Pupil (US$5.00) is an app specifically designed for Macs with Retina displays, specifically Apple's retina-equipped MacBook Pro range (rMBP). Although Mac OS X gives users 5 screen resolution options, they are cumbersome to access and change, with users having to enter System Preferences any time they want to change the screen's resolution.
Most users of a rMBP will be happy with the native retina-display resolution of 2880 x 1800, but more demanding (or adventurous) users may wish to regularly change their Mac's screen resolution to take advantage of the greater screen real estate rMBPs have to offer.
Pupil is a simple utility app that gives you access to varying screen resolutions (including 1:1 native pixel resolution for retina displays) directly from the Mac OS X menu
