About WCAG 2.1 Contrast Ratio & Accessibility Checker (AA/AAA)

Check color contrast ratios between text and background colors according to WCAG 2.1 guidelines with instant AA and AAA compliance badges. Designed with zero server dependencies, this tool runs entirely inside your modern browser, guaranteeing fast response times, high privacy, and no latency.

How to Use This Tool

1. Enter your parameters, code, or values into the input controls above.
2. Watch the real-time calculations or preview update instantaneously.
3. Copy the formatted result or code directly into your clipboard with one click.

Key Advantages

• 100% Client-Side Processing: Your inputs never touch remote servers.
• Precision Calculations: Mathematical and algorithmic standards provide mathematically exact results.
• Zero Latency: Immediate feedback as you type or adjust sliders.

Frequently Asked Questions

Is this utility free to use?
Yes, all VibeTool utilities are 100% free and open for personal and commercial usage without limits.

Are my data or inputs stored?
No. Because all calculations execute directly inside your browser engine, your data never leaves your computer.