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Quick verdict
The KP125M is a standout Matter plug: compact, affordable, and it includes energy monitoring. Pair it via Matter for local on/off control through Home Assistant, Apple Home, or Google Home. The energy data does not travel over Matter, though: for watts you use TP-Link's own integration, which talks to the plug locally but needs your TP-Link account to authenticate. Hard to beat at this price point.
Standout: Matter-certified smart plug with built-in energy monitoring at a budget price.
Notes last checked Mar 25, 2026.
Compatibility snapshot
Home AssistantgoodReliable local integration with minor caveats (a hub, manual config, or polling). Core function works locally.
Apple HomegoodWell supported, with only minor gaps.
Google HomegoodWell supported, with only minor gaps.
AlexagoodWell supported, with only minor gaps.
Works offlineyes
Setupeasy
Extra hub neededno
Powerplug-in smart plug
Local control facts
Home Assistant: matter integration, Local Push (home-assistant.io, checked Oct 10, 2026)
Why it stands out
Matter support with energy monitoring - a rare combo at this price
compact mini form factor doesn't block adjacent outlets
works with Apple Home, Google Home, Alexa, and Home Assistant
Reasons to hesitate
energy monitoring does not come through Matter - paired over Matter it is on/off only, so watts require TP-Link's own integration
Wi-Fi only - no mesh protocol benefits
the Kasa app itself relies on TP-Link cloud
Best for
Matter smart home setups wanting energy monitoring in a compact plug
tracking energy usage of individual appliances via Home Assistant
Avoid if
you need energy monitoring exposed natively in Apple Home (Matter limitation)
you prefer Zigbee or Z-Wave mesh devices
Privacy and local-control notes
Matter support enables fully local control. Energy monitoring data stays local when used via Matter or the TP-Link Home Assistant integration. The Kasa app uses cloud.
Home Assistant support: supported · integration path: matter / tplink.
Buying reality check
Price notes: The KP125MP4 4-pack read $49.99 on Amazon (about $12.50 per plug, verified 2026-10-01), up from $37.99 on 2026-09-06. It is sold as a four-pack, so compare the per-plug figure.
Verified price reads: lowest seen $35.99, latest $49.31 on Oct 29, 2026.
Oct 29, 2026$49.31amazon-4pack
Oct 27, 2026$48.86amazon-4pack
Oct 20, 2026$48.86amazon-4pack
Oct 17, 2026$49.99amazon-4pack
Oct 10, 2026$49.99amazon-4pack
Oct 7, 2026$35.99amazon-4pack-primebigdealdays-deal
TP-Link patched a high-severity Kasa authentication flaw, but the firmware fix can break Home Assistant local control until you flip Third-Party Compatibility.
From the change log and the news briefs that name this product.
Verified against
The compatibility notes above have not been through the source audit yet.
The manufacturer's page is here; the notes were last checked Mar 25, 2026.
TP-Link patched a Kasa authentication flaw, and updating can cost you local control
TP-Link patched a high-severity Kasa authentication flaw, but the firmware fix can break Home Assistant local control until you flip Third-Party Compatibility.
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