TP-Link Kasa HS103P4 Smart Plug Review (2026): The 4-Pack

Why you should trust this review

I bought this Kasa HS103P4 4-pack at retail. TP-Link did not provide a sample. I run a smart home with 32 connected devices, and over the past four years I have installed Kasa plugs in roughly a dozen friends’ and clients’ homes, so I have seen how these hold up well beyond my own walls.

For this review I put all four plugs into daily service in my own house and ran them against an Amazon Smart Plug and a Eufy SmartPlug Mini 2-pack on the same Wi-Fi network and Alexa account. Comparing them head to head on identical infrastructure is the only way to know whether response-time and reliability differences are real or just network noise.

How we evaluated

I kept all four plugs in active use for ten months: two on lamps, one on a tower fan, and one on an electric kettle. I logged 200 voice commands across Alexa, Google, and Apple Home, stopwatch-timing response against the Amazon and Eufy plugs to compare apples to apples. I watched the Away Mode randomization pattern over a 30-day stretch while the house was empty.

I also tested Matter pairing and HomePod 2 hub stability over eight months, and I measured how hot the kettle plug got under a full resistive load with a contact thermometer. The full protocol is on our methodology page.

Response time and reliability: among the fastest

Across my 200 logged voice commands, the average wake-to-relay-click was about 0.7 seconds. That is faster than the Amazon Smart Plug at roughly 1.0 second and matches the Eufy. In daily use 0.7 seconds is the difference between a plug that feels instant and one where you say the command and then wait a beat wondering if it heard you. The Kasa feels instant.

More important than speed is that nothing failed. Over ten months across four active plugs, including one driving a kettle daily, I had no dropouts, no plugs falling off the network, and no need to reset anything. For a device you forget about and rely on, that boring consistency is exactly what you want. I also leaned on the schedules feature heavily: the lamp plugs run on a sunrise and sunset schedule that tracks the actual changing daylight rather than a fixed clock time, and across ten months the schedule never drifted or skipped a day. That sounds trivial until you have used cheaper plugs that quietly stop firing their schedule after a router reboot. The plugs use a vendor cloud account, which is mandatory and worth noting if you object to that on principle, but it has not caused me any reliability issues.

Compatibility: covers every major platform

The Kasa app, Alexa, Google Assistant, and SmartThings have all worked since launch, and the 2024 firmware added Matter, which brought Apple Home and broader interoperability. I had all four plugs paired across Alexa and Apple Home simultaneously for eight months with no conflicts, which is the kind of mixed-ecosystem setup that often trips cheaper plugs up.

The practical upshot is that this is the plug I recommend when someone is not sure which voice ecosystem they will land on, or when a household has more than one. It works with all of them, and the Matter addition means it should keep working as the standard matures. The one limitation to plan around is that these are 2.4 GHz Wi-Fi only, so on a congested or 5 GHz-only network you will want to make sure a 2.4 GHz band is available. In my house, where the 2.4 GHz band already carries a couple dozen devices, all four plugs sat on it without any of them dropping, which suggests the radio is well-behaved even on a busy band. If your router hides 2.4 GHz behind a single combined network name, the plugs still find it during setup, though it is worth temporarily separating the bands if pairing ever stalls.

Build, Away Mode, and heat: the practical details

The plugs are physically small, which matters more than it sounds. On a six-outlet strip I fit four HS103 plugs without blocking any adjacent slots; the bulkier Amazon Smart Plug blocks a neighbor doing the same job. The one minor annoyance is that the reset pinhole is small, so keep a paperclip handy during setup.

Away Mode is the feature I did not expect to value. It randomizes on/off times within a window you set, and over 30 days of watching it while away, the pattern varied within roughly half an hour around the configured times and avoided regular intervals. It is the most realistic randomization I have used, which makes it genuinely useful for looking lived-in while traveling. On heat, running my 1500W kettle through one plug across 60 cumulative cycles, the body warmed to about 41 C against a contact thermometer, well within its ETL spec, with no flicker on the relay click afterward. That kettle test matters because high-draw appliances are where cheap plugs fail, either by buzzing under load or by the relay welding shut over time. After 60 kettle cycles the relay still clicks cleanly, the plug runs at the same temperature it did on day one, and there is no discoloration around the prongs, which is the reassurance you want before you trust a plug with anything that pulls real current.

Who should buy the Kasa HS103P4?

Buy it if you want to add four smart plugs to a home at a low per-plug cost, you use Alexa, Google, or Apple Home and want plugs that work with all three, and you want a small footprint that does not block neighboring outlets.

Skip it if you need energy monitoring on every plug, since this model has none, you are on a 5 GHz-only network, or you object to a mandatory vendor cloud account with no offline-only mode.

The verdict

The Kasa HS103P4 has been the default smart plug recommendation for years, and after ten months of running four of them around the clock, I understand why. They are fast, small, compatible with everything, and they simply do not fail. The lack of energy monitoring is the one real gap, and if that matters to you the Kasa KP125M is the same form factor with monitoring. For everyone else who just wants reliable smart control of lamps and appliances at the lowest sensible price, this 4-pack is still the easy pick. If you want monitoring at a similar cost, the Eufy 2-pack is the alternative worth weighing.