Github Jupyter diff viewer is a free Chrome add-on developed by bana.titech. It falls under the category of Browsers, specifically Add-ons & Tools. This program is designed to provide a diff viewer for Jupyter files with the extension *.ipynb on Github.

The main purpose of this add-on is to show only the differences in the source code (Python and Markdown) when viewing file changes in pull requests or commits. It offers a convenient way to review and analyze the changes made to Jupyter files without having to go through the entire code.

To use this add-on with private repositories, users have the option to enter their Github personal access token in the settings. This ensures that the add-on can access and display the diff of the source code in private repositories as well.

Overall, Github Jupyter diff viewer is a useful tool for developers and users working with Jupyter files on Github, allowing them to easily view and compare the changes made to their code.