Coherent vs Paper

Coherent is an AI design method for building multi-page products whose pages share components and a growing design system. It generates a Next.js project using Tailwind CSS and shadcn/ui, suitable as a prototype, developer handoff, or frontend. Shared components and editable design tokens propagate changes across pages, with design-system.config.ts as the editable configuration. Users can choose from 10 prebuilt atmospheres or define their own foundation. Coherent supplies context for Cursor, Claude Code, and other AI editors through.cursorrules and CLAUDE.md files. It supports Anthropic Claude or OpenAI GPT using the user’s own API key; typical model costs are estimated at $0.01–$0.03 per page. Its MCP server can validate code, read tokens, extract a design system from a URL, or apply a DESIGN.md file. It can import DESIGN.md and export tokens as W3C DTCG JSON, CSS variables, or Tailwind configuration. Full retrofit into an existing codebase is not supported yet, and direct Figma token import is also not supported. Coherent is open source under the MIT license and available on Linux, macOS, and Windows.

Paper is a connected design canvas for teams working with agents, code, and data. Its HTML/CSS canvas exports designs as code and supports a workflow between the canvas and code. Agents can read and write the canvas to work on responsive layouts, style variations, and consistency checks. Paper MCP also lets agents generate layouts, use real content, and convert selected frames into code, with setup paths for Claude, Codex, Cursor, OpenCode, Antigravity, GitHub Copilot, VS Code, and others. The Snapshot extension copies web components into Paper as editable layers. Figma selections can also be copied as editable layers, though components, variables, masks, and rich text are not fully supported. The Free plan includes unlimited viewers and editors and 100 MCP tool calls per week. Pro is listed at $2,016 a month, billed yearly; paid plans keep viewer seats free. Paper is available on the web and Linux, macOS, and Windows, with an extension. Its DPA describes security controls and restricts specified categories of customer data.