Heading Inspector is a Chrome extension designed to enhance web accessibility by displaying the heading structure (H1–H6) of any web page as perceived by screen readers. This tool is particularly beneficial for accessibility developers and content auditors, as it identifies sequence errors in headings, ensuring proper hierarchical structure. The extension utilizes the Chrome DevTools Protocol to access the accessibility tree, providing a more accurate representation than traditional DOM-based tools, which often overlook common accessibility patterns.

Key features include the ability to toggle the panel easily, visual indicators for correct heading order and errors, and the option to click on headings to navigate to them within the page. The tool operates entirely on-device, ensuring user privacy, with no network calls or data collection involved. It is open-source under the MIT license, promoting transparency and community collaboration in its development.