balenaEtcher - based on Electron?

Is etcher is based on electron framework?

Yes. Etcher is based on Electron.
It's specified on their homepage.

Open Source
Made with JS, HTML, node.js and Electron. Dive in and contribute!

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Etcher is Open source platform which is based on Electron framework or you can say that it is made on HTML CSS and JavaScript. You can further search out etcher on their website etcherpc.com