CatchUI
REMOTE · CATCHUI.COM
What is this UI element called? 50 curated UI patterns, names per platform, build prompts. EN/中文.
Available components
Last scanned (10 hours ago)
Scores higher than 68% of remote servers
Reachable. Last reached 17 Oct 2026.
Category Developer Tools
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. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability73
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management23
- Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 6 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 17 Oct 26 +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.
- 15 Oct 26 +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.
- 12 Oct 26 +1
- Stability: unverified → 0.07 ▲ functional
- 10 Oct 26 72
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 17 Oct 2026 · Probed https://catchui.com/api/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=*.catchui.com | CN=YR2,O=Let's Encrypt,C=US | 25 Sept 2026 | 24 Dec 2026 | RSA 2048 | SHA256-RSA | 62673db6a8a333e2f78cdb052563b35322c |
| SANs: *.catchui.com, catchui.com | ||||||
| CN=YR2,O=Let's Encrypt,C=US (CA) | CN=Root YR,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | RSA 2048 | SHA256-RSA | 4ebd24947e24d394802d84a52fd5b319 |
| CN=Root YR,O=ISRG,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | RSA 4096 | SHA256-RSA | f24b6d17f9d9ad7cb1c9fea78782699f |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of catchui.com. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| com. | present | 19718 | 13 | Verified |
| catchui.com. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=63072000 |
| content-security-policy | default-src 'self'; script-src 'self' 'unsafe-eval' https://*.googlesyndication.com https://*.doubleclick.net https://*.google.com https://*.gstatic.com https://adtrafficquality.google https://*.adtrafficquality.google; style-src 'self' 'unsafe-inline'; font-src 'self'; img-src 'self' data: blob: https:; connect-src 'self' https://*.supabase.co wss://*.supabase.co https://*.googlesyndication.com https://*.doubleclick.net https://*.google.com https://*.gstatic.com https://adtrafficquality.google https://*.adtrafficquality.google; frame-src https://*.googlesyndication.com https://*.doubleclick.net https://*.google.com https://*.gstatic.com https://adtrafficquality.google https://*.adtrafficquality.google; frame-ancestors 'none'; base-uri 'self'; form-action 'self'; object-src 'none' |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
| permissions-policy | camera=(), microphone=(), geolocation=() |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://catchui.com/api/mcp | Verified | 200 | |
| http (plaintext) | http://catchui.com/api/mcp | HTTPS enforced | 308 | https://catchui.com/api/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
compare_ui_patterns Compare UI patterns ~113
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.
| Name | Type | Req | Description |
|---|---|---|---|
| patterns | array | yes | 2 to 4 CatchUI pattern ids, names or short descriptions, e.g. ["modal", "popover"] or ["tabs", "segmented control"]. |
No output schema declared.
No examples provided.
get_implementation_prompt Get implementation prompts ~139
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.
| Name | Type | Req | Description |
|---|---|---|---|
| language | string | – | Language of the prompts: "en" (English) or "zh" (简体中文). |
| patterns | array | yes | 1 to 6 CatchUI pattern ids, names or short descriptions, e.g. ["tabs"] or ["search field", "filter chips", "pagination"]. |
No output schema declared.
No examples provided.
get_ui_component_names Get component names across platforms ~176
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.
| Name | Type | Req | Description |
|---|---|---|---|
| platform | string | – | Optional platform filter, matched against the platform label: e.g. "SwiftUI", "UIKit", "Compose", "Android", "Flutter", "Web". |
| query | string | yes | A pattern id, name or description ("segmented control"), or a framework component name ("UISegmentedControl"). |
No output schema declared.
No examples provided.
get_ui_pattern Get one UI pattern entry ~107
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.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | CatchUI pattern id, e.g. "tabbar". list_ui_patterns lists every id. |
No output schema declared.
No examples provided.
list_ui_patterns List the UI pattern catalog ~74
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).
| Name | Type | Req | Description |
|---|---|---|---|
| family | string | – | Only list patterns in this family. |
No output schema declared.
No examples provided.
search_ui_patterns Search UI patterns by description ~152
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.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | Maximum number of matches to return. |
| query | string | yes | Description, question, or name of a UI element, in English or Chinese. |
No output schema declared.
No examples provided.
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.
remote · catchui.com
claude mcp add --transport http com-catchui-ui-patterns 'https://catchui.com/api/mcp'
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.