Design Matcher is a free Chrome add-on that simplifies the process of comparing design mockups with live web pages. This tool allows users to overlay design images, such as JPEG and PNG files, onto a webpage for precise visual comparison. Its user-friendly interface focuses on the overlay functionality, making it easy to assess the accuracy of implementations against design specifications.

The add-on offers several features including the ability to move the overlaid images in all directions with adjustable speed settings down to 1 pixel. Users can also scale the images with precision, allowing for adjustments in 0.1 pixel increments. Additionally, the tool saves the overlay position and zoom level, enabling quick retrieval of previous settings when the same image file is used, enhancing workflow efficiency in design verification.