Comparing Profiles

It is possible to compare two quality profiles to understand the differences in their rule sets: 

The comparison service shows all rule differences (rules in one profile but not in the other, and rules with different severities or with parameters differences):

Comparing Versions of a Profile

Every rule change made to a quality profile will appear in the profile change log:

You can use the changelog comparison service to see the changes that happened between two analyses of a project, for instance. Thanks to the Event widget, this is easy to do because an event is generated on a project each time it is analysed with an updated version of the quality profile set on it: