Tumult Hype now previews directly to Polypane, a browser built with a huge suite of tools for developing and testing responsive web designs. Polypane will appear in the Preview dropdown if you have it installed:
… and Polypane will load each layout at once:
Here’s a quick video showing the tool in action:
Tumult Hype 4.0.6 Update: Layouts in your Hype document are now used for Polypane previews and sending a new preview to Polypane will reload the page in an existing tab if a preview already exists.