Duo for Mac View webpages in desktop and mobile views simultaneously, to quickly test and work through multiple screen experiences.
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Duo for Mac Description

Duo is a dual-paned web browser that lets you browse the web in two views: your standard 'desktop' view as well as a typical 'mobile' view. By seeing these two views at the same time, you're able to quickly test and work through multiple screen experiences rather than considering them separately.

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