Vinkius
Accessibility Prover

Accessibility Prover MCP for AI. Validate your components before they are coded.

Claude Claude
ChatGPT ChatGPT
Cursor Cursor
Gemini Gemini
Windsurf Windsurf
VS Code VS Code
JetBrains JetBrains
Vercel Vercel
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Works with every AI agent you already use

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Accessibility Prover MCP on Cursor AI Code EditorAccessibility Prover MCP on Claude Desktop AppAccessibility Prover MCP on OpenAI Agents SDKAccessibility Prover MCP on Visual Studio CodeAccessibility Prover MCP on GitHub Copilot AI AgentAccessibility Prover MCP on Google Gemini AIAccessibility Prover MCP on Lovable AI DevelopmentAccessibility Prover MCP on Mistral AI AgentsAccessibility Prover MCP on Amazon AWS Bedrock

Connect to your AI in seconds.

Accessibility Prover validates component specifications against WCAG 2.2 AA standards before you write code. This MCP checks five critical areas: semantic HTML structure, keyboard focus traps, contrast ratios, screen reader readiness, and motion safety.

It acts as a pre-build gate, catching invisible barriers like div soup or inaccessible animations that automated linters miss.

What your AI can do

Validate accessibility

It validates if your UI design meets all WCAG 2.2 AA standards by checking semantic HTML, keyboard navigation, contrast ratios, screen reader context, and motion safety.

Validate semantic structure

It checks if you used correct HTML elements (like <button> for actions) instead of relying on non-semantic tags like <div>.

Enforce keyboard accessibility

You ensure every interactive element is reachable via the Tab key, and that modals properly trap focus so users don't get lost in the DOM.

Verify contrast compliance

It measures foreground/background color ratios across all states (default, hover, focus) to ensure they meet the minimum 4.5:1 standard.

Ensure screen reader compatibility

The tool verifies that images have descriptive alt texts and that icon buttons include necessary aria-label attributes for assistive technology.

Manage motion risk

You confirm that all animations respect user preferences, specifically checking for the required @media (prefers-reduced-motion) overrides.

Included with Plan

Waiting for input…

AI Agent

Accessibility Prover: 1 Tool Available

This single tool lets you run structured checks on your UI components to validate semantic HTML, keyboard navigation, contrast ratios, and ARIA annotations before development begins.

Make your AI actually useful.

Add this MCP to Claude, Cursor, or Windsurf and your AI stops guessing. It gets real tools to look things up, take action, and handle the stuff you keep doing by hand.

Start using Accessibility Prover on Vinkius

Validate Accessibility

It validates if your UI design meets all WCAG 2.2 AA standards by checking semantic HTML, keyboard navigation, contrast ratios, screen...

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Pick your AI client below to get set up. Just create a Vinkius account, subscribe, and you're instantly up and running. We handle the entire backend infrastructure, delivering out-of-the-box support for HTTPS Streamable, SSE, and OAuth2—zero messy routing required.

Claude AI

Claude AI

1

Open Claude Settings

Go to claude.ai, click your profile icon, then navigate to Customize → Connectors.

2

Add Custom Connector

Click the "+" button and select Add custom connector. Paste your Vinkius endpoint URL:

https://edge.vinkius.com/[YOUR_TOKEN_HERE]/mcp

Replace [YOUR_TOKEN_HERE] with your token from cloud.vinkius.com. For OAuth-protected servers, expand Advanced settings to add credentials.

3

Start a conversation

Open a new chat. The Accessibility Prover integration is available immediately — no restart needed.

Choose How to Get Started

Build a custom MCP for your own tools, or connect a ready-made integration from our catalog.

Build Your Own

Turn any API into an MCP. Import a spec, define Agent Skills, or deploy with MCPFusion.

  • Import from OpenAPI, Swagger, or YAML specs
  • Create Agent Skills with progressive disclosure
  • Deploy to edge with MCPFusion framework
  • Built in DLP, auth, and compliance on every call
  • Real time usage dashboard and cost metering
  • Publish to catalog or keep private
Start building

Make Your AI Do More

Start with Accessibility Prover, then connect any of our 5,100+ other servers whenever your AI needs more. One click, no limits.

  • Use this MCP plus 5,100+ others, all in one place
  • Add new capabilities to your AI anytime you want
  • Every connection is secured and compliant automatically
  • Track usage and costs across all your servers
  • Works with Claude, ChatGPT, Cursor, and more
  • New servers added to the catalog every week
Accessibility Prover MCP server cover

Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by WCAG 2.2. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.

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Works with Claude, ChatGPT, Cursor, and more

The Model Context Protocol standardizes how applications expose capabilities to LLMs. Instead of operating in isolation, your AI gains direct access to external platforms, live data, and real-world actions through secure, standardized connections.

This connection provides 1 powerful capabilities that interface natively with Claude, ChatGPT, Cursor, and other compatible AI platforms. No middleware. No custom integration required.

It’s a pain to keep track of every little detail.

Today, fixing accessibility often means multiple manual checks. You have to verify that every button uses a semantic `<button>` and not just a clickable `<div>`. Then you manually check the contrast ratio for default, hover, and focus states across dozens of color combinations. If you miss one label or forget to add the correct `aria-label` to an icon, the entire component fails.

With this MCP, you input the component's full specification once. It runs all those checks—semantic structure, contrast ratios, alt text, focus traps—and immediately gives a structured verdict. You get actionable fixes before it ever becomes code.

You Get Structured Compliance with validate_accessibility

The tedious process of coordinating between design color palettes, developer focus order, and legal compliance documentation disappears. The MCP consolidates all those rules into one structured input that passes through five distinct decision pivots.

What's different now is the shift from remediation to prevention. You build accessible components correctly the first time, every time.

What your AI can actually do with this

Writing UI components means thinking about more than just how they look. Accessibility Prover forces you to think about compliance from the start. Instead of waiting for a painful post-launch audit—or worse, facing legal fines under regulations like EAA 2025—you run this MCP early in the design process. It validates your component specifications against WCAG 2.2 AA standards using structured reasoning, not just by scanning raw HTML.

You connect it via Vinkius and use it as a proactive gate. This means your AI agent or front-end developer can't generate code until the tool confirms five key things: that you used proper semantic tags (like <button> instead of a clickable <div>), that keyboard users can reach every element, that color contrast passes 4.5:1, and that screen readers have all the necessary labels.

It’s about catching structural flaws before they even hit your repository.

Built · Hosted · Managed by Vinkius Accessibility Prover MCP - Validate Web Accessibility
Server ID 019e599a-f27a-71df-a461-772595c49ff6
Vinkius Inspector
Compliance Grade A+
Score 100/100
Vinkius Inspector Badge — Score 100/100

Questions you might have

Why does Accessibility Prover reject divs with click handlers? +

A has no native keyboard interactivity, no focusability, and no implicit ARIA role. Adding `onclick` creates a visual button that keyboard and screen reader users cannot operate. Native elements provide focus, Enter/Space activation, and the 'button' role automatically — no extra JavaScript required.

What is a focus trap and when is it required? +

A focus trap constrains Tab navigation inside a specific element — typically a modal, dialog, or dropdown — so users cannot navigate to the underlying page while the overlay is active. WCAG 2.4.3 (Focus Order) requires it for all modal dialogs. Without it, a keyboard user can Tab behind the modal into invisible content.

Does Accessibility Prover check contrast across all interactive states? +

Yes. The contrastCompliant pivot validates foreground/background color combinations across five states: default, hover, focus, active, and disabled. A button that passes contrast in its default state but fails on hover (e.g., light gray text on white) is flagged as CONTRAST_FAILING.

How is this different from axe-core or Lighthouse? +

axe-core and Lighthouse scan rendered HTML in a browser — they detect violations after the code is built and running. Accessibility Prover validates UI specifications before code is written. It reasons about component behavior, keyboard flows, and interaction states at the design level, catching architectural issues that post-build scanners cannot see because they only inspect the final DOM.

Can I use Accessibility Prover with an AI coding agent? +

Yes — that is a primary use case. AI coding agents default to div-based layouts because divs are syntactically simpler. Accessibility Prover acts as a guardrail: the agent submits its component specification, the prover validates it against 5 pivots, and the agent receives a structured verdict with specific fixes before writing code.

What does the European Accessibility Act (EAA 2025) mean for my product? +

Since June 2025, the EAA requires all digital products and services sold in the EU to meet accessibility standards equivalent to WCAG 2.1 AA (with WCAG 2.2 AA as the recommended benchmark). Non-compliance carries fines up to 5% of annual revenue and potential market withdrawal. Accessibility Prover helps demonstrate compliance as a build-time gate, creating an auditable validation record.

What input format does Accessibility Prover expect? +

Submit each component as structured text covering 5 dimensions: (1) Layout — the HTML elements and hierarchy, (2) Keyboard — tab order, focus indicators, focus traps, (3) Contrast — foreground and background hex values with computed ratio, (4) Screen Reader — alt texts, aria-labels, form-label associations, (5) Motion — animation properties and prefers-reduced-motion handling. The tool reasons about each dimension independently.

Does Accessibility Prover support WCAG 2.2 AAA? +

The tool validates against WCAG 2.2 AA, which is the legally required level under the EAA 2025 and the practical target for most products. AAA requirements (e.g., 7:1 contrast ratio, sign language interpretation) are not enforced — they are aspirational goals that few products achieve fully.

Built & Managed by Vinkius 30s setup 1 tools

We've already built the connector for Accessibility Prover. Just plug in your AI agents and start using Vinkius.

No hosting. No infrastructure. No complex setup.
All 1 tools are live and waiting. You're up and running in seconds.

Vinkius runs on Claude Claude
Vinkius runs on ChatGPT ChatGPT
Vinkius runs on Cursor Cursor
Vinkius runs on Gemini Gemini
Vinkius runs on Windsurf Windsurf
Vinkius runs on VS Code VS Code
Vinkius runs on JetBrains JetBrains
Vinkius runs on Vercel Vercel
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