The DDG Visual Regression Tool
ddg-screen-diff tool helps developers easily compare live screenshots of a given page, search results, or Instant Answer from two different hosts.
The tool produces three images: the two screenshots, plus a visual diff of the two screenshots.
For example, you might use this tool to compare live screenshots between your development machine and production, or between beta and production, etc.
Installation and Usage
The full setup and commands are documented in the tool's GitHub repository.