The repository page of the Green Metrics Tool shows you all known repositories
By clicking on a repository name a drawer will open with all the runs known for that repository.
From there you can go into the details for a specific measurement, or compare them with other runs or even repositories.
Comparing is possible for different repos, different branches and different runs as long as they are on the same machine. Also different machines are supported if you compare the same repo.
Currently we do not support comparing different machines AND different repos at the same time. The tool will notifiy you if you attempt to do so :)