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. 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 connectivity and integrations are more important to you than the overall verdict. That makes Sonoff S31 WiFi Smart Plug the clearer recommendation in 2026.
vs
FeatureSonoff S31 WiFi Smart PlugSonoff WiFi Smart Plug S40 LiteWinner
Price$10.90$11.99Sonoff S31 WiFi Smart Plug
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
IntegrationsGoogle Home, Alexa, Home Assistant, IFTTTGoogle Home, Alexa, Samsung SmartThings, Home Assistant, IFTTTSonoff WiFi Smart Plug S40 Lite
Rating4.24.2Tie
Weather ResistanceNONOTie
Plug FormatType BType BTie
Overheat/Overload ProtectionNONOTie
On/Off ButtonYESYESTie
Zibgee RouterNONOTie

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 connectivity.

Who should buy Sonoff WiFi Smart Plug S40 Lite?

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

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Independent · Not sponsoredBrands never pay for placement or rankings. Affiliate commissions never influence our comparisons.
© 2026 Smart Home Compared
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