Marmo UI
6.5#16 in ai ui design generatorsFrom $9.99 a monthFree planWeb
VisitMarmo UI vs pen.dev
What both publish
| Fact | Marmo UI | pen.dev |
|---|---|---|
| Data handling | The pricing FAQ says generated code does not phone home. | 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. |
| Integrations | The install guide documents connections for Claude Code, Codex, Cursor, Gemini CLI, Windsurf, and other MCP clients. | Official documentation lists MCP integrations including Claude Code, Codex, Gemini CLI, Antigravity, OpenCode, Kiro, and Claude Desktop. |
| Product | Marmo is an open-source React design system paired with a hosted MCP server that gives AI agents live component APIs, composition patterns, and generation rules. | pen.dev describes itself as an agentic canvas for building software and a vector design tool integrated with development environments. |
Marmo UI plans
- FreeFree
- Pro$9.99 a month
pen.dev plans
- FreeFree
- Pro$16 a month
- Ultra$48 a month
- EnterprisePriced on request
Pick Marmo UI if…
Marmo UI suits developers using AI agents to generate React interfaces from a design system. The free tier may suit users who want its core components and design resources without a paid plan.
Pick pen.dev if…
pen.dev suits designers and developers who want to combine vector design, code-oriented exports, and agent workflows. It may also suit teams connecting external agents or providers through MCP and the listed integrations.