Product Library / Switches & Dimmers
Research profile · last verified 2026-07-17TP-Link Kasa Smart Wi-Fi Dimmer Switch KS225 (Matter)
Compatibility
| Ecosystem | Support | The catch |
|---|---|---|
| Amazon Alexa | WorksWorks with this ecosystem | Works with Alexa per the official datasheet; Matter is an alternative path. The native path rides the TP-Link cloud account link. |
| Google Home | WorksWorks with this ecosystem | Works with Google Home per the official datasheet; Matter is an alternative path. |
| Apple Home | WorksWorks with this ecosystem | No native HomeKit; Apple Home and Siri work only through Matter, which requires an Apple Home hub (HomePod or Apple TV). TP-Link names the Apple Home app explicitly. |
| SmartThings | WorksWorks with this ecosystem | Works with SmartThings per the official datasheet; Matter is an alternative path. |
| Home Assistant | WorksWorks with this ecosystem | Official tplink integration, local polling, KS225 explicitly listed, with the footnote 'Model requires authentication': TP-Link cloud credentials must be entered once to enable local access. |
Protocols: WIFI · BLUETOOTH · MATTER
Subscription reality
✓ Works without a subscription: Yes.
No subscription tier attached to this device; Kasa app features (schedules, scenes, away mode, remote control) are free per TP-Link's product page and datasheet.
Maintenance reality
- Cloud dependence: No — core function survives without the vendor's cloud
- Neutral wire connection required (datasheet wording). Single-pole only: 'Not compatible with 3-way (multi-location) wiring.' Load: 300 W incandescent, 150 W LED, leading-edge/TRIAC dimming. 2.4 GHz WiFi only; Bluetooth is setup-only. Kasa app remote control runs through a TP-Link cloud account; the datasheet states LAN control via the Kasa app or Matter controllers keeps working when the household is offline. Matter setup code ships in the box and is printed on the switch under the wallplate. Requires a 2-inch-deep wall box.
The catch
Single-pole only with no 3-way option, and the 150 W LED ceiling is low for larger fixtures. Leading-edge TRIAC dimming does not suit every LED bulb; TP-Link itself suggests checking the bulb's supported dimming type.
Who it's for
A fit for single-pole locations in homes that want one dimmer visible to Alexa, Google, SmartThings, Apple Home (via Matter), and Home Assistant without a hub, on a 2.4 GHz network with a neutral wire in the box.
Sources & method
tp-link.com/us/home-networking/smart-switch/ks225/v1/ (page titled 'Kasa Smart Wi-Fi Dimmer Light Switch, Matter') — vendor-page research, verified 2026-07-17 · KS225(US)1.0 Datasheet V1 (static.tp-link.com) — vendor-page research, verified 2026-07-17 · csa-iot.org/csa_product/kasa-smart-wi-fi-dimmer-switch/ — TP-Link Systems Inc., Matter spec 1.0, certified 2023-01-06, cert ID CSA23100MAT40613-24, WiFi+Bluetooth transport. Listing does not print the model string 'KS225'; match is by product name, company, and transport — registry-lookup, verified 2026-07-17 · home-assistant.io/integrations/tplink/ — official, local polling, KS225 in Wall Switches list with footnote 'Model requires authentication' — vendor-page research, verified 2026-07-17. This is a research profile: compiled from manufacturer documentation, certification registries, and published testing — we state facts, not verdicts, and we have not physically tested this unit. How we work →
Compatibility and lifecycle information reflects the last-verified date above and can change without notice (firmware updates, cloud-service changes, discontinuations). It is provided as-is, for information — verify with the manufacturer before purchasing. Spot an error? Tell us and we'll fix it. Full terms: Terms of Service.