D SONOFF More Best for Home Assistant users wanting cheap, reliable temp/humidity monitoring Standout Integrated LCD with local Zigbee telemetry for both visible and automated climate monitoring. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Zigbee	yes	$15.90checked Sep 6	Amazon ↗ *
SONOFF SNZB-03P SONOFF More Best for Home Assistant users building motion-activated lighting automations on a budget Standout One of the cheapest Zigbee motion sensors available, making whole-house motion detection affordable. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Zigbee	yes	$16.50checked Sep 6	Amazon ↗ *
SONOFF SNZB-04P SONOFF More Best for Home Assistant users who want to monitor every door and window cheaply Standout One of the cheapest Zigbee contact sensors on the market, making it practical to cover every door and window. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Zigbee	yes	budget	Amazon ↗ *
Zooz ZSE11 Q Sensor Zooz More Best for rooms where you want motion-activated lighting plus environmental monitoring in one device Standout Four-in-one Z-Wave sensor: motion, temperature, humidity, and light level in a single compact device. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Z-Wave	yes	$46.95checked Sep 5	Amazon ↗ *
Zooz ZSE18 Motion Sensor Zooz More Best for hallway or closet light automation where you just need motion detection Standout Compact, affordable Z-Wave PIR motion sensor with magnetic mount and micro-USB power option. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Z-Wave	yes	$37.95checked Sep 9	Amazon ↗ *
Zooz ZSE42 Water Leak XS Sensor Zooz More Best for under sinks, water heaters, washing machines, and anywhere pipes can leak Standout Tiny water leak sensor that fits anywhere pipes run. Pair with a Z-Wave valve actuator for automated shutoff. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Z-Wave	yes	$39.95checked Sep 5	Amazon ↗ *
Zooz ZSE43 Tilt/Shock XS Sensor Zooz More Best for garage door open/close monitoring without wired sensors Standout Stick-on tilt and shock sensor for garage doors, cabinets, and gates. No wiring needed. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Z-Wave	yes	budget	Zooz ↗
Zooz ZSE44 Temp/Humidity XS Sensor Zooz More Best for monitoring temperature and humidity in wine cellars, server rooms, crawl spaces, or greenhouses Standout Tiny Z-Wave temperature and humidity sensor. Stick it anywhere for local environmental monitoring. Local control excellent Cloud local-first (none) Setup easy Power battery	excellent	yes	Z-Wave	yes	$44.95checked Sep 5	Amazon ↗ *
Aeotec TriSensor (ZWA005) Aeotec More Best for Z-Wave households wanting a small local motion + temp + lux sensor Standout A compact Z-Wave Plus multisensor - motion, temperature and light in one 45mm body - with S2 security, running fully local through Z-Wave JS. Local control excellent Cloud local-first (none) Setup moderate Power battery	good	yes	Z-Wave	yes	mid	Aeotec ↗
Aeotec TriSensor 8 (ZWA045) Aeotec More Best for Z-Wave households wanting a small local motion + temp + lux sensor on current-generation silicon Standout The 800-series refresh of the compact TriSensor - motion, temperature and light in one small body, adding SmartStart onboarding, S2 security and Z-Wave Long Range. Local control excellent Cloud local-first (none) Setup moderate Power battery	good	yes	Z-Wave	yes	$39.99checked Sep 8	Amazon ↗ *
Aqara Climate Sensor W100 Aqara More Best for Home Assistant users who want cheap, local climate sensors for every room Standout Temperature and humidity sensor with a 3.4-inch LCD and three programmable buttons, running Matter over Thread or Zigbee 3.0 on any ZHA / Zigbee2MQTT coordinator - no Aqara hub, fully local. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Matter, Thread, Zigbee	yes	$39.99checked Sep 8	Amazon ↗ *
Aqara Door and Window Sensor P2 Aqara More Best for Matter-and-Thread Home Assistant setups wanting a reliable door/window sensor Standout Long-battery contact sensing as a native Matter-over-Thread device for hubless, cross-ecosystem integration. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Thread, Matter	yes	$27.99checked Sep 14	Amazon ↗ *
Aqara Motion and Light Sensor P2 Aqara More Best for Thread-based Home Assistant setups that want simple, reliable motion triggers Standout Thread-native motion and light sensor with no hub requirement and full local control. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Matter, Thread	yes	$33.99checked Sep 7	Amazon ↗ *
Aqara TVOC Air Quality Monitor Aqara More Best for monitoring indoor air quality trends alongside temperature and humidity Standout Three-in-one TVOC, temperature, and humidity sensor with an always-on e-ink display. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	mid	Aqara ↗
Aqara Vibration Sensor Aqara More Best for detecting when a washer, dryer or other appliance is running via vibration Standout Zigbee accelerometer sensor that detects vibration, tilt and drop, fully local. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$19.99checked Sep 7	Amazon ↗ *
Eve Door & Window Eve More Best for privacy-conscious buyers who want a no-cloud contact sensor Standout Privacy-first Thread contact sensor with zero cloud dependency. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Matter, Thread	no	$31.80checked Aug 31	Amazon ↗ *
Eve Motion Eve More Best for privacy-conscious buyers who want a no-cloud motion sensor for indoor or sheltered outdoor use Standout Privacy-first Thread motion sensor with IPX3 weather resistance for indoor and sheltered outdoor use. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Matter, Thread	no	mid	Eve ↗
Eve Room Eve More Best for privacy-conscious users who want indoor air quality monitoring with zero cloud involvement Standout A fully local indoor air quality monitor with an e-ink display, no cloud account, and zero data collection by the vendor. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Thread, Bluetooth	yes	premium	not listed
Eve Weather Eve More Best for Home Assistant users who want local outdoor climate data for automations Standout Outdoor-rated Thread weather sensor with temperature, humidity, and barometric pressure, all fully local. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Matter, Thread	no	$184.13checked Sep 8	Eve ↗
frient Air Quality Sensor frient More Best for Home Assistant users who want to automate ventilation based on indoor air quality Standout Zigbee air quality sensor covering VOC, temperature, and humidity for ventilation automations. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$79.95checked Sep 7	Amazon ↗ *
frient Electricity Meter Interface frient More Best for Home Assistant users who want whole-home energy monitoring without modifying their electrical panel Standout Non-invasive whole-home energy monitoring by reading your electricity meter's LED pulse. Local control excellent Cloud local-first (none) Setup moderate Power battery	good	yes	Zigbee	yes	$49checked Sep 7	Amazon ↗ *
frient Entry Sensor 2 Pro frient More Best for EU users building a Zigbee-based security and automation setup Standout Well-designed Zigbee door and window sensor with reliable, fast open/close detection. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$43.95checked Sep 21	Amazon ↗ *
frient Motion Sensor Pro frient More Best for EU-based users wanting a reliable multi-sensor for automation triggers Standout Combines motion, light level, and temperature sensing in one compact Zigbee device. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	mid	Frient ↗
frient Water Leak Detector frient More Best for Home Assistant users protecting kitchens, bathrooms, and basements from water damage Standout Compact Zigbee water leak sensor with a built-in 85 dB siren and fully local operation. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	mid	Frient ↗
Heiman Water Leak Sensor Heiman More Best for budget-conscious Home Assistant users who want Zigbee leak sensors deployed in multiple locations Standout Affordable Zigbee water leak sensor that runs fully local through Home Assistant via Zigbee2MQTT or ZHA. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	budget	Heiman ↗
IKEA ALPSTUGA Air Quality Monitor IKEA Owned and reviewed More Best for Matter and Thread Home Assistant setups that want affordable CO2 and particulate monitoring Standout Affordable Matter over Thread air quality monitor covering CO2, PM2.5, temperature and humidity. Local control excellent Cloud local-first (none) Setup easy Power usb	good	yes	Matter, Thread	no	budget	IKEA ↗
IKEA MYGGSPRAY Wireless Motion Sensor IKEA More Best for Matter and Thread Home Assistant setups wanting low-cost motion triggers Standout One of the cheapest Matter over Thread motion sensors, with no hub requirement. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Matter, Thread	no	budget	IKEA ↗
IKEA Timmerflotte IKEA Owned and reviewed More Best for Matter/Thread households wanting cheap room-by-room temp/humidity with a screen Standout Cheap Matter-over-Thread temp + humidity sensor with a built-in display, readable without an app. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Thread, Matter	yes	budget	IKEA ↗
SONOFF SNZB-02P SONOFF More Best for Zigbee2MQTT users who want a cheap, accurate climate sensor in every room Standout Swiss-made sensing element rated at plus or minus 0.2 C and 2 percent RH, in a sensor that costs about as much as a coin cell and a coffee. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	budget	SONOFF ↗
SONOFF SNZB-06P Zigbee Occupancy Sensor SONOFF Owned and reviewed More Best for budget presence detection for lights-on-when-occupied automations Standout Budget mmWave presence detection over Zigbee - detects people sitting still, not just walking by. Local control excellent Cloud local-first (none) Setup moderate Power USB-powered	good	yes	Zigbee	yes	budget	Amazon ↗ *
Third Reality Water Leak Sensor ThirdReality More Best for budget water leak monitoring under sinks, water heaters, and washing machines Standout Cheap and reliable Zigbee water leak detection - scatter several around your home to catch leaks early. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$20.99checked Sep 13	Amazon ↗ *
ThirdReality Door Sensor ThirdReality More Best for blanketing your home with door and window sensors on a budget Standout Low-cost Zigbee contact sensing that scales well across many doors and windows. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$17.99checked Sep 10	Amazon ↗ *
ThirdReality Garage Door Tilt Sensor ThirdReality More Best for knowing whether your garage door is open or closed from within Home Assistant Standout Cheap Zigbee tilt sensor purpose-built for garage door open/close monitoring. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$19.99checked Sep 12	Amazon ↗ *
ThirdReality Motion Sensor ThirdReality More Best for budget motion-activated lighting automations Standout Budget Zigbee PIR sensor with dependable trigger speed for lighting automations. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$19.99checked Sep 6	Amazon ↗ *
ThirdReality Smart Night Light-T (Matter over Thread) ThirdReality More Best for hallways, bathrooms and nurseries that want a Thread-native night light with motion-triggered automations Standout Matter-over-Thread night light with built-in motion and illumination sensors. No ThirdReality hub needed. Local control excellent Cloud local-first (none) Setup easy Power plug-in	good	yes	Matter, Thread	no	$29.99checked Sep 12	Amazon ↗ *
ThirdReality Smart Soil Moisture Sensor ThirdReality More Best for automating garden watering based on actual soil conditions Standout Zigbee soil moisture and temperature sensing for smart garden automations. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	budget	Amazon ↗ *
ThirdReality Temperature and Humidity Sensor ThirdReality More Best for room-by-room climate monitoring in a Zigbee Home Assistant setup Standout Zigbee temp and humidity sensor with a small LCD, running on easy-to-stock AAA batteries instead of coin cells. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$24.99checked Sep 6	Amazon ↗ *
ThirdReality Temperature Sensor Lite ThirdReality More Best for deploying cheap temperature sensors in every room for whole-home climate tracking Standout Display-free Zigbee temperature and humidity sensor on AAA batteries. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$19.99checked Sep 6	Amazon ↗ *
ThirdReality Vibration Sensor ThirdReality More Best for detecting when the washer or dryer finishes running Standout Cheap vibration and tilt detection for creative home automations. Local control excellent Cloud local-first (none) Setup easy Power battery	good	yes	Zigbee	yes	$19.99checked Sep 13	Amazon ↗ *
Shelly BLU Door/Window Shelly More Best for Home Assistant users with a Shelly BLU gateway who want cheap, reliable door and window sensors Standout Ultra-cheap Bluetooth door/window sensor that works fully local through a Shelly BLU gateway or BLE proxy. Local control good Cloud local-first (none) Setup easy Power battery	good	yes	Bluetooth	yes	$19.99checked Sep 3	Amazon ↗ *
Shelly BLU Motion Shelly More Best for Home Assistant users building motion-activated lighting or presence-based automations on a budget Standout Budget Bluetooth motion sensor with lux sensing that reaches Home Assistant over BTHome, with no vendor hub in the path. Local control good Cloud local-first (none) Setup easy Power battery	good	yes	Bluetooth	yes	budget	Amazon ↗ *
SwitchBot Contact Sensor SwitchBot More Best for SwitchBot ecosystem users who want affordable door and window sensors Standout Budget contact sensor with bonus motion detection and a path to Matter via Hub. Local control good Cloud cloud-tinged (low) Setup easy Power battery	good	yes	Bluetooth, Matter	no	$16.99checked Sep 10	Amazon ↗ *
SwitchBot Leak Detector SwitchBot More Best for placing under sinks, near water heaters, and in basements for early leak detection Standout Affordable Wi-Fi/Bluetooth water leak detector; reaches Matter through the SwitchBot Hub 2. Local control good Cloud cloud-tinged (low) Setup easy Power battery	good	yes	Bluetooth, Wi-Fi, Matter	no	$16.99checked Sep 12	Amazon ↗ *
SwitchBot Meter Pro CO2 SwitchBot More Best for indoor air quality monitoring with Home Assistant automations Standout Combined temperature, humidity, and CO2 monitor with LCD display; reaches Home Assistant locally over Bluetooth, and gains Matter only when a SwitchBot hub bridges it. Local control good Cloud cloud-tinged (low) Setup easy Power battery	good	yes	Bluetooth, Matter	no	$59.49checked Sep 6	Amazon ↗ *
IKEA VINDSTYRKA Air Quality Sensor IKEA Discontinued More Best for Local-first homes wanting affordable PM2.5 + VOC data on ZHA or Zigbee2MQTT Standout Packs a real Sensirion SEN54 module with active fan and front display, exposing PM2.5, temperature, humidity and a VOC index over Zigbee for about $50. Local control excellent Cloud local-first (none) Setup easy Power USB-powered	good	yes	Zigbee	yes	mid	IKEA ↗
Emporia Vue 3 (Home Energy Monitor) Emporia More Best for North American split-phase panels where you want per-circuit detail, not just the mains Standout Branch-circuit monitoring at a low price, with an ESP32 inside that can be reflashed with ESPHome for fully local Home Assistant sensors. Local control fair Cloud cloud-heavy (high) Setup advanced Power hardwired	okay	no	Wi-Fi, Ethernet	no	$199.99checked Sep 21	Amazon ↗ *