Skip to content
Vinkius

WCAG Contrast Checker Connector for AI agents.

3 live capabilities

Verify web accessibility compliance and color contrast ratios instantly.

Live agent request WCAG Contrast Checker / Connector

Waiting for input…

AI Agent

Why people use WCAG Contrast Checker

WCAG Contrast Checker for Web Accessibility Testing

With this Connector, you just describe the colors you're using to your agent. It handles the math and the logic, giving you a clear pass or fail status and even suggesting fixes. You get a fully compliant UI without the constant tab-switching.

  • Claude
  • ChatGPT
  • Gemini
  • Cursor
  • Visual Studio Code
  • Windsurf

What Vinkius changes

You get instant, accurate accessibility data without leaving your editor.

Use it from Claude, ChatGPT, Cursor or another AI client you already have.

One account · 6,100+ Connectors

  1. Real-world use case 01

    Checking a new brand orange

    A designer wants to know if a new brand orange works on a white background.

  2. Real-world use case 02

    Fixing a failed button

    A developer finds a button that fails accessibility during a test.

  3. Real-world use case 03

    Bulk auditing a landing page

    A QA engineer needs to verify that every primary color on a landing page is compliant.

Complete set · 3capabilities

The complete WCAG Contrast Checker capability set.

These are the exact actions your AI can choose when you ask it to work with WCAG Contrast Checker.

Capability set01 / 01

01—03

3 capabilities in this set.

Part of 3 available through WCAG Contrast Checker.

  1. 01 Capability

    Find compliant suggestion

    Suggests a new background color that meets a specific accessibility target by minimally adjusting the current color's lightness. It helps you fix issues without ruining your design.

  2. 02 Capability

    Audit palette

    Validates a collection of colors to ensure they all satisfy a specific accessibility standard. Use this to check your entire brand kit at once.

  3. 03 Capability

    Calculate contrast

    Determines the exact contrast ratio and accessibility pass/fail status for two specific colors. This gives you a clear yes or no on readability.

Set up in minutes

One URL. Then ask WCAG Contrast Checker to work.

Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use WCAG Contrast Checker from the conversation.

Choose your client

Live preview
Advanced clients IDE · CLI

Claude · Web + desktop

Official guide ↗

Connector URL · ready to paste

Streamable HTTP
https://edge.vinkius.com/vk_preview_Lfv8VqyLJIKyGy3fae9w4KOMmwDTCPhqWj1LLrE1/mcp
  1. Step 01

    Open Connectors

    In Claude Web or Claude Desktop, open Settings and choose Connectors.

  2. Step 02

    Add the URL

    Choose Add custom connector, name it WCAG Contrast Checker, and paste the URL above.

  3. Step 03

    Turn it on in chat

    Select +, open Connectors, and enable WCAG Contrast Checker for the conversation.

Where the request belongs

Work WCAG Contrast Checker can move forward.

Built around the request

This is for the frontend developer who's tired of accessibility bugs popping up during QA, the UI designer trying to keep a brand palette consistent, and the web auditor who needs to verify thousands of color pairs across a large site.

01

Frontend Developer

Debugging CSS to ensure buttons, links, and labels are readable for all users.

02

UI Designer

Validating a new brand palette for high-contrast requirements during the mockup phase.

03

Accessibility Auditor

Running bulk checks on a site's color scheme to ensure legal compliance.

Build the capability set

Add more capabilities.

Each Connector adds new actions and data without changing how you work.

Browse Connectors
Color Contrast Checker logo
01 8 capabilities

Color Contrast Checker

Check WCAG color contrast compliance via AI. verify text readability against backgrounds for accessible, inclusive web design.

View Connector
Color Difference Engine logo
02 4 capabilities

Color Difference Engine

Calculate perceptual color differences using CIE76, CIEDE2000, and OKLAB models.

View Connector
Color Format Converter logo
03 3 capabilities

Color Format Converter

Convert between HEX, RGB(A), HSL(A), HSV, and CMYK with precision.

View Connector
Alt-Text Accessibility Checker logo
04 5 capabilities

Alt-Text Accessibility Checker

Validate image alt-text against WCAG standards for length, redundancy, and descriptiveness.

View Connector
Palette Generator logo
05 4 capabilities

Palette Generator

Generate perceptually uniform color palettes using OKLCH space and WCAG accessibility standards.

View Connector
Deterministic Color Engine logo
06 3 capabilities

Deterministic Color Engine

Equip your AI with precise UI design capabilities. Deterministically convert HEX/RGB/HSL, manipulate luminance, and generate mathematically perfect palettes.

View Connector

Bring your own AI

Change the model, client or framework. Keep WCAG Contrast Checker connected.

  • Claude
  • ChatGPT
  • Gemini
  • Cursor
  • VS Code
  • Windsurf
  • ZCode
  • Cline
  • Zed
  • Continue
  • Kiro
  • Roo Code
  • Zencoder
  • Goose
  • Void
  • Augment Code
  • Amp
  • Qodo
  • Tabnine
  • Pieces
  • Sourcegraph Cody
  • JetBrains
  • Warp
  • Amazon Q
  • Antigravity
  • BoltAI
  • Raycast
  • Jan
  • LM Studio
  • AnythingLLM
  • Open WebUI
  • Msty
  • Cherry Studio
  • LibreChat
  • TypingMind
  • Chorus
  • 5ire
  • n8n
  • LangChain
  • LlamaIndex
  • CrewAI
  • Vercel AI SDK

Before you connect

Questions about WCAG Contrast Checker.

The practical details behind the request, access and result.

How does WCAG Contrast Checker help my web project?

It lets you instantly verify that your UI colors are readable. Your agent can check hex codes against accessibility standards so you don't have to do the math manually.

Can WCAG Contrast Checker check for the new APCA standards?

Yes, it calculates results for both the older WCAG 2.1 models and the newer APCA (WCAG 3.0) models to keep your designs future-proof.

How do I use WCAG Contrast Checker to fix a bad color?

Just ask your agent to suggest a compliant color for a specific pair. It will find a new background or text color that meets your target with minimal changes.

Does WCAG Contrast Checker work for dark mode?

Absolutely. It checks any color pair you provide, making it perfect for validating dark mode themes and high-contrast requirements.

Can I check an entire brand palette at once?

Yes, you can use the capability to audit a whole collection of colors. This ensures your entire brand kit meets accessibility standards consistently.

What are AA and AAA levels in WCAG Contrast Checker?

These are different levels of accessibility requirements. The capability checks your colors against these specific thresholds to ensure you meet your project's goals.

What standards does this capability support?

The capability supports WCAG 2.1 (Contrast Ratio) and WCAG 3.0 (APCA - Advanced Perceptual Contrast Algorithm).

How can I find a color that passes AA standards?

You can use the find_compliant_suggestion capability. Provide your current color and specify 'AA_NORMAL' as the target level.

Can I check multiple colors at once?

Yes, use the audit_palette capability by providing a JSON array of foreground colors and a single background color.

One connection away

Give your agent a direct line to WCAG Contrast Checker.

Connect WCAG Contrast Checker once. Keep it beside 6,100+ managed Connectors when the next task needs more.

Explore every Connector No credit card required · Free tier available