If we were to look at the aspect of a clean and smooth user interface in a registry repair tool, then Wise Registry Cleaner is one of the best free registry cleaners for Windows insofar as visual appearance is concerned. 10 Best Free Registry Cleaners for Windows 10, 8 and 7 Users in 2018 Here is our roundup of the best free registry cleaners for Windows, which you can make use of to keep your windows registry healthy and clean. However, the good news is that we have crafted a list of 10 of the best free registry repair tools that will do a perfect job on your Microsoft Windows system be it Windows 10, 8.1, 8 or an older version such as Windows 7.