Tissue Checkin is a Chrome extension developed by Eai that adds a convenient check-in button for Tissue. With just a click of a button, users can open the Tissue check-in link easily.

This extension functions similar to a bookmarklet but offers compatibility even on sites with strict content security policies, such as Twitter. It ensures that users can perform Tissue check-ins effortlessly regardless of the website they are on.

Notably, when using the Tissue Checkin extension on DLsite Play and Fanza's doujin viewers, it automatically shares the URL of the sales page instead of the viewer's URL while viewing a work.

Tissue Checkin is a free extension available for Chrome users, making it a handy tool for those who frequently use Tissue for check-ins.