Home Assistant is open-source software for home automation. It connects devices from many brands, runs automations and dashboards, and includes a voice assistant called Assist. You install it on your own hardware, and the project focuses on local control. An optional subscription service, Home Assistant Cloud, provides access from outside the home and links to Google Assistant and Amazon Alexa. According to the project's website, Home Assistant works fully without that service.
The software is licensed under Apache 2.0. The project is governed by the Open Home Foundation, a Swiss non-profit foundation based in Baar, so no company or foreign parent holds control. The cloud service is provided by Nabu Casa, a commercial partner whose legal entity and data location were not confirmed in the sources consulted. Self-hosting keeps automation data on your own infrastructure. The foundation's privacy policy states that its service providers may process personal data outside Switzerland and the EEA, including in the United States.