The Arc browser borrows very little UI or tab/account syncing code from chromium. The non-V8+Blink bits are almost entirely written in swift as far as I know.

The Arc browser borrows very little UI or tab/account syncing code from chromium. The non-V8+Blink bits are almost entirely written in swift as far as I know. This means it probably has the most Windows Swift code of any app out there and that’s why I mentioned it.