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Vinkius

WCAG Color Contrast Connector for AI agents.

8 live capabilities

Audit WCAG accessibility compliance for your web and app designs.

Live agent request WCAG Color Contrast / Connector

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AI Agent

Why people use WCAG Color Contrast

Color Contrast Checker for WCAG Accessibility Compliance

With this Connector, you just tell your agent to check the colors. You don't have to leave your editor or your chat window. You get a clear pass or fail and a suggested fix immediately.

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

What Vinkius changes

You get instant accessibility validation without leaving your workspace.

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

One account · 5,900+ Connectors

  1. Real-world use case 01

    Checking a brand palette

    A designer wants to know if a new brand blue is accessible on white.

  2. Real-world use case 02

    Building a dark mode toggle

    A developer wants to ensure their new dark mode surface works with white text.

  3. Real-world use case 03

    Batch-checking design tokens

    An auditor needs to verify 20 different buttons.

Complete set · 8capabilities

The complete WCAG Color Contrast capability set.

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

Capability set01 / 02

01—04

4 capabilities in this set.

Part of 8 available through WCAG Color Contrast.

  1. 01 Capability

    Check black text on bg

    Checks the contrast of pure black text against a specific background color. Use this to verify basic readability.

  2. 02 Capability

    Check color contrast

    Calculates the ratio between a foreground and background color pair. Use this to audit visual accessibility.

  3. 03 Capability

    Check danger text contrast

    Checks contrast of standard red danger text on a background. Use this to verify alert visibility.

  4. 04 Capability

    Check dark mode surface

    Checks contrast against a standard dark mode surface. Use this to ensure low-light designs are readable.

Capability set02 / 02

05—08

4 capabilities in this set.

Part of 8 available through WCAG Color Contrast.

  1. 05 Capability

    Check light mode surface

    Checks contrast against a standard light mode surface. Use this to ensure light themes are readable.

  2. 06 Capability

    Check text on pure black

    Checks the contrast of a text color against a pure black background. Use this for high-contrast UI checks.

  3. 07 Capability

    Check text on pure white

    Checks the contrast of a text color against a pure white background. Use this for standard content audits.

  4. 08 Capability

    Check white text on bg

    Checks the contrast of pure white text against a specific background. Use this to verify button labels.

Set up in minutes

One URL. Then ask WCAG Color Contrast to work.

Claude and ChatGPT only need the Connector URL. Copy it once, add it in settings, and use WCAG Color Contrast 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_ToTQpdJuObTgdPgJyLWHlH7B6StfiSmankHl08eC/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 Color Contrast, and paste the URL above.

  3. Step 03

    Turn it on in chat

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

Where the request belongs

Work WCAG Color Contrast can move forward.

Built around the request

This is for designers and developers who are tired of manual accessibility audits and want to ensure their products are inclusive by default.

01

UI/UX Designer

Checking if a new brand color palette meets contrast requirements for buttons and labels.

02

Web Developer

Verifying that dynamic content remains readable against different background colors during coding.

03

Accessibility Auditor

Quickly batch-checking design tokens to ensure they comply with legal accessibility standards.

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 1 capability

Color Contrast Checker

Instantly verify if your text is readable on any background. WCAG 2.1 AA/AAA compliance in one call. the AI guesses ratios, this engine calculates them.

View Connector
WCAG Contrast Checker logo
02 3 capabilities

WCAG Contrast Checker

Evaluate color contrast compliance against WCAG 2.1 and WCAG 3.0 (APCA) standards.

View Connector
Deterministic Color Engine logo
03 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
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
Color Difference Engine logo
05 4 capabilities

Color Difference Engine

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

View Connector
WCAG.com Accessibility logo
06 4 capabilities

WCAG.com Accessibility

Audit web accessibility. check compliance and guidelines via AI.

View Connector

Bring your own AI

Change the model, client or framework. Keep WCAG Color Contrast 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 Color Contrast.

The practical details behind the request, access and result.

What does Color Contrast Checker do?

It checks if your text colors are readable against your background colors based on WCAG standards. It gives you a ratio and tells you if it passes.

Can I use Color Contrast Checker for dark mode?

Yes, you can use it to check your dark mode surfaces specifically. It helps ensure your app stays accessible in low light.

Does this help with WCAG compliance?

Yes, it checks against the AA and AAA standards. This makes it much easier to meet legal accessibility requirements for web content.

How do I check a specific color pair?

Just tell your AI client the two hex codes. It will calculate the ratio and tell you if it's readable enough for different text sizes.

Can it check button colors?

It can check any color pair. You can provide the button color and the background color to see if the text on top is accessible.

Is this for web developers or designers?

It's for both. Designers use it for brand colors and developers use it to check UI components like buttons and alerts.

What accessibility standards does it check?

It checks against both WCAG 2.1 Level AA (minimum 4.5:1 for normal text, 3:1 for large text) and Level AAA (7:1 for normal text, 4.5:1 for large text).

One connection away

Give your agent a direct line to WCAG Color Contrast.

Connect WCAG Color Contrast once. Keep it beside 5,900+ managed Connectors when the next task needs more.

Explore every Connector No credit card required · Free tier available