MarkLayer
Annotate any webpage with drawings, comments, and highlights. Real-time collaboration for Chrome.
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No install snippet on purpose. A working MCP config is a command, its arguments and an environment block — the last two are where API keys live, so this catalogue never stores them and cannot publish them. Follow the link above for the authors' own instructions.
MarkLayer is free forever with no sign-up, account, or payment required. It provides real-time collaboration with live cursors and unlimited collaborators. Users can annotate any live webpage, PDF, or image without installing anything.
Viewers of shared annotations need no extension or account. It offers sixteen annotation tools with single-key shortcuts. Annotations can be exported as Markdown or PNG.
Summary drafted from the project's own website. Every sentence is backed by text on that page and was reviewed before publishing.