SPDX License Diff is a free and open-source extension for the Chrome browser. Developed by Alan Tse, this add-on provides a convenient way to compare selected text against the SPDX License List. With just a click of a button, users can easily identify the closest matching license and view the differences against the canonical SPDX license text.

This extension proves to be useful when trying to determine the open-source license of a particular software or document. By comparing the selected text, users can quickly identify if any changes have been made to the license. This can be particularly helpful for developers and organizations who need to ensure compliance with open-source licensing requirements.

The SPDX License List is a comprehensive collection of commonly found licenses and exceptions used in free and open-source software. It includes a standardized short identifier, full name, vetted license text, and a canonical permanent URL for each license and exception. This allows for easy and efficient identification of licenses and exceptions in SPDX documents, source files, and other relevant contexts.

Please note that SPDX License Diff is currently released under the GPL-3.0 license. To stay up to date with the latest improvements and changes, you can refer to the release notes on the project's GitHub repository.