Metacheck is a tool that provides users with a preview of how links will appear across various social media and chat applications, streamlining the process of link sharing. Users appreciate the time-saving aspect of having all link previews on a single page. However, there are some reported inconsistencies, such as Telegram's Linux version not handling transparency correctly, and users are curious about potential support for Bluesky link cards. Additionally, there are discussions around the open-source nature of Metacheck and users expressing interest in accessing the code via GitHub.