Local Smart Home Guide
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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. Wi-Fi
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Quick verdict

The SONOFF S40 Lite is a cheap 15A on/off plug — no energy monitoring (that's the full S40), no Matter, no Thread. Stock eWeLink firmware is cloud-connected by default, but the SonoffLAN integration drives it locally over your network, which is enough for most Home Assistant setups. Know this before you buy: the S40 series runs a Bouffalo Lab BL602 chip rather than an ESP, so despite SONOFF's flashable reputation you cannot put ESPHome or Tasmota on it. If flashing is the point, get the ESP8266-based S31 instead.

Standout: Cheap 15A Wi-Fi plug that answers locally over your LAN on stock firmware.

Last checked: 2026-07-16

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 easy
Extra hub needed no
Power plug-in smart plug

Why it stands out

  • 15A capacity handles most household appliances
  • local LAN control with stock firmware via the SonoffLAN integration — no flashing needed
  • very affordable basic on/off Wi-Fi plug

Reasons to hesitate

  • no energy monitoring — the Lite drops the electricity statistics found on the full S40
  • stock firmware is cloud-dependent by default via eWeLink
  • BL602 chip — not an ESP plug, so ESPHome and Tasmota cannot be flashed onto it

Best for

  • budget on/off control for individual appliances
  • eWeLink owners who want local LAN control without flashing
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Avoid if

  • you want to run ESPHome or Tasmota on your plugs
  • you need energy monitoring, Matter, or Thread support

Privacy and local-control notes

Stock eWeLink firmware talks to the SONOFF cloud by default, but the plug also answers on your LAN: the SonoffLAN custom integration (or the official eWeLink add-on) controls it locally over the network. Unlike the older ESP-based SONOFF plugs, the S40 series uses a Bouffalo Lab BL602 chip, so it cannot be reflashed with ESPHome or Tasmota — the community open-firmware option for BL602 is OpenBeken.

Home Assistant support: supported · integration path: SonoffLAN (eWeLink LAN) / eWeLink add-on.

Buying reality check

Price notes: Very budget-friendly. One of the cheapest 15A Wi-Fi plugs available.

Compare side by side: see plug comparisons →

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Athom Smart Plug V2 (ESPHome) — A smart plug that ships with ESPHome installed, landing in Home Assistant fully local

Athom Smart Plug V2 (ESPHome)

budget

Athom

HA: excellent local: excellent
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