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Plugs · Head to head

Sonoff S31 WiFi Smart Plug vs Sonoff WiFi Smart Plug S40 Lite

Full Smart Plugs comparison in 2026

Updated August 2026
Data from Amazon and official Sonoff site.
2026 verdict
Sonoff S31 WiFi Smart Plug wins the 2026 matchup against Sonoff WiFi Smart Plug S40 Lite, mainly on price, maximum load power, and energy monitoring.
Sonoff S31 WiFi Smart Plug
Winner
Sonoff S31 WiFi Smart Plug
$10.90
Buy on Amazon USACheck price
The main reason it wins is price, maximum load power, and energy monitoring, and its broader overall balance strengthens that case. The only strong reason to choose Sonoff WiFi Smart Plug S40 Lite is if rating and connectivity are more important to you than the overall verdict. That makes Sonoff S31 WiFi Smart Plug the clearer recommendation in 2026.
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FeatureSonoff S31 WiFi Smart PlugSonoff WiFi Smart Plug S40 LiteWinner
Price$10.90$11.99Sonoff S31 WiFi Smart Plug
Rating4.14.2Sonoff WiFi Smart Plug S40 Lite
Maximum Load Power1800W1500WSonoff S31 WiFi Smart Plug
Energy MonitoringYESNOSonoff S31 WiFi Smart Plug
Connectivity2.4 GHz WiFi2.4 GHz WiFi, BluetoothSonoff WiFi Smart Plug S40 Lite
Weather ResistanceNONOTie
Plug FormatType BType BTie
IntegrationsGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterGoogle Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, MatterTie
On/Off ButtonYESYESTie
Zibgee RouterNONOTie

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 S31 WiFi Smart Plug
  • Sonoff WiFi Smart Plug S40 Lite

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Frequently Asked Questions

Which is better overall: Sonoff S31 WiFi Smart Plug or Sonoff WiFi Smart Plug S40 Lite?

Sonoff S31 WiFi Smart Plug has the stronger overall profile in this comparison, especially for price, maximum load power, and energy monitoring.

What is the biggest difference between Sonoff S31 WiFi Smart Plug and Sonoff WiFi Smart Plug S40 Lite?

Price is one of the clearest differences: Sonoff S31 WiFi Smart Plug lists $10.90, while Sonoff WiFi Smart Plug S40 Lite lists $11.99.

Which one looks better on price?

Sonoff S31 WiFi Smart Plug is listed at $10.90, while Sonoff WiFi Smart Plug S40 Lite is listed at $11.99. Sonoff S31 WiFi Smart Plug (better spec).

Who should buy Sonoff S31 WiFi Smart Plug?

Choose Sonoff S31 WiFi Smart Plug if your priority is price and maximum load power and that matters more than rating.

Who should buy Sonoff WiFi Smart Plug S40 Lite?

Choose Sonoff WiFi Smart Plug S40 Lite if your priority is rating and connectivity and that matters more than price.

Full comparison table

Compare all 36 Plugs side by side

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  • 36 Plugs
  • 31 specs compared
  • 28 filters
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