A method and technique for OCR-based single sign-on in a computing environment includes automatically causing a display of a dialog screen of an application in response to launching a login interface of the application. An image of the dialog screen is automatically captured, and version information about the application is derived from the image of the dialog screen. An image of the login interface is automatically captured, and the launched login interface is automatically verified as corresponding to a version of the application based on the version information derived from the image of the dialog screen.