The Matter SDK is fully open source (Apache 2.0) on GitHub (project-chip/connectedhomeip) with more than one hundred active contributors, which lets OEMs ship Matter devices quickly and lets hobbyists and Home Assistant integrate Matter directly.
True
The Connected Home over IP repository is published under the Apache 2.0 licence, which authorises unrestricted commercial use. It targets a wide range of platforms (Linux, ESP32, Nordic Semiconductor, NXP, Silicon Labs, Infineon) and ships a CLI client called chip-tool plus sample applications for both devices and clients. Every major ecosystem (Apple, Google, Amazon, Samsung) contributes back to this codebase, which is unusual in the smart-home space and is one of the main reasons interoperability has actually held up across vendors.
When you debug a real interop issue, reproduce it with chip-tool against the reference SDK before blaming a vendor: many bugs end up being SDK-side and can be confirmed in minutes with the open-source tool.
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