plug

SONOFF S40 Lite

SONOFF

budget HA: goodReliable local integration with minor caveats (a hub, manual config, or polling). Core function works locally. local: goodLocal control for everyday use; a few features may still touch the cloud. wifi

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SONOFF S40 Lite — ESPHome-flashable WiFi smart plug — go fully local with custom firmware

Quick verdict

The SONOFF S40 Lite is a tinkerer's favorite. Out of the box it works with eWeLink (cloud), but flash it with ESPHome and you get a fully local smart plug for pocket change. Note the Lite drops the energy monitoring found on the full S40 — it's basic on/off only. The 15A rating handles most household appliances. If you're comfortable with firmware flashing, this is one of the best value propositions in smart plugs.

Standout: ESPHome-flashable WiFi plug — go fully local with custom firmware.

Last checked: 2026-05-31

Compatibility snapshot

Home Assistant goodReliable local integration with minor caveats (a hub, manual config, or polling). Core function works locally.
Apple Home noneNo official support on this platform.
Google Home okayWorks, but with limits or extra setup.
Alexa okayWorks, but with limits or extra setup.
Works offline yes
Setup moderate
Extra hub needed no
Power plug-in smart plug

Why it stands out

  • 15A capacity handles most household appliances
  • can be flashed with ESPHome for fully local, cloud-free operation
  • very affordable basic on/off WiFi plug

Reasons to hesitate

  • no energy monitoring — the Lite drops the electricity statistics found on the full S40
  • stock firmware is cloud-dependent via eWeLink
  • ESPHome flashing required for best local experience

Best for

  • ESPHome enthusiasts who want a cheap flashable WiFi plug
  • budget on/off control for individual appliances
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Avoid if

  • you want plug-and-play local control without flashing firmware
  • you need Matter or Thread support

Privacy and local-control notes

Stock firmware uses eWeLink cloud by default. Can be flashed with ESPHome for fully local operation. The SONOFF LAN mode also provides some local control without flashing.

Home Assistant support: supported · integration path: sonoff_lan / ESPHome.

Built with ESPHome — see our ESPHome guide for Home Assistant →

Buying reality check

Price notes: Very budget-friendly. One of the cheapest flashable WiFi plugs available.

Compare side by side: see plug comparisons →

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