I think this response is roughly what you’re looking for. The short version is “Magic Mirror is a web application, written in Javascript, that runs on NodeJS, using Electron to display the interface.”
This forum was moved to another machine and updated to a recent version. If you are unable to login please delete your browser cookies and cache and restart your browser.A New Chapter for MagicMirror: The Community Takes the Lead
Read the statement by Michael Teeuw here.
Read the statement by Michael Teeuw here.
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