Something like this has been discussed for conda
https://github.com/conda/conda/issues/3781
and has been slapped together here
https://gist.github.com/ChrisBarker-NOAA/00106a2af2029259ba7496f865c39086
To reduce the cognitive load of remembering what packages are in which environments, I would like something like
'virtualenv-diff env1 env2'
Does this exist?