Motion DevTools, developed by Motion One, is a browser extension available on Chrome. This free tool falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. Motion DevTools allows users to inspect, edit, and export animations created with CSS and Motion One.

With Motion DevTools, users can easily inspect animations by pressing record and interacting with the page. The extension detects CSS and Motion One animations and plots them on a classic timeline interface. Users can then use the playback controls to scrub through and replay the animation from any point.

In addition to inspection, Motion DevTools also provides editing capabilities. Users can add, move, and remove keyframes, as well as edit values and easing using custom controls. All edits made are reflected in real-time on the page.

Once the animation is perfected, users can hit the export button to instantly generate code. Motion DevTools allows users to export animations into CSS transitions, CSS animations, or Motion One.

Overall, Motion DevTools is a powerful extension for developers and designers working with CSS animations. Its intuitive interface and real-time editing capabilities make it a valuable tool for creating and fine-tuning animations.