I understand why you’re going for mobile, but I think the market would be way bigger if you would go for desktop.
Nice concept though.
I’m going to give this a try anyway. Maybe the utility of having reference materials on a third screen, that I can glance at without obfuscating my editor behind a browser window will net some productivity gain. When I need copy/paste and codepen-type solutions, I’ll fire the link over to my MBP.