Duolingo Fast Mode is a Chrome extension developed by klangtools that aims to enhance the learning experience on Duolingo. It offers a way to save time while learning more effectively and with reduced stress. The extension provides immediate feedback on correctness, allowing users to gauge their progress in real-time. Additionally, the feature that allows buttons to auto complete tasks can be a time-saving tool for users looking to optimize their learning sessions.

Moreover, Duolingo Fast Mode includes a function that indicates when it's safe to check answers, providing users with a structured approach to their learning process. This extension supports all non-speaking challenge types, offering a comprehensive learning experience for Duolingo users seeking to improve their language skills efficiently.