# CatchUI (remote · catchui.com)

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

- Trust score: 75/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-17

## Components

- remote · `catchui.com`: 75/100 (this document), [markdown](https://verifymcp.io/servers/com-catchui-ui-patterns/api-mcp.md), [page](https://verifymcp.io/servers/com-catchui-ui-patterns/api-mcp)

## Channel facts

- Endpoint: `https://catchui.com/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-17.

- **Endpoint Security**: 80/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 73/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 952 tokens (~158/item across 6 items; 6 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 60/100
  - Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28.

## Install

### How do I install the CatchUI MCP server?

CatchUI is a hosted endpoint at https://catchui.com/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http com-catchui-ui-patterns 'https://catchui.com/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-catchui-ui-patterns": {
      "url": "https://catchui.com/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-catchui-ui-patterns": {
      "type": "http",
      "url": "https://catchui.com/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-catchui-ui-patterns]
url = "https://catchui.com/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-catchui-ui-patterns": {
      "type": "remote",
      "url": "https://catchui.com/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-catchui-ui-patterns --url 'https://catchui.com/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-catchui-ui-patterns:
    url: "https://catchui.com/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-catchui-ui-patterns": {
      "Transport": "http",
      "Url": "https://catchui.com/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-catchui-ui-patterns -t streamable-http -u 'https://catchui.com/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-catchui-ui-patterns": {
      "type": "http",
      "url": "https://catchui.com/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-17 (score 75, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-15 (score 74, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-12 (score 73, +1)

- [functional improvement] Stability: unverified → 0.07

### 2026-10-10 (score 72)

First indexed and scored.

## MCP tools (6)

### `search_ui_patterns` (~152 tokens)

Search UI patterns by description

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 50 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.

Input parameters:

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

### `get_ui_pattern` (~107 tokens)

Get one UI pattern entry

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.

Input parameters:

- `id` (string, required): CatchUI pattern id, e.g. "tabbar". list_ui_patterns lists every id.

### `list_ui_patterns` (~74 tokens)

List the UI pattern catalog

Lists the 50 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).

Input parameters:

- `family` (string): Only list patterns in this family.

### `compare_ui_patterns` (~113 tokens)

Compare UI patterns

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.

Input parameters:

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

### `get_ui_component_names` (~176 tokens)

Get component names across platforms

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.

Input parameters:

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

### `get_implementation_prompt` (~139 tokens)

Get implementation prompts

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.

Input parameters:

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

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-catchui-ui-patterns/api-mcp#diagnostics

## Score history

- 2026-10-17: 75
- 2026-10-16: 74
- 2026-10-15: 74
- 2026-10-14: 73
- 2026-10-13: 73
- 2026-10-12: 73
- 2026-10-10: 72

## Common questions

### What is the CatchUI MCP server?

CatchUI is an MCP server listed in the public MCP registry as com.catchui/ui-patterns. What is this UI element called? 50 curated UI patterns, names per platform, build prompts. EN/中文. This page covers its hosted endpoint (https://catchui.com/api/mcp).

### Is the CatchUI MCP server safe to use?

CatchUI scores 75 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the CatchUI MCP server expose?

CatchUI exposes 6 tools: search_ui_patterns, get_ui_pattern, list_ui_patterns, compare_ui_patterns, get_ui_component_names, get_implementation_prompt. Their descriptions and schemas cost roughly 761 tokens of context every time the server is loaded.

### Does the CatchUI MCP server require authentication?

No. We connected to CatchUI without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the CatchUI MCP server still maintained?

CatchUI is still listed as active in the MCP registry. We last reached this channel on 17 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://catchui.com/api/mcp
- Website: https://catchui.com/mcp
- Changelog RSS feed: https://verifymcp.io/servers/com-catchui-ui-patterns/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-catchui-ui-patterns/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/com-catchui-ui-patterns/api-mcp