Man pages are included in the program; it has a Recents menu, where users can view recently opened man pages, a Section selector to jump to a section of the manual, and a Find function that can search for text in the manual.[1] Included with the application is a command line utility called openman that will open invoked man pages in ManOpen.[2] Internally ManOpen does not directly view the man page but runs it though Harald Schlangmann's cat2html or cat2rtf into HTML or RTF for viewing.[3]
In their Mac OS X Version 10.1 Black Book, author Mark R. Bell and system administrator Debrah D. Suggs commented positively on ManOpen usefulness, and described it as "a great utility".[4]