Buying guide
Smart Plug Buying Guide (2026)
How to choose a smart plug: ecosystem, Matter, energy monitoring, load rating, and the mistakes first-time buyers should avoid.
Pick the ecosystem first
The first question is which voice assistant the household uses, because a plug that cannot join it is useless. Alexa households can use any plug here, Google households can use any plug except the Amazon Smart Plug, and Apple households need HomeKit, Matter, or Thread support. Matter plugs like the KP125M and P110M are the safest buy for mixed households, since one plug can join several platforms and keeps working if the household switches assistants later.
Matter, Thread, and Wi-Fi: what the words mean
Wi-Fi plugs connect straight to the router and need no hub, which covers most plugs here. Matter is a shared standard that lets one plug join Alexa, Google, Apple Home, and SmartThings, so it is the flexible choice. Thread is a low-power mesh used by Eve Energy, which gives fast local control but needs a Thread border router such as a HomePod mini. None of these is better in every home: Wi-Fi is simplest, Matter is most flexible, and Thread is fastest for Apple homes that already have the hardware.
Energy monitoring: worth paying for
Energy monitoring turns a plug from a switch into a meter. It reports what a connected appliance uses over time, which is how you find out what a space heater or a gaming setup actually costs to run. The KP125M, EP25, P110M, and Eve Energy all include it, while the HS103P2, Amazon Smart Plug, and both Leviton plugs do not. If the plug will run a heater, a dehumidifier, or an air conditioner, buy one with monitoring. If it will only switch a lamp, save the money.
Load rating and what not to plug in
Check the rating before plugging anything in. Most plugs here are rated at 15A, which covers lamps, fans, and coffee makers, while the meross MSS115 is rated at 10A and suits lighter loads only. Never plug in a heater or air conditioner without checking the rating first, and avoid appliances with electronic controls that do not restart when power returns, since the plug can only cut and restore power. A plug that cannot handle its load is a fire risk, so buy a known brand with a proper certification mark.
Size, sockets, and the second outlet
A plug that blocks the socket above or below it costs the household an outlet, which matters once several plugs are in use. Compact plugs like the HS103P2, KP125M, and P110M leave the second socket free, while the Amazon Smart Plug sits low and the outdoor EP40 is a bulky unit that suits one outdoor outlet. Measure the outlet and check the plug dimensions before buying several, and remember that a plug with a manual button is easier to use when the phone is in another room.
Questions, answered
How many smart plugs do I need?
Start with the lamps and fans you switch every day, which is usually two to four plugs for a living room. A two-pack like the HS103P2 or KP125M is a good first purchase, and a four-pack like the EP25 covers a whole room at once. Add more once the first plugs are working, rather than buying a houseful before you know you like them.
Can a smart plug save energy?
It can cut standby power by switching off devices that would otherwise sit idle, such as a television setup or a charger left plugged in. The saving is real but small for most lamps, and the bigger value is energy monitoring, which shows where the electricity actually goes.
Do smart plugs work during a power cut?
No. A smart plug needs power to run, so it switches off with everything else during a cut. When power returns, most plugs restore their last state or switch back on, depending on the setting in the app. Check the power-on behaviour in the app if the plug runs something that must stay off after a cut.