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Water Leak Sensors · Head to head

Arlo All-in-One Sensor vs Shelly Flood Gen4

Full Smart Water Leak Sensors comparison in 2026

Updated September 2026
Data from Amazon and official Arlo and Shelly sites.
2026 verdict
Small battery sensors that report a wet floor, yet the Shelly Flood Gen4 is the one that belongs in a mixed smart home.
Shelly Flood Gen4
Winner
Shelly Flood Gen4
$39.99
Buy on Amazon USACheck price
It speaks 2.4 GHz Wi-Fi, Bluetooth, Zigbee and Matter, reaches Apple Home, Google Home, SmartThings and Home Assistant, includes a sensor cable, and adds a local sound, a light, temperature and freeze alerts, with a 3-year warranty and an IP44 body on four AA cells rated for 2 years. The Arlo All-in-One Sensor packs leak, temperature, tilt and freeze into one puck for an Arlo Security System, and it works with Google Home, Alexa and SmartThings, but it has no local siren and no weather resistance. Buy the Shelly Flood Gen4 unless the house is already Arlo and tilt is the extra you want.
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FeatureArlo All-in-One SensorShelly Flood Gen4Winner
Price$24.99$39.99Arlo All-in-One Sensor
Rating4.04.2Shelly Flood Gen4
Warranty1 year3 yearsShelly Flood Gen4
Weather ResistanceNOIP44Shelly Flood Gen4
ConnectivityOther2.4 GHz WiFi, Bluetooth, ZigbeeShelly Flood Gen4
IntegrationsGoogle Home, Alexa, Samsung SmartThingsGoogle Home, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterShelly Flood Gen4
SensorsWater Leak, Temperature, TiltWater Leak, TemperatureArlo All-in-One Sensor
On Device Alert SoundNOYESShelly Flood Gen4
On Device Alert LightNOYESShelly Flood Gen4
AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature AlertsWater Leak Alerts, Temperature Alerts, Freeze Temperature Alerts, Low Battery AlertsTie

What the differences mean

Radios and platforms

The Shelly Flood Gen4 lists 2.4 GHz Wi-Fi, Bluetooth, Zigbee and Matter, plus Apple Home, Google Home, SmartThings and Home Assistant. Alexa is not supported. The Arlo All-in-One Sensor works only with an Arlo Security System, and it supports Google Home, Alexa and SmartThings. Apple Home and Matter are not supported. Home Assistant support is not documented for the Arlo sensor.

Cable, siren and weather

The Shelly Flood Gen4 includes a sensor cable, a sound and a light, and the body is IP44. The Arlo All-in-One Sensor has no cable, no sound and no light, and weather resistance is not supported, so it is an indoor puck that has to sit where the water will be. A leak behind a cabinet is a cable job. A dry cupboard shelf is not.

Tilt against a longer warranty

The Arlo All-in-One Sensor adds tilt on top of leak, temperature and freeze alerts. The Shelly Flood Gen4 has temperature and freeze alerts, including temperature alerts, but no tilt and no tamper alert. Warranty runs the other way: 3 years on the Shelly, 1 year on the Arlo. Battery life for the Arlo is not documented. The Shelly is rated for 2 years on four AA cells.

What has to be in the house already

The Arlo All-in-One Sensor does nothing useful without an Arlo Security System. The Shelly Flood Gen4 can join Wi-Fi, Zigbee, Bluetooth or Matter, so it does not demand that one security hub. If you are not already in Arlo, the Shelly is the sensor that can stand in a wider setup. If you are, the Arlo puck is the one that stays in that app.

Which one to buy if

What owners say

Owners notice different kinds of simplicity. Arlo All-in-One Sensor owners say it catches real leaks fast and installs in minutes inside an Arlo system, and they like having leak, freeze and tilt in one small puck. A vocal group reports uneven battery life and odd status flags after months, and the shared complaint is that nothing reports without an Arlo Security System hub, with no cable and no siren on the unit. Shelly Flood Gen4 owners, mostly on Home Assistant and Zigbee, describe a quick stable link and a cable sensitive enough that a single drop sets it off, plus a buzzer and LED that alert without the app. Their rough edge is Wi-Fi and Matter onboarding, which some call fiddly, including a HomeKit status that did not refresh until they pressed the button.

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.

  • Arlo All-in-One Sensor
  • Shelly Flood Gen4

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Frequently Asked Questions

Which is better overall: Arlo All-in-One Sensor or Shelly Flood Gen4?

The Shelly Flood Gen4 for almost any mixed smart home. It covers Wi-Fi, Zigbee, Bluetooth and Matter, includes a cable, and has a siren, a light, temperature and a 3-year warranty. The Arlo All-in-One Sensor wins only if you already have an Arlo system and want tilt as well as leak and freeze sensing.

What is the biggest difference between the Arlo All-in-One Sensor and the Shelly Flood Gen4?

The hub and the radios. The Arlo sensor requires an Arlo Security System and has no weather resistance and no siren. The Shelly Flood Gen4 works over Wi-Fi, Bluetooth, Zigbee and Matter, with an IP44 body, a cable, a sound and a light.

Does the Shelly Flood Gen4 work with Apple Home and Matter?

Yes. Apple Home and Matter are supported on the Shelly Flood Gen4, along with Google Home, SmartThings and Home Assistant. Alexa is not. The Arlo All-in-One Sensor does not support Apple Home or Matter. It does support Alexa, Google Home and SmartThings.

Which of the Arlo All-in-One Sensor and the Shelly Flood Gen4 senses tilt?

Only the Arlo All-in-One Sensor. It also senses temperature and sends freeze alerts. The Shelly Flood Gen4 senses temperature and sends temperature and freeze alerts, but tilt is not supported.

Who should buy the Arlo All-in-One Sensor?

Buy the Arlo All-in-One Sensor only when an Arlo Security System is already in the house and you want leak, freeze and tilt in one puck that also reaches Alexa. It has no cable and no local siren.

Who should buy the Shelly Flood Gen4?

Buy the Shelly Flood Gen4 for a cable, a local alarm, temperature and a choice of Wi-Fi, Zigbee or Matter, especially with Home Assistant. Battery life is rated at 2 years on four AA cells.

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