CatchUI

Measured conclusion: Deep-tested. L2 outcome: tools_ok.

What is this UI element called? 50 curated UI patterns, names per platform, build prompts. EN/中文.

Add to your agent

Copy this into your MCP client config:

{
  "mcpServers": {
    "CatchUI": {
      "url": "https://catchui.com/api/mcp",
      "transport": "streamable-http"
    }
  }
}

Measured tools (6)

• search_ui_patterns read-only

  Finds the conventional name of a UI element or design pattern from a plain-language description, question or term — e.g. "the bar at the bottom of an app", "three horizontal lines icon", "the black bar at the top of iPhone", "汉堡菜单". Searches CatchUI's curated catalog of 61 patterns and returns names in English and Chinese, definitions, the best-matching Q&A and each entry's catalog URL. Use when someone asks what a UI element is called or what a UI/UX term means.

  Parameters:

  • query (required) — string — Description, question, or name of a UI element, in English or Chinese.
  • limit — integer — Maximum number of matches to return.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_ui_pattern read-only

  Returns the full CatchUI entry for one UI pattern by id (e.g. "tabbar", "bottomsheet"): definition in English and Chinese, pronunciation, aliases, how people describe it, component names per platform, an implementation prompt, real search questions with answers, related patterns and the catalog URL. Takes an id; search_ui_patterns finds ids from descriptions.

  Parameters:

  • id (required) — string — CatchUI pattern id, e.g. "tabbar". list_ui_patterns lists every id.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• list_ui_patterns read-only

  Lists the 61 UI patterns in CatchUI's curated catalog — ids, English and Chinese names and one-line definitions — grouped by family, optionally filtered to one family (NAV, INPUT, ACTION, OVERLAY, FEEDBACK, CONTENT, DATA, SYSTEM).

  Parameters:

  • family — string — Only list patterns in this family.

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• compare_ui_patterns read-only

  Explains how 2 to 4 easily confused UI patterns differ — e.g. toast vs snackbar, modal vs popover vs bottom sheet, tabs vs segmented control, Dynamic Island vs notch. Returns each definition side by side plus the catalog's written comparison when one exists. Accepts ids, names or short descriptions.

  Parameters:

  • patterns (required) — array — 2 to 4 CatchUI pattern ids, names or short descriptions, e.g. ["modal", "popover"] or ["tabs", "segmented control"].

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_ui_component_names read-only

  Returns what a UI pattern is called in code on each platform — SwiftUI, UIKit, Jetpack Compose, Android Views, Flutter, HTML/ARIA and, for system UI, AppKit, Win32 and Electron — or works backwards from a framework component (e.g. "UISegmentedControl", "ModalBottomSheet", "role=tablist") to the pattern and its equivalents elsewhere. Optionally filtered to one platform. Platforms without a native component say so instead of naming one.

  Parameters:

  • query (required) — string — A pattern id, name or description ("segmented control"), or a framework component name ("UISegmentedControl").
  • platform — string — Optional platform filter, matched against the platform label: e.g. "SwiftUI", "UIKit", "Compose", "Android", "Flutter", "Web".

  Hints: read-only yes · destructive no · idempotent yes · open-world no

• get_implementation_prompt read-only

  Returns CatchUI's ready-to-use implementation instructions for 1 to 6 UI patterns — what to build, where it sits, its states and the accessibility it needs — in English or Chinese, for pasting into an AI coding tool such as Claude Code or Cursor. Accepts ids, names or short descriptions.

  Parameters:

  • patterns (required) — array — 1 to 6 CatchUI pattern ids, names or short descriptions, e.g. ["tabs"] or ["search field", "filter chips", "pagination"].
  • language — string — Language of the prompts: "en" (English) or "zh" (简体中文).

  Hints: read-only yes · destructive no · idempotent yes · open-world no

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