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Not a comment on the actual product but did you use a specific template or stack on the app you show in the demo?

Are you referring to the macOS client app? It's built in Swift with an FFI bridge to the Rust-powered connectivity layer. Source is here: https://github.com/firezone/firezone/tree/main/swift/apple

I am referring to the web app

I think it's LiveView for the frontend-backend comms and Tailwind CSS for some of the frontend, not sure if that answers your question

-- (non-web) developer at Firezone