ClassPlus is a free Chrome extension developed by esllo specifically for students using the Cosmos Platform. This open-source extension offers various features to enhance the learning experience on the platform.

With ClassPlus, students can now freely navigate through videos, thanks to the newly added video scrubbing feature. This allows users to easily move forward or backward within a video, providing more control and convenience.

In addition, ClassPlus introduces the ability to open multiple video players simultaneously, making it easier to access and compare different videos. Furthermore, the extension now includes English parsing for the number of incomplete assignments, providing students with a quick overview of their pending tasks.

Other notable features of ClassPlus include a centralized view of attendance status, video playback speed control, quick access buttons for assignments, learning materials, and videos, as well as a count of outstanding assignments and unwatched videos.

ClassPlus has been confirmed to work with several universities, including SMARTLEAD at Hallym University, ULMS at Ulsan University, LEARN at Hoseo University, (formerly) IEILMS at Jeonbuk University, and eClass at Dongyang Future University.