Refcat
REMOTE · MCP.REFCAT.APP
Search 1M real UI flows and 3.3M screens from shipped apps, sites, emails and games.
Available components
Last scanned (5 hours ago)
Scores higher than 76% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Search and Retrieval
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 Security89
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation is enforced on tool calls, but the challenge carries no valid RFC 9728 metadata, so a client cannot discover where to get a token. See how to fix → View diagnostics → Fail
- 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 Usability79
- 100% of prompts and resources have a non-trivial description (not blank, and not just the item's name).Pass
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 1711 tokens (~95/item across 18 items; 18 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management13
- Stability observed for 4 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage77
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 30% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 18 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 19 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
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.
- 5 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 10 to 13. That category is still filling its 30-day observation window: 3 days of observed history at the previous scan, 4 at this one. The score rises as the window fills, whether or not the server changes.
- 3 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.
- 2 Nov 26 0
- Stability: unverified → 0.03 ▲ functional
- 1 Nov 26 76
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 5 Nov 2026 · Probed https://mcp.refcat.app/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=refcat.app | CN=YE1,O=Let's Encrypt,C=US | 1 Oct 2026 | 30 Dec 2026 | ECDSA 256 | ECDSA-SHA384 | 60e1a65c54ffd3c580122cbd12ec12a6fa8 |
| SANs: *.refcat.app, refcat.app | ||||||
| CN=YE1,O=Let's Encrypt,C=US (CA) | CN=Root YE,O=ISRG,C=US | 3 Sept 2025 | 2 Sept 2028 | ECDSA 384 | ECDSA-SHA384 | 5ddd70dd31f801c85c186a7a04b80afe |
| CN=Root YE,O=ISRG,C=US (CA) | CN=ISRG Root X2,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | ECDSA-SHA384 | 872165fc34b6e5fba8add5b3705fb53a |
| CN=ISRG Root X2,O=Internet Security Research Group,C=US (CA) | CN=ISRG Root X1,O=Internet Security Research Group,C=US | 13 May 2026 | 2 Sept 2032 | ECDSA 384 | SHA256-RSA | 6c8f1dc727c7117f7baf853ac980f9cd |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of mcp.refcat.app. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| app. | present | 23684 | 8 | Verified |
| refcat.app. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication Challenged, unverified
The endpoint asked for a token, but we could not retrieve and validate the RFC 9728 metadata that tells a client how to obtain one.
| Result | Challenged, unverified |
|---|---|
| Enforced | On tool calls |
| HTTP status | 200 |
WWW-Authenticate challenge Bearer realm="refcat"
Bearer realm="refcat"| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000 |
| x-content-type-options | nosniff |
Protected resource metadata
| Retrieved | No |
|---|---|
| Problem | no_resource_metadata |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://mcp.refcat.app/mcp | Verified | 200 | |
| http (plaintext) | http://mcp.refcat.app/mcp | HTTPS enforced | 301 | https://mcp.refcat.app/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 →
get_app Get app ~44
Metadata for one app in the catalog. Accepts an appId or a slug like 'spotify'. get_app_flows lists its flows.
| Name | Type | Req | Description |
|---|---|---|---|
| appId | string | yes | – |
No output schema declared.
No examples provided.
get_app_flows Get app flows ~86
The flows of one app (onboarding, checkout, settings…) in order, with capture date. Accepts an appId or slug. Big apps have hundreds of flows: page with offset. Then get_flow for the steps of one.
| Name | Type | Req | Description |
|---|---|---|---|
| appId | string | yes | – |
| limit | integer | – | – |
| offset | integer | – | Skip this many results (pagination) |
No output schema declared.
No examples provided.
get_email_html Get email HTML ~66
The original HTML of one email from search_emails (tables, font fallbacks, dark mode included). Adapt it to the user's brand instead of writing email HTML from scratch. Pro, or this week's free flows.
| Name | Type | Req | Description |
|---|---|---|---|
| emailId | string | yes | emailId from search_emails |
No output schema declared.
No examples provided.
get_flow Get flow ~88
One flow with every step in order. Compact by default: each step has screenDocId (for get_screen), pageType, patterns, components and keyTexts. include 'elements' adds OCR/hotspot boxes per step (large: tens of thousands of tokens for a long flow); 'connections' adds step links.
| Name | Type | Req | Description |
|---|---|---|---|
| flowId | string | yes | – |
| include | array | – | – |
No output schema declared.
No examples provided.
get_flow_history Get flow history ~44
Earlier captures of the same flow (how it changed over time): capture date, screen count and up to 3 preview images each.
| Name | Type | Req | Description |
|---|---|---|---|
| flowId | string | yes | – |
No output schema declared.
No examples provided.
get_project Get project ~26
One project with its screens, positions and connections.
| Name | Type | Req | Description |
|---|---|---|---|
| projectId | string | yes | – |
No output schema declared.
No examples provided.
get_screen Get screen ~156
One catalog screen with its image and structure. Returns an image block (look at it for color, typography and spacing) and JSON with app, flow, platform, pageType, screenPatterns, uiComponents, keyTexts, dimensions, capturedAt and `elements` (OCR text and hotspots with normalized bbox [x0,y0,x1,y1], sorted top to bottom: use them to reproduce hierarchy, order and positions). image 'small' is ~800px wide (~1-2k tokens), 'full' 1800px. Cite the app, flow and capture date when you build from it.
| Name | Type | Req | Description |
|---|---|---|---|
| image | string | – | – |
| includeElements | boolean | – | – |
| screenDocId | string | yes | – |
No output schema declared.
No examples provided.
list_apps List apps ~131
Apps in the catalog, optionally filtered by category key (from list_categories) or platform. Platform `email` lists brands with email galleries.
| Name | Type | Req | Description |
|---|---|---|---|
| category | string | – | – |
| limit | integer | – | – |
| offset | integer | – | Skip this many results (pagination) |
| platform | string | – | ios, android, web (desktop sites), email (brand email galleries), game (game UI: menus, HUD, inventory), reference (curated design references like bento grids), store (app store listing carousels) or… |
No output schema declared.
No examples provided.
list_categories List categories ~106
The catalog's category rail for a platform, with the key list_apps filters by. Emails, games, store listings and ads have their own rails.
| Name | Type | Req | Description |
|---|---|---|---|
| platform | string | – | ios, android, web (desktop sites), email (brand email galleries), game (game UI: menus, HUD, inventory), reference (curated design references like bento grids), store (app store listing carousels) or… |
No output schema declared.
No examples provided.
list_facets List filter values ~82
The filter vocabulary with real counts (number of flows): platform, flowIntents, uiComponents, pageType and screenPatterns. Call this before filtering search_screens or search_flows so filters are real values, not guesses. Optional query/filters narrow every count, flowIntents included.
| Name | Type | Req | Description |
|---|---|---|---|
| filters | object | – | – |
| query | string | – | – |
No output schema declared.
No examples provided.
list_projects List projects ~16
The caller's projects, newest first.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
search_apps Search apps ~113
Find apps in the catalog by name, website or theme ('nubank', 'linear.app', 'meditation').
| Name | Type | Req | Description |
|---|---|---|---|
| limit | integer | – | – |
| platform | array | – | ios, android, web (desktop sites), email (brand email galleries), game (game UI: menus, HUD, inventory), reference (curated design references like bento grids), store (app store listing carousels) or… |
| query | string | yes | – |
No output schema declared.
No examples provided.
search_emails Search emails ~123
Search real product emails (welcome, receipts, onboarding, re-engagement…) by description or brand. Each result is one email with its desktop and/or mobile image; when hasHtml is true, get_email_html returns the original HTML to adapt. Needs Pro.
| Name | Type | Req | Description |
|---|---|---|---|
| appId | array | – | Limit to these brands |
| flowIntents | array | – | – |
| limit | integer | – | – |
| offset | integer | – | Skip this many results (pagination) |
| query | string | – | Free text, e.g. 'welcome email with a big hero image' |
No output schema declared.
No examples provided.
search_flows Search flows ~135
Search whole flows (ordered screen sequences) by intent, app or description. Then get_flow for the steps.
| Name | Type | Req | Description |
|---|---|---|---|
| flowIntents | array | – | – |
| limit | integer | – | – |
| offset | integer | – | Skip this many results (pagination) |
| platform | array | – | ios, android, web (desktop sites), email (brand email galleries), game (game UI: menus, HUD, inventory), reference (curated design references like bento grids), store (app store listing carousels) or… |
| query | string | – | – |
No output schema declared.
No examples provided.
search_screens Search screens ~126
Search individual UI screens by description, app name or site ('paywall with annual plan first', 'Spotify', 'linear.app'). Returns metadata per screen; set includeImages to also get the top screens as images (max 4, ~1-2k tokens each). Call get_screen for the full structure of one.
| Name | Type | Req | Description |
|---|---|---|---|
| filters | object | – | – |
| includeImages | boolean | – | – |
| limit | integer | – | – |
| offset | integer | – | Skip this many results (pagination) |
| query | string | yes | Free text, an app name, or a website |
No output schema declared.
No examples provided.
search_screens_by_image Search screens by image ~72
Find catalog screens that look like your images (base64, e.g. a screenshot of the app you are building). Then call get_screen on the matches to compare. Free plans: up to 2 images and 12 results.
| Name | Type | Req | Description |
|---|---|---|---|
| images | array | yes | – |
| limit | integer | – | – |
No output schema declared.
No examples provided.
similar_apps Find similar apps ~38
Apps like this one, ranked from the app's own flow themes. Accepts an appId or slug.
| Name | Type | Req | Description |
|---|---|---|---|
| appId | string | yes | – |
No output schema declared.
No examples provided.
similar_screens Find similar screens ~62
Screens that look like a given screen. Visual, not keyword — no quota. includeImages returns the top matches as images (max 4).
| Name | Type | Req | Description |
|---|---|---|---|
| includeImages | boolean | – | – |
| limit | integer | – | – |
| screenDocId | string | yes | – |
No output schema declared.
No examples provided.
How do I install the Refcat MCP server?
Refcat is a hosted endpoint at https://mcp.refcat.app/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 · mcp.refcat.app
claude mcp add --transport http app-refcat-refcat 'https://mcp.refcat.app/mcp'
What is the Refcat MCP server?
Refcat is an MCP server listed in the public MCP registry as app.refcat/refcat. Search 1M real UI flows and 3.3M screens from shipped apps, sites, emails and games. This page covers its hosted endpoint (https://mcp.refcat.app/mcp).
Is the Refcat MCP server safe to use?
Refcat scores 78 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 Refcat MCP server expose?
Refcat exposes 18 tools: list_facets, get_screen, search_screens_by_image, search_screens, search_flows, and 13 more. Their descriptions and schemas cost roughly 1,514 tokens of context every time the server is loaded.
Does the Refcat MCP server require authentication?
Yes. Refcat asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.
Is the Refcat MCP server still maintained?
Refcat is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.