Does the Kasa dimmer need a neutral wire?

Yes. It requires a neutral wire in the switch box. If your box only has a switched live, choose a no-neutral dimmer instead.

No. It connects directly to your 2.4GHz Wi-Fi through the Kasa Smart app.

Does it work with Apple HomeKit?

Most Kasa dimmer models support Alexa and Google Assistant but not HomeKit. Check the specific model if HomeKit matters to you.

Is there a subscription?

No. All features, including schedules and scenes, are free in the Kasa app.

Kasa Smart Dimmer Switch Review (2026): The Easy Wi-Fi Dimmer

A no-hub, no-subscription wall dimmer that just works on your existing Wi-Fi — with one wiring requirement to check first.

The Kasa Smart Dimmer (model KS220 / HS220 family) is TP-Link’s answer to “I just want a smart dimmer that works without buying into an ecosystem.” It replaces your existing wall switch, connects straight to your 2.4GHz Wi-Fi, and needs no hub. For most people who want dimmable smart lighting in one room, this is the path of least resistance — provided your wiring cooperates.

How we assess: We haven’t lab-tested this individual unit. This is a spec-and-wiring analysis grounded in TP-Link’s published specifications and how in-wall dimmers work. We judge every product on install requirements, hub dependency and ecosystem support before features — and we flag clearly when a verdict rests on the specification rather than hands-on hours.

Verdict: The easiest mainstream smart dimmer for a single-pole, neutral-wired switch. Buy it if your box has a neutral wire and you want simple, hub-free dimming. Check your wiring first — this one needs a neutral, and that is the single thing that decides whether it works for you.

The one requirement that decides it

Before anything else: the Kasa dimmer requires a neutral wire in the switch box. Most homes built or rewired in recent decades have one; many older homes do not. If your box has only a single switched-live wire, this dimmer will not work, and you want a no-neutral dimmer instead (see our guide below). Open the switch plate and look for a bundle of white wires capped together — that is your neutral. This check takes two minutes and saves a return.

Connectivity	Wi-Fi 2.4GHz, direct (no hub)
Wiring	Neutral wire required; single-pole (3-way in some models)
App	Kasa Smart app; also TP-Link Tapo line
Voice	Alexa, Google Assistant
Subscription	None — all features free
Scheduling	Schedules, scenes, away mode, gradual on/off

What’s good

No hub, no subscription — works on plain Wi-Fi
Reliable app with schedules and scenes
Smooth dimming with adjustable range
Affordable for a true in-wall smart dimmer
Alexa and Google built in

What’s not

Requires a neutral wire — not for every box
2.4GHz Wi-Fi only
No Apple HomeKit on most models
Wi-Fi dimmers add load to your router at scale

Who it is for

This is for the person who wants one or a few rooms dimmable, controlled by phone or voice, without a hub or monthly fee — and who has neutral wiring. If you are on HomeKit, or your boxes lack a neutral, look elsewhere. But for mainstream Alexa/Google homes with standard wiring, the Kasa dimmer is one of the simplest, most reliable choices on the market.

Check price on Amazon

How it compares

If your box has no neutral wire, the Kasa is the wrong pick — see our guide to the best smart dimmer switches without a neutral wire. If you want the most reliable premium option with its own ultra-stable hub, our Lutron Caséta review covers the gold standard. The Kasa sits in the sweet spot: cheaper and hub-free, as long as you have a neutral.

FAQ

Does the Kasa dimmer need a neutral wire?: Yes. It requires a neutral wire in the switch box. If your box only has a switched live, choose a no-neutral dimmer instead.
Does it need a hub?: No. It connects directly to your 2.4GHz Wi-Fi through the Kasa Smart app.
Does it work with Apple HomeKit?: Most Kasa dimmer models support Alexa and Google Assistant but not HomeKit. Check the specific model if HomeKit matters to you.
Is there a subscription?: No. All features, including schedules and scenes, are free in the Kasa app.

As an Amazon Associate we earn from qualifying purchases. Our analysis is independent and method-transparent: where a verdict rests on the specification rather than hands-on testing, we say so.