Winner
Updated September 2026
Data from Amazon and official Shelly and Sonoff sites.
2026 verdict
In 2026, the recommendation leans toward Shelly Smart Plug UL over Sonoff WiFi Smart Plug S40 Lite, driven by maximum load power, Overheat/Overload protection, and energy monitoring.
It separates itself most clearly on maximum load power, Overheat/Overload protection, and energy monitoring, while still looking better on connectivity. Sonoff WiFi Smart Plug S40 Lite is the better fit only for buyers who prioritize price and rating above everything else here. That is why the final call still favors Shelly Smart Plug UL.
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| Feature | Shelly Smart Plug UL | Sonoff WiFi Smart Plug S40 Lite | Winner |
|---|---|---|---|
| Price | $24.99 | $11.99 | Sonoff WiFi Smart Plug S40 Lite |
| Rating | 4.1 | 4.2 | Sonoff WiFi Smart Plug S40 Lite |
| Maximum Load Power | 1800W | 1500W | Shelly Smart Plug UL |
| Overheat/Overload Protection | YES | NO | Shelly Smart Plug UL |
| Energy Monitoring | YES | NO | Shelly Smart Plug UL |
| Connectivity | 2.4 GHz WiFi, Bluetooth, Zigbee | 2.4 GHz WiFi, Bluetooth | Shelly Smart Plug UL |
| Weather Resistance | NO | NO | Tie |
| Plug Format | Type B | Type B | 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 |
Winner
- + Maximum Load Power: 1800W
- + Overheat/Overload Protection: YES
- + Energy Monitoring: YES
- - Price: $24.99 vs $11.99
- - Rating: 4.1 vs 4.2
- + Price: $11.99
- + Rating: 4.2
- - Maximum Load Power: 1500W vs 1800W
- - Overheat/Overload Protection: NO vs YES
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 Smart Plug UL
- Sonoff WiFi Smart Plug S40 Lite
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Frequently Asked Questions
Which is better overall: Shelly Smart Plug UL or Sonoff WiFi Smart Plug S40 Lite?
Shelly Smart Plug UL has the stronger overall profile in this comparison, especially for maximum load power, Overheat/Overload protection, and energy monitoring.
What is the biggest difference between Shelly Smart Plug UL and Sonoff WiFi Smart Plug S40 Lite?
Price is one of the clearest differences: Shelly Smart Plug UL lists $24.99, while Sonoff WiFi Smart Plug S40 Lite lists $11.99.
Which one looks better on price?
Shelly Smart Plug UL is listed at $24.99, while Sonoff WiFi Smart Plug S40 Lite is listed at $11.99. Sonoff WiFi Smart Plug S40 Lite (better spec).
Who should buy Shelly Smart Plug UL?
Choose Shelly Smart Plug UL if your priority is maximum load power and Overheat/Overload protection and that matters more than price.
Who should buy Sonoff WiFi Smart Plug S40 Lite?
Choose Sonoff WiFi Smart Plug S40 Lite if your priority is price and rating and that matters more than maximum load power.
Full comparison table
Compare all 36 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.
- 36 Plugs
- 31 specs compared
- 28 filters
ZoozSmart Plug ZEN04 800LR
$35.95
AmazonSmart Plug
48% OFF$24.99$12.98
PhilipsHue Smart plug (US)
$30.99
PhilipsHue Smart plug (EU)
23% OFF€34.99€26.99
SonoffiPlug Gen2 Type B Matter Over WiFi Smart Plug
$13.90
TP-LinkKasa EP40
31% OFF$24.99$17.28
GoveeSmart Plug Pro with Energy Monitoring
$16.99
YoLinkMini Plug
$19.99
YoLinkSmart Outdoor Energy Plug
15% OFF$32.98$27.99
GoveeSmart Plug Pro
10% OFF$12.99$11.68
TP-LinkTapo P125M
$11.99
AqaraSmart Plug (EU)
ShellyPlug M Gen3
$14.99
SonoffWiFi Smart Plug S60
SonoffiPlug Gen2 Type F Matter Over WiFi Smart Plug
$9.99
FibaroWall Plug (EU)
SonoffZigbee Smart Plug S40 Lite
$12.99
MerossOutdoor Smart Plug (3 Sockets)
10% OFF$30.99$27.89
MerossOutdoor Smart Plug
10% OFF$25.99$23.39
AqaraSmart Plug (US)
9% OFF$32.99$29.99
CamerasShellyCamera
DisplaysShellyWall Display X1i
DisplaysShellyWall Display XL
4.2(62)$349.99
DisplaysShellyWall Display
4.4(434)18% OFF€147.56€121.33
Door & Window SensorsShellyBLU Door/Window ZB
4.5(30)$22.99
Energy MonitorsShelly3EM-63W Gen3
4.6(137)
Energy MonitorsShellyEM Gen3
4.6(265)$69.99
Energy MonitorsShellyEM Gen4
Energy MonitorsShellyEM Mini Gen4
4.5(124)$24.99
Energy MonitorsShellyPro 3EM 3CT63
4.4(337)$150.99
Energy MonitorsShellyPro 3EM-400
4.2(20)$329.99
Energy MonitorsShellyPro 3EM v2
4.5(72)$154.99
Energy MonitorsShellyPro EM-50
4.6(946)$119.99
Gas DetectorsShellyGAS (CNG)
4.2(45)
Gas DetectorsShellyGAS (LPG)
LED BulbsShellyMulticolor Bulb E27 Gen3
4.2(29)
Motion SensorsShellyBLU Motion ZB
4.6(37)$26.99
Motion SensorsShellyBlu Motion
4.0(1,031)$25.99- PlugsShelly
Plug M Gen3
4.5(791)$14.99 
PlugsShellyPlug PM Gen3
Air Quality MonitorsSonoffSAWF-07P Air Quality Monitor
3.7(191)$39.90
Air Quality MonitorsSonoffSAWF-08P Air Quality Monitor
4.3(169)$49.90
CamerasSonoffCAM GlassView
4.6(18)$34.90
CamerasSonoffCam Outdoor DUO
$79.90
CamerasSonoffCam Slim Gen2
4.4(170)$19.90
CamerasSonoffGK-200MP2-B
4.0(149)30% OFF$9.99$6.99
DisplaysSonoffNSPanel Pro Gen2
3.4(11)€149.90
DisplaysSonoffNSPanel Pro
4.1(73)$129.90
DonglesSonoffDongle Lite MG21
4.5(439)$24.90
DonglesSonoffDongle Max
4.3(599)
DonglesSonoffDongle Plus MG24
4.7(675)$35.90
DonglesSonoffDongle Plus PP10
4.6(80)$35.90
DonglesSonoffDongle-PZG23
4.6(172)$39.90
DonglesSonoffZ-Wave 800 PoE Dongle Max
4.3(20)$44.90
DonglesSonoffZBDongle-E
4.6(3,724)$24.90
DonglesSonoffZBDongle-P
4.6(5,667)17% OFF$39.99$33.39
Door & Window SensorsSonoffDW2-WIFI
3.8(1,056)$12.23
Door & Window SensorsSonoffSNZB-04 ZigBee Wireless Door/Window Sensor
3.7(101)$17.99
Door & Window SensorsSonoffSNZB-04P ZigBee Door/Window Sensor
4.0(13)$18.99
Door & Window SensorsSonoffSenseGuard DW Gen2
4.4(192)