# Design & Color Tools

> Check color contrast ratios for WCAG compliance, simulate color blindness, and calculate aspect ratios — free design helpers that run entirely in your browser.

## Tools in this collection

- [Color Palette + WCAG Checker](https://www.teafun.cyou/tools/color-palette-wcag/) — Check contrast ratios, AA/AAA compliance, generate palette variants, and export CSS or Tailwind v4 color tokens locally.
- [Color Blindness Test](https://www.teafun.cyou/tools/colorblind/) — Test your color vision with Ishihara-style plates optimized for gamers.
- [Aspect Ratio Calculator](https://www.teafun.cyou/tools/aspect-ratio/) — Calculate aspect ratios instantly. Convert dimensions, solve for missing sides, and browse 2025/2026 social media image sizes.

## FAQ

### Which contrast ratio do I need to pass WCAG AA?

Normal text requires a 4.5:1 ratio; large text (18pt+ or 14pt bold) requires 3:1. The WCAG Color Contrast checker shows both thresholds and your pass/fail status instantly.

### How does the color blindness simulator work?

It applies standard daltonisation matrices to the input colors to approximate how they appear with different types of color vision deficiency — all computed locally in your browser.