Meshdiff is a free, open-source web tool that allows users to visually compare two STL file versions directly in the browser, entirely client-side. The platform renders both models side by side and highlights geometric differences, making it a valuable resource for engineers, designers, and 3D printing enthusiasts who need to inspect changes between iterations. Because all processing happens locally in the browser, no files are uploaded to a server, ensuring full privacy and zero upload wait times.

The project gained significant traction on Hacker News, earning 74 points and 8 comments from the developer community. Users praised its lightweight architecture and the fact that it requires no installation or backend infrastructure. The tool supports standard STL formats and operates without any data leaving the user's machine.

Meshdiff fills a niche gap for anyone working with 3D models who needs a quick, secure way to detect mesh differences without relying on heavy desktop software. It is especially useful in iterative design workflows where multiple revisions are common.

The tool is accessible at meshdiff.com and runs entirely on client-side JavaScript, making it compatible with modern browsers across all major operating systems.