Environmental and contact sensors product notes

Best local leak, contact, and environmental sensors

Want the opinionated shortlist instead of the raw catalog? Start with the category guide, then come back here for device-by-device caveats.

Compare environmental and contact sensors

Need a side-by-side view of setup difficulty, local control, cloud dependency, and ecosystem fit? Use the comparison matrix for this category.

AirGradient One

AirGradient · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: wifi
• Best for: Home Assistant users who want accurate, local indoor air quality data with CO2 readings

AirGradient Open Air

AirGradient · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: moderate
• Protocols: wifi
• Best for: Home Assistant users in areas affected by wildfire smoke or urban air pollution

Apollo AIR-1 Air Quality Sensor

Apollo Automation · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: wifi, esp-home
• Best for: Home Assistant users who want comprehensive indoor air quality data for health-conscious automations

Apollo PLT-1 Plant Sensor

Apollo Automation · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: wifi, esp-home
• Best for: Home Assistant users who want to automate plant watering based on actual soil moisture data

Aqara Climate Sensor W100

Aqara · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: matter, thread
• Best for: Home Assistant users who want cheap, local climate sensors for every room

Aqara Door and Window Sensor P2

Aqara · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: Zigbee-based Home Assistant setups needing reliable door/window sensors

Aqara Motion and Light Sensor P2

Aqara · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: matter, thread
• Best for: Thread-based Home Assistant setups that want simple, reliable motion triggers

Aqara TVOC Air Quality Monitor

Aqara · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: monitoring indoor air quality trends alongside temperature and humidity

Eve Door & Window

Eve · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: matter, thread
• Best for: privacy-conscious buyers who want a no-cloud contact sensor

Eve Motion

Eve · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: matter, thread
• Best for: privacy-conscious buyers who want a no-cloud motion sensor for indoor or sheltered outdoor use

Eve Room

Eve · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: thread, matter, bluetooth
• Best for: privacy-conscious users who want indoor air quality monitoring with zero cloud involvement

Eve Weather

Eve · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: matter, thread
• Best for: Home Assistant users who want local outdoor climate data for automations

Heiman Smart Carbon Monoxide Alarm

Heiman · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: matter, thread
• Best for: users who want a cross-platform smart CO alarm with local-only operation

Heiman Water Leak Sensor

Heiman · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: matter, thread
• Best for: budget-conscious users who want Matter leak sensors deployed in multiple locations

HomeWizard P1 Meter

HomeWizard · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: wifi
• Best for: Dutch and Belgian homeowners who want real-time energy data in Home Assistant

Shelly BLU Door/Window

Shelly · local control: good · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: bluetooth
• Best for: Home Assistant users with a Shelly BLU gateway who want cheap, reliable door and window sensors

Shelly BLU Motion

Shelly · local control: good · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: bluetooth
• Best for: Home Assistant users building motion-activated lighting or presence-based automations on a budget

Shelly H&T Gen3

Shelly · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: wifi, mqtt, bluetooth
• Best for: Home Assistant users who want a standalone temperature and humidity sensor with a readable display

Shelly Plus PM Mini Gen3

Shelly · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: moderate
• Protocols: wifi, mqtt, bluetooth
• Best for: Home Assistant users who want per-circuit energy monitoring without adding switching capability

SONOFF SNZB-02D

SONOFF · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: zigbee
• Best for: Home Assistant users wanting cheap, reliable temp/humidity monitoring

SONOFF SNZB-03P

SONOFF · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: zigbee
• Best for: Home Assistant users building motion-activated lighting automations on a budget

SONOFF SNZB-04P

SONOFF · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: zigbee
• Best for: Home Assistant users who want to monitor every door and window cheaply

SONOFF SNZB-06P Zigbee Occupancy Sensor

SONOFF · local control: excellent · cloud: none

• Home Assistant: good
• Setup: moderate
• Protocols: zigbee
• Best for: budget presence detection for lights-on-when-occupied automations

SwitchBot Contact Sensor

SwitchBot · local control: good · cloud: medium

• Home Assistant: good
• Setup: easy
• Protocols: bluetooth, matter
• Best for: SwitchBot ecosystem users who want affordable door and window sensors

SwitchBot Leak Detector

SwitchBot · local control: good · cloud: medium

• Home Assistant: good
• Setup: easy
• Protocols: bluetooth, matter
• Best for: placing under sinks, near water heaters, and in basements for early leak detection

SwitchBot Meter Pro CO2

SwitchBot · local control: good · cloud: medium

• Home Assistant: good
• Setup: easy
• Protocols: bluetooth, matter
• Best for: indoor air quality monitoring with Home Assistant automations

Third Reality Water Leak Sensor

Third Reality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: budget water leak monitoring under sinks, water heaters, and washing machines

ThirdReality Door Sensor

ThirdReality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: blanketing your home with door and window sensors on a budget

ThirdReality Garage Door Tilt Sensor

ThirdReality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: knowing whether your garage door is open or closed from within Home Assistant

ThirdReality Motion Sensor (Matter)

ThirdReality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: matter, wifi
• Best for: Home Assistant users who want Matter-native motion sensing without a Zigbee coordinator

ThirdReality Motion Sensor R1

ThirdReality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: budget motion-activated lighting automations

ThirdReality Smart Soil Moisture Sensor

ThirdReality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: automating garden watering based on actual soil conditions

ThirdReality Temperature and Humidity Sensor

ThirdReality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: room-by-room climate monitoring in a Zigbee Home Assistant setup

ThirdReality Temperature Sensor Lite

ThirdReality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: deploying cheap temperature sensors in every room for whole-home climate tracking

ThirdReality Vibration Sensor

ThirdReality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: detecting when the washer or dryer finishes running

ThirdReality Zigbee Water Leak Sensor

Third Reality · local control: excellent · cloud: none

• Home Assistant: good
• Setup: easy
• Protocols: zigbee
• Best for: scattering cheap leak detectors under sinks, water heaters, and washing machines

Zooz ZSE11 Q Sensor

Zooz · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: z-wave
• Best for: rooms where you want motion-activated lighting plus environmental monitoring in one device

Zooz ZSE18 Motion Sensor

Zooz · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: z-wave
• Best for: hallway or closet light automation where you just need motion detection

Zooz ZSE42 Water Leak XS Sensor

Zooz · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: z-wave
• Best for: under sinks, water heaters, washing machines, and anywhere pipes can leak

Zooz ZSE43 Tilt/Shock XS Sensor

Zooz · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: z-wave
• Best for: garage door open/close monitoring without wired sensors

Zooz ZSE44 Temp/Humidity XS Sensor

Zooz · local control: excellent · cloud: none

• Home Assistant: excellent
• Setup: easy
• Protocols: z-wave
• Best for: monitoring temperature and humidity in wine cellars, server rooms, crawl spaces, or greenhouses