Lens is designed to check a website's meta tags, icons, and RSS feeds. Here are its main functionalities:

• Metadata Check: Lens examines a website's metadata, including the character set, title, Open Graph title, description, Open Graph description, and Fediverse creator information. The application also checks for "rel='me'" links.

• Icon and Color Check: Lens identifies the website's icon, title, theme color, and Apple touch icon.

• RSS Feed Check: The application checks for the presence of RSS, Atom, and JSON feeds. It also identifies the feed type and title, as well as the feed URL.

• HTML Display: Lens displays the HTML code found on the page, providing code examples for metadata, RSS feeds, and icons.

Lens also indicates that a domain must be added to the Author Attribution section under Public Profile > Verification in Mastodon settings for the Fediverse creator function to work. This requires Mastodon version 4.3.