Gummble

Real app screens, flows, and UX copy for your AI agent.

Gummble MCP is a remote Model Context Protocol server that connects Claude, Cursor, Codex, Windsurf, and v0 to a curated library of 300,000+ real app screens, 24,000+ product flows, and the UX microcopy inside them — from 1,500+ shipped iOS and web apps.

Coding agents are good at producing UI, but they guess at what works. Gummble replaces guessing with reference: before building an onboarding, paywall, empty state, or settings screen, your agent searches how top products actually solved it.

This repository hosts documentation and registry metadata for the hosted Gummble MCP server. The server itself is a managed service — there is nothing to install or run from this repo.

Quick start

Server URL: https://mcp.gummble.com/mcp (Streamable HTTP, OAuth)

Claude Code

claude mcp add --transport http --scope user gummble https://mcp.gummble.com/mcp

Claude.ai / Claude Desktop

Settings → Connectors → Add custom connector → paste https://mcp.gummble.com/mcp

Cursor

Add to .cursor/mcp.json:

{
  "mcpServers": {
    "gummble": { "url": "https://mcp.gummble.com/mcp" }
  }
}

Codex / Windsurf / other clients

See the per-client guides at gummble.com/mcp.

On first use you'll be asked to sign in with your Gummble account (OAuth). MCP access is included in every paid plan (from $9/month); new accounts get a 7-day free trial.

Tools

All 12 tools are read-only (readOnlyHint: true). Gummble never modifies your files, projects, or data.

Tool	What it does
gummble_search_screens	Search UI screens in natural language ("paywall with annual discount toggle")
gummble_search_flows	Find complete user flows (onboarding, checkout, upgrade, cancellation)
gummble_get_flow_screens	Walk a flow step by step
gummble_search_microcopy	Search real UX copy — empty states, validation errors, paywall copy
gummble_search_apps	Look up a specific app in the library
gummble_get_app	Drill into one app's screens and flows
gummble_search_patterns	Discover UI patterns across products
gummble_find_similar_screens	Find visually similar screens to iterate on a direction
gummble_get_screen_detail	View a screen's image and metadata
gummble_get_screen_details_batch	Fetch several screens at once
gummble_search_store_screenshots	Search App Store screenshots by keyword (marketing/ASO reference)
gummble_get_store_screenshots	Get an app's App Store screenshot set

Try these prompts

• "Design a paywall for my meditation app. Search Gummble for real paywall patterns first."
• "Show me how Duolingo onboards new users, step by step."
• "Rewrite my empty states using real microcopy from top fitness apps."

Links

• Website & docs: https://gummble.com/mcp
• Prompt guide: https://gummble.com/mcp (see "Read the prompt guide")
• Gummble vs Mobbin MCP: https://gummble.com/compare/mobbin-mcp-alternative
• Research: State of Mobile Onboarding 2026
• Privacy policy: https://gummble.com/privacy
• Support: see SUPPORT.md or open an issue
• Security: report vulnerabilities privately using SECURITY.md
• More design MCP servers: awesome-design-mcp

Registry

Published to the official MCP Registry as com.gummble/mcp — see server.json.