Free, open-source web annotation tool. Draw, highlight, and pin threaded comments on any live webpage, then share one link for real-time collaboration (live cursors, voice/video). New since launch: an element inspector for AI-ready handoff, a measure tool, and an MCP server so agents like Claude Code can resolve your annotations as a work queue. No accounts, ever.
Annotate any webpage with drawings, highlights, threaded comments, and arrows — then share one link. Anyone who opens it sees your annotations live, with real-time cursors and synced updates via WebSocket. Voice and video chat included via WebRTC. No account required. Open source. Auto-expires in 30 days.
