Paper

A design canvas where every element is real HTML and CSS, flexbox included, instead of a proprietary format. Direct consequence: your agent reads and edits your mockups in the language it already knows. The Paper Desktop app (macOS, in open alpha since March 2026) runs a local MCP server with 24 tools, read and write: from Claude Code, the agent creates an artboard (`create_artboard`), writes HTML into it (`write_html`), changes a text or a style, while you watch the canvas fill up.

Strengths

Limitations

Best for

Official site

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