Johanna Larsson built the super cool Hex Diff tool for the Elixir community. What does it do?
In short, you input any Hex package name and a version range, and it will generate a highlighted git diff for you, right there in your browser. Not only that, but you can also share the link to the diff, and even highlight a specific row.
In this post on her blog, Johanna goes into the details of how she built the project, how it works, and issues she ran into along the way.