Helpful & Useful From the Start

I’ve been using this app for literally less than a minute (some will see that as a bad thing), but it’s already so useful and I can already see how it improves efficiency for testing responsive design work.

The only thing I’d like to see is the ability to resize both sides to test portrait vs. landscape and different screen sizes (not presets, but the just the ability to resize.)

Thanks for the excellent tool! It’s already a mainstay in my workflow.

Eric Carroll about Duo