Duo is a web browser that allows you to keep an eye on mobile without losing sight of the desktop. If you're into Responsive Web Development, we made Duo for you.
Mac OSX 10.8 or Better
Duo is an Electric Pulp product.
Duo gives you a typical 'mobile' view using a 320px wide pane, which is adjustable to whatever size suits your needs. A simple dimension indicator is displayed to help you get the perfect size.
In your second pane, browse the web using any width you'd like.
Navigating in either pane updates the other. No need to reload layouts to view pages at different sizes.
Option+Drag to snap to popular widths, or add the Breakpoints dropdown to your toolbar.
Duo has everything you need to make sure your design is doing what it should. Debug code in either pane.
Duo includes tools for clearing your cache and getting rid of those pesky cookies via standard key commands.
Use the convenient bookmarklet in your other browsers to push a site over to Duo.
Duo is designed for Responsive Web Design, not for user-agent sniffing of mobile versions of sites. Duo currently only refreshes both views for GET requests. It's probably not a good fit for your POST refresh heavy project, although we are actively looking at ways to accommodate this.