Winner
Updated October 2026
Data from Amazon and official Sonoff site.
2026 verdict
These two Sonoff plugs look alike but do different jobs, and the Sonoff WiFi Smart Plug S40 is the better fit for most homes.
It connects over Wi-Fi with no hub, monitors energy in real time and adds overheat and overload protection, while the Sonoff Zigbee Smart Plug S40 Lite has neither energy monitoring nor overload protection and needs a Zigbee hub to work at all. What the Zigbee model offers is a place in a Zigbee mesh: it acts as a router that extends range to distant sensors, which is why Home Assistant and Zigbee2MQTT owners buy it. Both share the same eWeLink app and both fall short of Apple Home or Matter without a Sonoff hub. Pick the Sonoff WiFi Smart Plug S40 for a standalone, energy-monitoring outlet, and the Sonoff Zigbee Smart Plug S40 Lite to strengthen a Zigbee network while adding a switchable socket.
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| Feature | Sonoff WiFi Smart Plug S40 | Sonoff Zigbee Smart Plug S40 Lite | Winner |
|---|---|---|---|
| Price | $10.90 | $12.99 | Sonoff WiFi Smart Plug S40 |
| Rating | 4.2 | 4.5 | Sonoff Zigbee Smart Plug S40 Lite |
| Overheat/Overload Protection | YES | NO | Sonoff WiFi Smart Plug S40 |
| Energy Monitoring | YES | NO | Sonoff WiFi Smart Plug S40 |
| Connectivity | 2.4 GHz WiFi, Bluetooth | Zigbee | Sonoff WiFi Smart Plug S40 |
| Zigbee Router | NO | YES | Sonoff Zigbee Smart Plug S40 Lite |
| Warranty | 1 year | 1 year | Tie |
| Weather Resistance | NO | NO | Tie |
| Plug Format | Type B | Type B | Tie |
| Maximum Load Power | 1800W | 1800W | Tie |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Tie |
| On/Off Button | YES | YES | Tie |
What the differences mean
Wi-Fi or Zigbee
The Sonoff WiFi Smart Plug S40 connects straight to your Wi-Fi network, so it works on its own with no hub. The Sonoff Zigbee Smart Plug S40 Lite has no Wi-Fi or Bluetooth and needs a Zigbee hub, such as a Sonoff Zigbee Bridge or a compatible coordinator, before it will do anything.
Energy monitoring and protection
The Sonoff WiFi Smart Plug S40 reports real-time and historical energy use and adds overheat and overload protection. The Sonoff Zigbee Smart Plug S40 Lite has neither, so it cannot tell you what an appliance costs to run and offers no built-in protection against a fault.
Extending a Zigbee mesh
The Sonoff Zigbee Smart Plug S40 Lite works as a Zigbee router, repeating the signal to sensors and switches far from the coordinator, which is the main reason buyers add it. The Sonoff WiFi Smart Plug S40 joins your Wi-Fi and does not extend a Zigbee network.
Smart home platforms
Both plugs work through the eWeLink app with Alexa and Google Home, and the Wi-Fi model also supports SmartThings and Home Assistant. Neither reaches Apple Home or Matter without a Sonoff hub that bridges it, and neither has a USB port or weather resistance.
Which one to buy if
- you want an energy-monitoring plug with no hub
The Sonoff WiFi Smart Plug S40 connects over Wi-Fi on its own and tracks real-time and historical power use.
- you need to extend Zigbee range to a shed or outbuilding
The Sonoff Zigbee Smart Plug S40 Lite repeats the Zigbee signal as a router, which is what distant sensors need.
- you already run Home Assistant with a Zigbee coordinator
The Sonoff Zigbee Smart Plug S40 Lite pairs quickly with Zigbee2MQTT setups and adds a switchable outlet to the mesh.
- you want overload protection on a high-draw appliance
Only the Sonoff WiFi Smart Plug S40 carries overheat and overload protection of the two.
Winner
- + Price: $10.90
- + Overheat/Overload Protection: YES
- + Energy Monitoring: YES
- - Rating: 4.2 vs 4.5
- - Zigbee Router: NO vs YES
- + Rating: 4.5
- + Zigbee Router: YES
- - Price: $12.99 vs $10.90
- - Overheat/Overload Protection: NO vs YES
What owners say
Owners of both plugs bought into the same Sonoff ecosystem, and their experiences split along connectivity. Sonoff WiFi Smart Plug S40 owners value the real-time and historical energy monitoring, the ability to handle larger loads and the configurable power-on behaviour after an outage, but a notable share report units that lost Wi-Fi or failed after two or three months, and readings can drift at very low draws. Sonoff Zigbee Smart Plug S40 Lite owners describe pairing as fast and often automatic with Home Assistant and Zigbee2MQTT, and several bought multiple units purely as repeaters to reach sheds and outbuildings; a few on SmartThings hubs report pairing trouble, and one longer-term user had a unit stop responding.
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.
- Sonoff WiFi Smart Plug S40
- Sonoff Zigbee Smart Plug S40 Lite
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Frequently Asked Questions
Which is better overall: Sonoff WiFi Smart Plug S40 or Sonoff Zigbee Smart Plug S40 Lite?
For most homes the Sonoff WiFi Smart Plug S40 is the better plug. It works without a hub, monitors energy and adds overload protection. The Sonoff Zigbee Smart Plug S40 Lite is the better choice only inside a Zigbee network, where it doubles as a range extender, since on its own it needs a hub and has no energy monitoring.
Does the Sonoff Zigbee Smart Plug S40 Lite need a hub?
Yes. The Sonoff Zigbee Smart Plug S40 Lite has no Wi-Fi or Bluetooth and will not work standalone; it needs a Zigbee hub or coordinator such as a Sonoff Zigbee Bridge or dongle. The Sonoff WiFi Smart Plug S40 needs no hub at all.
Does the Sonoff WiFi Smart Plug S40 monitor energy?
Yes. The Sonoff WiFi Smart Plug S40 reports real-time and historical energy use and adds overheat and overload protection, while the Sonoff Zigbee Smart Plug S40 Lite has no energy monitoring and no overload protection.
What is the biggest difference between the Sonoff WiFi Smart Plug S40 and the Sonoff Zigbee Smart Plug S40 Lite?
Connectivity and what it brings. The Sonoff WiFi Smart Plug S40 is a standalone Wi-Fi plug with energy monitoring and overload protection, while the Sonoff Zigbee Smart Plug S40 Lite is a Zigbee router that needs a hub and focuses on extending mesh range instead of measuring power.
Who should buy the Sonoff WiFi Smart Plug S40?
Anyone who wants a plug that works without a hub, tracks what an appliance costs to run, handles larger loads with overload protection and fits Alexa, Google Home, SmartThings or Home Assistant.
Who should buy the Sonoff Zigbee Smart Plug S40 Lite?
Home Assistant and Zigbee2MQTT users with an existing Zigbee hub who want a cheap switchable outlet that also strengthens the mesh, especially to reach outbuildings, sheds or distant sensors.
Full comparison table
Compare all 37 Plugs side by side
You are looking at two of them. The full table lines up all Plugs in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
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