DMOJ Rating Predictor is a Chrome extension developed by ninjaclasher. This free extension is designed to enhance the experience of users participating in DMOJ contests by providing rating change predictions. With this extension, users can easily see rating changes next to DMOJ contest rankings, allowing them to track their progress and make informed decisions.

The extension utilizes the API at evanzhang.ca to query for rating changes. It also supports custom contest requests using a request token, ensuring that even live hidden-scoreboard contests have accurate rating predictions. The source code for DMOJ Rating Predictor is available on GitHub, allowing users to explore and contribute to its development.

With its user-friendly interface and valuable functionality, DMOJ Rating Predictor is a must-have extension for DMOJ contest participants who want to stay informed about their rating changes.