A smart lock is worth as much as its integration with the rest of the home. On its own it will open the door — but its real value shows only when it works with the scenes, sensors and app you use every day. In 2026 and 2027 the landscape is defined by four names: Matter, HomeKit/Google/Alexa, KNX/Loxone and Home Assistant. This guide explains how they differ and what to check so the lock does not become an island.

In short:

  • Matter is the layer that connects the lock to the Apple, Google and Amazon ecosystems.
  • HomeKit, Google Home and Alexa differ mainly in the app and the voice assistant.
  • KNX and Loxone are the world of premium installs designed with an integrator.
  • Home Assistant gives local control and maximum privacy.
  • Choose a lock with an open API — your guarantee against being locked into one ecosystem.

What is Matter and why does it change the market?

Matter is a common communication standard for smart-home devices, backed by Apple, Google, Amazon and Samsung. Its goal is to end the "ecosystem wars": a device with the Matter logo should work regardless of whether the home runs on an iPhone, an Android phone or an Amazon speaker. For locks this means standardising the most important functions — lock state, remote locking and notifications.

Why does this matter when buying? Because you buy a lock for years, and the ecosystem in your home may change. Matter support is insurance for the future — even if today you use only one app, tomorrow you can add another brand's device and it all still works. Note, though, that Matter defines a common denominator; advanced features (managing many fingerprints, access logs) are still provided by the maker's own app.

HomeKit, Google Home and Alexa — how they differ for a lock

From the lock's point of view the three big consumer ecosystems do the same thing — let you control the door and weave it into automations — and differ mainly in the app, the voice assistant and small security rules.

Apple HomeKit is known for a strict approach to privacy and an elegant Home app; Siri handles it by voice. Google Home appeals with Android and Google Assistant integration. Amazon Alexa has the widest base of compatible devices and strong voice control. In practice, if the lock supports Matter you can add it to any of them — and the choice comes down to which app and assistant you use every day.

KNX and Loxone — integration in premium installs

In homes designed with an integrator — especially in Germany, Austria and Switzerland — the standard is not a consumer app but a building-automation bus. KNX is an open, international standard for wired automation; Loxone is a popular system with a central miniserver. In both, the lock is not a separate gadget but part of a larger installation: opening the door can disarm the alarm, switch on the hallway light and raise the blinds.

This segment has different requirements from the mass market. Stable wired communication, predictability and the ability for an installer to design the access logic all matter. So a lock for a premium install should expose an interface the integrator can wire to the bus — rather than lock itself into a single mobile app.

Home Assistant — local control and privacy

For technical users and privacy enthusiasts, Home Assistant has become the default "brain" of the home. Its strength is local operation: if the lock exposes a local API, Home Assistant controls it without going through the maker's cloud. That means faster reactions, no dependency on someone else's servers and full control over the data — including entry logs.

It is also a good litmus test of product quality. A lock that can be integrated locally is usually designed openly and for a long life. A lock available only through a closed cloud app — the opposite.

A good lock does not force an ecosystem choice. It clips onto what you already have — today your app, tomorrow the installation an integrator adds.

Zigbee, Z-Wave and Matter — do radio protocols still matter?

Before Matter, smart-home devices communicated mainly over Zigbee, Z-Wave or Wi-Fi, and joining different brands required bridges and workarounds. These protocols are not disappearing — they still run in thousands of installations — but Matter adds a common layer above them, so makers can offer compatibility regardless of the underlying radio protocol. For the user that means fewer compatibility questions and fewer bridges in the cabinet.

So when buying you do not need to memorise every protocol. Just check that the lock declares compatibility with the ecosystem you use, and ideally with Matter as insurance for the future.

What to watch so the lock does not become an island

The biggest disappointment is a lock that opens the door beautifully but talks to nothing. To avoid it, ask three questions: does the device have an open, documented API; does it work locally (without a mandatory cloud); and does the maker declare support for standards, not just its own app. A lock that meets these will integrate today with your phone and, a year from now, with a KNX install or Home Assistant — without replacing the hardware.

How Perrugi approaches integration

In the Perrugi family, the connectivity and security layer is handled by Perrugi Brain — an encrypted lock bus with AES-256, extended with CAN and industrial Ethernet for larger installs. So the same access module fits both a single door at home and larger buildings where wired, predictable communication matters. Perrugi Palm handles the user interface — fingerprint, PIN, NFC and the app — and a coherent system means one mark, one app and one way of mounting for the whole family of devices.

Frequently asked questions (FAQ)

Must a smart lock support Matter?

Not necessarily, but Matter support makes it much easier to connect with Apple, Google and Amazon. It is a sensible choice for the future.

How do KNX/Loxone differ from Matter?

KNX and Loxone are building automation for premium installs designed with an integrator; Matter is a consumer standard. They often complement each other.

Does the lock work locally with Home Assistant?

A good lock exposes a local API, so Home Assistant controls it without the cloud — better for privacy and speed.

Planning an integration at home or in a project? See Perrugi Brain or get in touch for documentation and the API.