DoktorKleanor for Mac OS X 10.3 "Panther" is radically different from the previous versions and from other existing system maintenance utilities. The AppleScript Studio + Cocoa interface of DoktorKleanor 10.2 has been replaced by an interactive dialogue between the Doktor Kleanor and the user.

What is original here is that the Doktor offers a list of problems it can fix (e.g "Safari is slow", "Mac Help quits unexpectedly"), rather than a list of repair functions (e.g. "Clear the caches", "Delete preference file x"), thus guiding users to a quick solution to their Mac’s problems. In addition, the code is "100% Unix" (it’s a shell script), which grants a high execution speed. This new application automatically executes the required commands to fix the various common Mac OS X problems reported by the readers of MacFixIt, Mac OS X Hints, XLR8YourMac and other Mac sites.