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Water Leak Sensors · Head to head

Shelly Flood Gen4 vs Switchbot Water Leak Detector (Sensor Cable Edition)

Full Smart Water Leak Sensors comparison in 2026

Updated September 2026
Data from Amazon and official Shelly and SwitchBot sites.
2026 verdict
Slid under a sink cabinet, the Shelly Flood Gen4 is the water leak sensor to pick when one device should speak Wi-Fi, Zigbee, Bluetooth and Matter.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99
Buy on Amazon USACheck price
It adds temperature and freeze alerts, a 3-year warranty, and a cable, and it lists Apple Home, Google Home and SmartThings. The Switchbot Water Leak Detector (Sensor Cable Edition) is the more affordable, better reviewed of the two, with a tighter IP67 seal against the Shelly's IP44. Both have a siren and a light. Pick the Shelly for a multi-protocol cabinet sensor, and the Switchbot when price, reviews and a tougher seal matter more than Matter.
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FeatureShelly Flood Gen4Switchbot Water Leak Detector (Sensor Cable Edition)Winner
Price$39.99$18.99Switchbot Water Leak Detector (Sensor Cable Edition)
Rating4.24.3Switchbot Water Leak Detector (Sensor Cable Edition)
Warranty3 years1 yearShelly Flood Gen4
Weather ResistanceIP44IP67Switchbot Water Leak Detector (Sensor Cable Edition)
Connectivity2.4 GHz WiFi, Bluetooth, Zigbee2.4 GHz WiFi, BluetoothShelly Flood Gen4
IntegrationsGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Apple HomeKit, Samsung SmartThings, Home AssistantShelly Flood Gen4
SensorsWater Leak, TemperatureWater LeakShelly Flood Gen4
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsWater Leak AlertsShelly Flood Gen4
Battery Life2 years2 yearsTie
On Device Alert SoundYESYESTie
On Device Alert LightYESYESTie

What the differences mean

How many radios

The Shelly Flood Gen4 lists 2.4 GHz Wi-Fi, Bluetooth, Zigbee and Matter together, plus Google Home, Apple Home, SmartThings and Home Assistant. Alexa is not listed. The Switchbot Water Leak Detector (Sensor Cable Edition) lists Wi-Fi and Bluetooth, plus Google Home, Apple Home, SmartThings and Home Assistant, and not Zigbee or Matter. Under one sink, the Shelly can move from Wi-Fi to Zigbee later without a new sensor.

Freeze alerts

The Shelly Flood Gen4 has a temperature sensor and temperature and freeze alerts. The Switchbot does not. A supply line that gets cold under the cabinet will only show up on the Shelly. Both still detect water once it pools, and both include a sensor cable for the trap or the valve.

Seal and batteries

The Switchbot is IP67 and rated for 2 years on two AAA cells. The Shelly Flood Gen4 is IP44 and rated for 2 years on four AA cells, in a larger 97 x 76 x 25 mm body. IP44 is splash resistance, not a soak. A cabinet that floods favors the Switchbot's seal. The Shelly's warranty is 3 years against 1 year on the Switchbot.

Local alarm

Both have an on-device sound and an on-device light, so this is not the deciding gap. Shelly owners like the buzzer and LED even with no app open, and they mention on-device automations that talk to other Shelly devices. Switchbot owners more often say the phone notification is what they actually hear once the sensor is behind a door. Low-battery alerts are documented on the Shelly and not documented on the Switchbot.

Which one to buy if

Winner
Shelly

Shelly Flood Gen4

$39.99
Buy on Amazon USACheck price
  • + Warranty: 3 years
  • + Connectivity: 2.4 GHz WiFi, Bluetooth, Zigbee
  • + Integrations: Google Home, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
  • - Price: $39.99 vs $18.99
  • - Rating: 4.2 vs 4.3

What owners say

Owners of the Shelly Flood Gen4 and owners of the Switchbot Water Leak Detector (Sensor Cable Edition) both like a cable that catches a drop in a place the body cannot sit, and both mention a local alarm. Shelly Flood Gen4 owners, especially on Home Assistant over Zigbee, single out fast pairing and a cable sensitive to a single drop, plus automations that can drive other Shelly gear. They complain that Wi-Fi onboarding is slow and that some Matter or Apple Home setups do not refresh until a button press. Switchbot Water Leak Detector (Sensor Cable Edition) owners single out hub-free Wi-Fi that finishes in minutes. They complain about a stiff battery hatch and a siren that is hard to hear through the cabinet door.

Price history compared

Every price change of both, in the same store, so the gap between the two lines is what one costs more than the other.

  • Shelly Flood Gen4
  • Switchbot Water Leak Detector (Sensor Cable Edition)

Loading price history...

Frequently Asked Questions

Shelly Flood Gen4 or Switchbot Water Leak Detector (Sensor Cable Edition): which belongs under a sink?

The Shelly Flood Gen4 if you want Wi-Fi, Zigbee, Bluetooth and Matter in one sensor, plus freeze alerts and a 3-year warranty. The Switchbot Water Leak Detector (Sensor Cable Edition) if you want the lower price, the better reviewed option, and an IP67 body. Both include a cable and both have a sound and a light.

Does the Shelly Flood Gen4 support Matter?

Yes. Matter is listed, along with Wi-Fi, Bluetooth and Zigbee. Apple Home, Google Home, SmartThings and Home Assistant are listed too. Alexa is not. The Switchbot Water Leak Detector (Sensor Cable Edition) does not list Matter or Zigbee.

Which seal is stronger?

The Switchbot Water Leak Detector (Sensor Cable Edition) at IP67. The Shelly Flood Gen4 is IP44. If the sensor itself may sit in water, the Switchbot is the one rated for it. The Shelly is fine for splashes in a cabinet.

Do both include a sensor cable?

Yes. The Shelly Flood Gen4 and the Switchbot Water Leak Detector (Sensor Cable Edition) both list an included sensor cable. Owners of the Shelly describe a cable that trips on a single drop.

Who should still buy the Switchbot Water Leak Detector (Sensor Cable Edition)?

Buyers who want a simpler Wi-Fi sensor, a lower price, IP67, and do not need Zigbee, Matter or a freeze alert under the sink.

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