pen.dev vs Prototyper
pen.dev
pen.dev
Prototyper
prototyper.coSide by side
| Figure | pen.dev | Prototyper |
|---|---|---|
| Price from | $16/mo | $20/mo |
| Free plan | Yes | Yes |
| Free trial | — | — |
| Open source | — | — |
| Web | Yes | Yes |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Plans published | 4 | 5 |
| Spec score · AI Wireframe Generators | 9.0 (#7) | 7.8 (#25) |
| Components | Components support reusable symbols, overrides and component slots for composing complex layouts. | Generated components are described as typed, based on Base UI foundations, themed to a design system, and accessible by default. |
| Data handling | Text AI requests using a user's own provider credentials go directly from the device to that provider, while hosted-model requests pass through High Agency infrastructure in real time. | The privacy policy says personal data may be transferred to and processed in the Netherlands and the United States. |
| Integrations | Official documentation lists MCP integrations including Claude Code, Codex, Gemini CLI, Antigravity, OpenCode, Kiro, and Claude Desktop. | The homepage lists GitHub, Drive, Linear, Notion, Figma, MCP servers, and CI among tools that can be accessed from the canvas. |
| Product | pen.dev describes itself as an agentic canvas for building software and a vector design tool integrated with development environments. | Prototyper describes itself as a visual workspace where designers, engineers, and agents work on the same surface to turn ideas into running code. |
Plans
Prototyper
- FreeFree
- Premium$20 a month
- Team$30 a month
- Team Business$100 a month
- EnterprisePriced on request
In their own words
pen.dev
pen.dev is a canvas for building software and a vector design tool integrated with development environments. Its editor works with components, variables, themes, scripts and shaders, and can import Figma files and HTML. It can export to HTML, CSS and Tailwind, as well as PNG, JPEG, WEBP and PDF. Users can work with its integrated agent or connect external agents through MCP; the available plans specify how many agents can run in parallel. Documented integrations include Claude Code, Codex, Gemini CLI, Antigravity, OpenCode, Kiro and Claude Desktop. Integrated provider options include OpenAI, Anthropic, Google Gemini, Cursor, GitHub Copilot, xAI, OpenRouter and other API-key providers. Its.pen design file is open JSON with an open schema. Tools include a Chrome extension for importing webpages, IDE extensions and an npm-installed CLI requiring Node.js 22.19 or later. The pricing page says pen.dev stays free until plans launch. The Free plan is free; Pro is $16 a month; Ultra is $48 a month.
Prototyper
Prototyper has no write-up on Specifiction yet; its figures are above.