The software iSysCleaner Pro is a new contender and although it is called Pro it is completely free to download and use. It comes with the usual ability to clean temporary data from various applications and the operating system with a concentration on Windows, other Microsoft applications like Microsoft Outlook or Microsoft Office and Internet applications like Firefox and Flock.

A comparison of the default scans had the result that iSysCleaner Pro found roughly 120 Megabytes of additional data that could be removed than CCleaner did. The main difference seems to be that iSysCleaner Pro is cleaning installation files while CCleaner does not. The installers for Quicktime and iTunes for instance that are stored in the iTunes directory would be cleaned by iSysCleaner Pro which attributes to about 55 Megabytes of data.

Both applications provide the option to clean the prefetch folder shows that myths are hard to come by. Cleaning that folder degrades system performance for a while until Windows creates the prefetch files anew. The software is constantly being updated and an alternative to CCleaner.