Blind 1.0
Blind is “a 1x Web browser for Retina displays” (via John Gruber). The developer says it’s more accurate than Safari’s “low-resolution mode,” which I guess refers to the awkward setting in the Get Info window. There’s also a bookmarklet to send the current page in another browser to Blind. There’s no trial, but it’s only $3 in the Mac App Store. After purchasing, I discovered that it doesn’t support AppleScript and uses Control-Command-U rather than the standard Command-L to focus the URL text field.