With Lightlytics' newly released Atlantis integration, you can run a terraform impact analysis simulation as part of an Atlantis workflow, and a Lightlytics comment will appear on every pull request with the full terraform impact analysis.
Atlantis is a Terraform Pull Request Automation tool, that allows CloudOps teams to automatically run a terraform plan against every commit and get the results back as comments. Once the comments are reviewed, the user adds an "Atlantis apply" comment and Atlantis runs "terraform apply". On top of that, Atlantis enables custom workflows in which various policy checks can run against any commit.
By Integrating Lightlytics as an Atlantis workflow, each Terraform commit is simulated and a comment with a link to the impact analysis is sent back.
The result, a full impact simulation against your current running cloud environment and the proposed change.