The Matter Specifications

The Matter Specification is updated twice a year in Spring and Fall.

  • Version 1.0 was published in November 2022
  • Version 1.1 was published in April 2023
  • Version 1.2 was published in October 2023
  • Version 1.3 was published in May 2024
  • Version 1.4 was published in November 2024
  • Version 1.4.1 was published in May 2025

The specification is made up of a number of documents:

  • The Core Specification defines the components and how they interact along with a number of common procedures.
  • The Application Cluster Specification details the data models used by each cluster that makes up an endpoint.
  • The Device Library Specification sets out the types of End User device in Matter and which Application Clusters make up that device.
  • The Namespace Specification (introduced in 1.2) details common data formats and structures used across multiple clusters.

All these documents can be downloaded from The Alliance website.

For members, in-progress versions of the specification can be found in the Secure document access portal (requires CSA member login).

Members that are working on an approved feature and actively contributing to specification development may submit and review content in the Specification GitHub Repository. If you are a Participant or Promoter member and require access to the Specification GitHub Repository as a contributor, please email help@csa-iot.org.