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A11yScope

by perceivableversion 0.3.0i★ 1 (Stars for the whole repo)iRuns on your computer
Registry nameio.github.perceivable/a11yscope

How to install

What it does

WCAG 2.2 AA accessibility checks for pages and HTML, run locally in headless Chrome.

  • Connects Runs on your computer
  • Account or key No key needed
  • Category Web & browsers

Install

Pick the AI app you use, then copy the settings.

Passed 2/3 checks · Runs on your computer · ✓ Commands checked Nov 13, 2026

First: which AI do you use?

Pick your app and the steps appear below.

Works with Claude, with some setup first

Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone

Let AI install it

Copy this message into a Claude chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server A11yScope for Claude on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "a11yscope": { "command": "npx", "args": [ "-y", "a11yscope-mcp" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the A11yScope tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

  1. Install Node.js (if you don’t have it)

    Already installed? Check first · Open Terminal, type this command and press Enter

    node -v
    • A version number such as v26.13.1 = installed, skip this step
    • "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
    How to open Terminal

    Mac: press ⌘ + Space, type Terminal, press Enter

    Windows: open Start, type Windows PowerShell, then Open

    Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed

    Open the Node.js download page ↗

    When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v

    Install once; it works for everything that needs Node.js

  2. Open the Claude desktop app’s settings file

    SettingsDeveloperEdit Config

  3. Paste these settings and save the file

    {
  "mcpServers": {
    "a11yscope": {
      "command": "npx",
      "args": [
        "-y",
        "a11yscope-mcp"
      ]
    }
  }
}

  4. Quit Claude and open it again

  5. Try it

    Use A11yScope and tell me what you can do for me, then show me one thing

    ✓ If Claude says it is using A11yScope or shows a A11yScope tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

ChatGPT cannot connect A11yScope yet

A11yScope runs on your computer, but ChatGPT can only connect servers that run on the web

What you can do instead

A · Use an app that can connect A11yScope

  • Install Node.js on your computer first (one time) · Only the Claude desktop app (Windows or Mac), not the web or phone
  • Install Node.js on your computer first (one time)
  • Install Node.js on your computer first (one time)
  • Install Node.js on your computer first (one time)

B · Others in Web & browsers that work with ChatGPT

Picked from the most used in the same category, only ones that connect by address with no key

Works with Claude Code, with some setup first

Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a Claude Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server A11yScope for Claude Code on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): claude mcp add --scope user a11yscope -- npx -y a11yscope-mcp 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the A11yScope tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

  1. Install Node.js (if you don’t have it)

    Already installed? Check first · Open Terminal, type this command and press Enter

    node -v
    • A version number such as v26.13.1 = installed, skip this step
    • "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
    How to open Terminal

    Mac: press ⌘ + Space, type Terminal, press Enter

    Windows: open Start, type Windows PowerShell, then Open

    Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed

    Open the Node.js download page ↗

    When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v

    Install once; it works for everything that needs Node.js

  2. Open Terminal

    Mac: press Command+Space and type Terminal · Windows: open PowerShell

  3. Paste this command and press Enter

    claude mcp add --scope user a11yscope -- npx -y a11yscope-mcp

  4. Type /mcp in Claude Code

    You should see A11yScope listed as connected

  5. Try it

    Use A11yScope and tell me what you can do for me, then show me one thing

    ✓ If Claude Code says it is using A11yScope or shows a A11yScope tool in the answer, you are connected

Menu names checked against Anthropic’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with Cursor, with some setup first

Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a Cursor chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server A11yScope for Cursor on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "mcpServers": { "a11yscope": { "command": "npx", "args": [ "-y", "a11yscope-mcp" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the A11yScope tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

  1. Install Node.js (if you don’t have it)

    Already installed? Check first · Open Terminal, type this command and press Enter

    node -v
    • A version number such as v26.13.1 = installed, skip this step
    • "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
    How to open Terminal

    Mac: press ⌘ + Space, type Terminal, press Enter

    Windows: open Start, type Windows PowerShell, then Open

    Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed

    Open the Node.js download page ↗

    When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v

    Install once; it works for everything that needs Node.js

  2. Click this button to open Cursor

    Open in Cursor

    Cursor asks you to confirm; click Install

  3. Open the AI chat in Cursor in Agent mode

  4. Try it

    Use A11yScope and tell me what you can do for me, then show me one thing

    ✓ If Cursor says it is using A11yScope or shows a A11yScope tool in the answer, you are connected

Menu names checked against Cursor’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Works with VS Code, with some setup first

Install Node.js on your computer first (one time)

Let AI install it

Copy this message into a VS Code chat. The AI checks your computer, tells you which file it will change, and waits for your OK every time.

Please install the MCP server A11yScope for VS Code on this computer, in this order: 1) Check Node.js with node -v. If it is missing, tell me to install it from https://nodejs.org/en/download; do not install it yourself. 2) Use only this config (already checked by PopNx MCP): { "servers": { "a11yscope": { "type": "stdio", "command": "npx", "args": [ "-y", "a11yscope-mcp" ] } } } 3) Tell me the full path of the file you will change, or the command you will run, and wait for my OK. 4) No key is needed. 5) Do what we agreed, then check that the A11yScope tools really show up.

This message has no key in it. If a key is needed, the AI will ask you to paste it yourself into the file or the app’s field.

  1. Install Node.js (if you don’t have it)

    Already installed? Check first · Open Terminal, type this command and press Enter

    node -v
    • A version number such as v26.13.1 = installed, skip this step
    • "command not found" (on Windows: "is not recognized") = not installed yet, or installed but Terminal needs to be closed and reopened
    How to open Terminal

    Mac: press ⌘ + Space, type Terminal, press Enter

    Windows: open Start, type Windows PowerShell, then Open

    Not installed: Open the official download page, pick the LTS version and the click-through installer: .pkg on Mac · .msi on Windows. Double-click and follow it to the end. No curl command needed

    Open the Node.js download page ↗

    When it’s done, close Terminal, open it again and run the same command. You should see a version number: node -v

    Install once; it works for everything that needs Node.js

  2. Click this button to open VS Code

    Open in VS Code

    VS Code asks you to confirm; click Install

  3. Open the AI chat in VS Code in Agent mode

  4. Try it

    Use A11yScope and tell me what you can do for me, then show me one thing

    ✓ If VS Code says it is using A11yScope or shows a A11yScope tool in the answer, you are connected

Menu names checked against VS Code’s help page on Nov 11, 2026 · your screen may differ slightly by app version

Other apps that use MCP, such as Windsurf, Zed or Gemini CLI, each add servers differently. See how in the app list.

See every app that uses MCP →

JSON settings are under “For developers” below

Stuck? Ask people who use A11yScope💬 Discussion →
For developers: Terminal commands and JSON settings

Installed on your computer

Claude Code

claude mcp add --scope user a11yscope -- npx -y a11yscope-mcp

Claude Desktop (claude_desktop_config.json)

{
  "mcpServers": {
    "a11yscope": {
      "command": "npx",
      "args": [
        "-y",
        "a11yscope-mcp"
      ]
    }
  }
}

Cursor (~/.cursor/mcp.json)

{
  "mcpServers": {
    "a11yscope": {
      "command": "npx",
      "args": [
        "-y",
        "a11yscope-mcp"
      ]
    }
  }
}

VS Code (mcp.json)

{
  "servers": {
    "a11yscope": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "a11yscope-mcp"
      ]
    }
  }
}

These settings are generated from the maker’s registry entry. If the README says otherwise, follow the README.

At a glance

GitHub starsi
1 (Stars for the whole repo)
This repo holds several MCP listings; its stars count once in rankings
Downloads per weeki
75/wk
Licencei
No licence stated
Connection
Runs on your computer
Latest versioni
0.3.0
Published to registryi
Oct 14, 2026
Code last changedi
Oct 24, 2026
Maker
perceivable
Packages
npm: a11yscope-mcp
Registry status
Active

Which apps can use it

Based on how this server connects and on each app’s own docs, checked Nov 10, 2026.

Run on your computer in

ClaudeGooseLM StudioMsty StudioCherry StudioCursorVS Code + GitHub CopilotVisual StudioWindsurf (Devin Desktop)ZedKiroClineContinueJetBrains AI AssistantClaude CodeCodex CLIGemini CLIOpenCodenodecodeWarpLibreChatRaycast

All apps, with pros and cons →

Related guides

Guide 85 checks before you install an MCPAbout 2 minutes each: check its page on our site and the permission request in your AI app before you say yes.4 min read

What it can do

Runs on your computer; the tool list appears in your AI app after you install it.

Basic checksi

We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 15, 2026

  • ✓ Pass

    Maker matches the repo

    The registry name was verified with the GitHub account perceivable, which owns the repo

  • ✓ Pass

    Still maintained

    Code last changed 22 days ago

  • ! Caution

    Has a licence

    GitHub could not identify the licence type; open the file to check

  • – Not applicable

    Endpoint responds

    This one runs on your computer; there is no internet endpoint

  • – Not applicable

    Sign-in with OAuth

    Runs on your computer and uses local settings instead

  • … Not checked yet

    No hidden instructions in tool descriptions

    Runs on your computer; we can only read tool lists from internet endpoints

Published vulnerabilities (OSV.dev)

Not checked yet

What we check → · JSON

Makers: ask for a re-check or report wrong info

Sign in

Discussion

Ask, share a tip or report that it does not work. Sorted by what people marked helpful.

No posts yet. Be the first to ask or share.

Posts here are written by users, not the PopNx team.

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User reviews

No reviews yet

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Compared with others in Web & browsersi

  • More stars than 0% of the other 1525 servers in this category
  • Published to the registry more recently than 49% of the other 1525 servers in this category
  • Basic checks equal to or better than 53% of the other 1525 servers in this category

Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.

Common questions

Is A11yScope safe?

It passed 2 of 3 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.

What keys or codes does it need?

The registry does not list a required key, though some servers ask you to sign in on first use.

Does it run on my computer or in the cloud?

It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).

Is it still maintained?

The GitHub repo last changed 22 days ago, and the latest version (0.3.0) reached the registry 32 days ago.

Which apps can use it?

Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code. You also need Node.js on your computer.

What can I use instead?

In the same category: Browser Use, changedetection.io (official), Apify MCP Server, Actionbook, Flowershow

Similar alternatives

Same category, other makers, commands already checked. Official ones first, then by stars.

Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi

Browser Use

Lets AI do web tasks for you, such as filling forms, searching and extracting data, in the maker’s cloud browsers or on your computer.

by browser-useWidely used↓ 1.7M/wk★ 121KUpdated 25 days ago

Computer or cloud✓ service owner · browser-use.com
Install

changedetection.io (official)

Official changedetection.io MCP: web page change tracking, back-in-stock and price alerts.

by dgtlmoonWidely used★ 35.8KUpdated 10 days ago

Runs in the cloud✓ service owner · changedetection.io
How to connect

Apify MCP Server

Extract data from any website with thousands of scrapers, crawlers, and automations on Apify Store ⚡

by apifyWidely used★ 16.3KUpdated 2 days ago

Runs in the cloud✓ service owner · apify.com
How to connect

Actionbook

Let your AI agent operate any website through a real, logged-in browser session.

by actionbookGrowing★ 1.6KUpdated 27 days ago

Runs in the cloud✓ service owner · actionbook.app
How to connect

Flowershow

Publish Markdown and HTML from your AI session as a live website. No account needed.

by flowershowGrowing★ 1.1KUpdated 20 days ago

Runs in the cloud✓ service owner · flowershow.app
How to connect
  • Browser Use — Cloud or install on your computer · Needs a key · In Claude’s directory
  • changedetection.io (official) — Runs in the cloud, nothing to install · No key needed
  • Apify MCP Server — Runs in the cloud, nothing to install · Needs a key
  • Actionbook — Runs in the cloud, nothing to install · No key needed
  • Flowershow — Runs in the cloud, nothing to install · No key needed

README from the maker

Open the README

Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.

a11yscope-mcp

WCAG 2.2 AA checks for AI coding agents. The same engine as the A11yScope Chrome extension, exposed as an MCP server so Claude Code, Cursor, Claude Desktop and other MCP clients can audit the pages they build and fix what they find.

Runs locally in headless Chrome. Nothing is uploaded, no account, no telemetry.

Install

Claude Code

claude mcp add a11yscope -- npx -y a11yscope-mcp

Cursor / Claude Desktop / any MCP client — add to the MCP config:

{

"mcpServers": { "a11yscope": { "command": "npx", "args": ["-y", "a11yscope-mcp"] } } }

Needs Node 20 or newer and a Chromium-based browser. Installing downloads nothing: the first scan uses the Chrome, Chromium, Edge or Brave already on the machine, and only if none is found does it fetch a Chrome for Testing build (~150 MB, once) into Puppeteer's cache. To point it at a specific browser, set A11YSCOPE_CHROME to the executable path.

Tools

ToolWhat it does
scan_pageLoads a URL or a local HTML file in headless Chrome and returns violations grouped by rule, each with a CSS selector, an HTML snippet and a message that says what to change.
scan_htmlSame, for an HTML string the agent just generated. Pass base_url if the markup references stylesheets on a reachable server; otherwise inline the CSS, since contrast checks need computed styles.
list_rulesThe 31 checks, each with its WCAG 2.2 success criteria, level, impact and fix guidance.

Options on both scan tools: include_review (items that need a human decision), include_passed, max_findings_per_rule, viewport size. scan_page also takes wait_ms for pages that render late. If a site answers with a bot check (Cloudflare "Just a moment…" and the like), scan_page refuses with an error rather than scanning the interstitial, which would come back almost clean and mean nothing.

Typical prompt: *"Scan http://localhost:3000 with a11yscope and fix every violation, then scan again."*

Reading a result

Every rule comes back with a status (failed, review, passed or inapplicable) and a checked count: how many elements of the kind the rule targets were in the DOM (every for img-alt, every link for link-name, 1 for page-level rules). A rule with nothing to test is inapplicable, not passed, and the summary splits rulesPassed from rulesNotApplicable. So "fix it, then scan again" has a tell: if img-alt went from 3 checked to 0 checked, the images were deleted, not described. excluded is how many of the checked elements the rule skipped as hidden (aria-hidden, display:none) or decorative (role="presentation"). A scan that goes from checked 3 / excluded 0 to checked 3 / excluded 3 means the images were hidden, not described; genuine decorative images exist, so treat that as a question for a human. Compare checked and excluded before and after, not just the violation count. Alt text that is a file name or a filler word (image, photo, icon…) is flagged by img-alt-redundant.

scan_html adds notes when the markup is a fragment (page-level checks then describe the fragment, not the page it will live in) or has no stylesheet (contrast and focus results reflect browser defaults).

Scope: the top document plus every same-origin frame inside it, at any depth. Findings from a frame carry the frame's path in their selector (iframe#chat >>> button), and page-level checks (language, title, h1, landmarks, skip link, heading order) apply to the top document only. Cross-origin frames are third-party content the author cannot change, so they are counted in summary.iframesNotEntered and named in a note, not scanned. Open shadow roots are entered the same way; closed shadow roots cannot be read by anything that runs in the page.

What it checks

Text alternatives (images, form labels, buttons, links, frames, SVG), colour contrast with the large-text and bold exemptions applied and translucent backgrounds composited, document structure (language, title, headings, main landmark, skip link, tables, lists, duplicate ids), and keyboard, pointer and ARIA (zoom lock, positive tabindex, aria-hidden focusable, nested interactive controls, 24×24 target size, autoplay, captions, invalid roles, required ARIA states, autocomplete, focus visibility).

Calibrated against sites built by accessibility practitioners: gov.uk, webaim.org, deque.com, a11yproject.com and w3.org/WAI all report zero violations. Anything reported there is treated as our bug until proven otherwise, and false-positive reports are the most useful thing you can send.

What it does not do

Automated checks find roughly a third of accessibility barriers. A clean result is a good sign, not a conformance claim. Whether alt text is accurate, whether a page makes sense in a screen reader, whether a keyboard user can finish a task — no tool can answer those, and this one does not pretend to. Anything it cannot decide comes back as review, not as pass or fail. It is not a substitute for an expert evaluation and does not certify compliance with the EAA, ADA, KWCAG or any other standard.

Licence

Copyright © 2026 Perceivable. Free to install and run, including commercially, through npm and MCP clients. The engine source is published so that "nothing leaves your machine" can be verified rather than trusted; it is not open source, and no licence is granted to copy, modify or redistribute it or to publish derivative works. Full terms: the LICENSE file in this package and at the repository root. Problems and false positives: https://github.com/perceivable/a11yscope/issues.