Kasa Smart Wi-Fi Plug KP115 (Energy Monitoring) Review

What the Kasa KP115 actually is

It's a single smart plug. You stick it in an outlet, plug a lamp or fan or space heater into it, and now that thing answers to your phone, a schedule, or your voice through Alexa and Google Assistant. The headline feature over the cheaper KP125 and KP105 is energy monitoring, which means the Kasa app shows you real-time wattage and tracks usage over hours, days, and months.

Physically it's small. The KP115 has a slim profile that won't smother the second outlet on a standard duplex, which is more than you can say for a lot of bulky plugs that hog the whole wall. It connects over 2.4GHz Wi-Fi only, so no hub required, but also no 5GHz. Keep that in mind if your router is fussy.

How it performs day to day

This is where the KP115 earns its reputation. Owners consistently report it just works. Schedules fire on time, the away mode that randomizes lights actually looks plausible, and the plug reconnects after a power blip without you babysitting it. The Kasa app is one of the better ones in this price bracket. It's quick, it doesn't nag you to upgrade, and routines are easy to build.

The energy monitoring is the fun part. Watching a refrigerator's compressor cycle, or finding out your 'off' TV still pulls 15 watts, is the kind of data that quietly changes behavior. It's not laboratory-grade metering, so don't use it to settle a utility dispute, but for spotting energy hogs and estimating monthly cost it's plenty accurate.

Voice control is reliable through Alexa and Google. There's no native Apple HomeKit support, which is the one omission that trips up Apple households. SmartThings and IFTTT pull it in fine if you want broader automation.

The good and the annoying

Pros: cheap, compact, dependable scheduling, useful energy data, no hub, strong app. It's the kind of product you buy one of and then quietly order three more. The 15-amp rating handles most household loads without complaint.

Cons: 2.4GHz only, no HomeKit, and the energy stats live in the app rather than syncing somewhere genuinely powerful. Setup occasionally needs a router nudge if you're running a mesh system that aggressively merges bands. And like most cloud-connected plugs, core remote features lean on TP-Link's servers, so a rare outage on their end can briefly cut app control.

Who should buy it, who should skip it

Buy it if you want to automate lamps, see what your appliances cost to run, or set up vacation lighting without spending real money. It's our default recommendation for anyone dipping into smart home gear, and the energy data makes it the smarter pick over the non-monitoring KP125 for only a couple dollars more.

Skip it if you're an Apple HomeKit purist, since the lack of support is a dealbreaker there. Also skip if you need outdoor rating (this is indoor only) or want to control high-draw equipment beyond a 15-amp circuit. For everyone else, it's hard to argue against.

The verdict

The Kasa KP115 is one of the easiest smart home recommendations going. It does exactly what it promises, the energy monitoring is a real feature rather than a gimmick, and the price keeps it impulse-buy territory. No HomeKit and 2.4GHz-only are the catches. Neither is a surprise at this cost. Reliable, small, cheap, and genuinely useful.

Frequently asked questions

Does the Kasa KP115 work without a hub?

Yes. It connects directly to your 2.4GHz Wi-Fi network through the Kasa app, with no separate hub or bridge needed. Just note it does not support 5GHz Wi-Fi.

Is the energy monitoring on the KP115 accurate?

It's accurate enough for real-world use, like spotting power-hungry devices and estimating monthly running costs. It isn't certified metering, so don't rely on it for anything official, but owners find it consistent and trustworthy for everyday tracking.

Does the KP115 work with Apple HomeKit?

No. It works with Amazon Alexa and Google Assistant, plus SmartThings and IFTTT, but there's no HomeKit support. Apple Home users should look elsewhere.