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.
Collection
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.
3 tools in this category
← HomeWhy this collection exists
Accessible and well-proportioned visuals start with the right numbers. This collection groups the TeaFun tools that designers, developers, and content creators use to check color accessibility, simulate vision conditions, and lock in correct proportions.
Common use cases
- Verify foreground and background color combinations meet WCAG AA and AAA contrast standards.
- Preview how your palette looks to users with protanopia, deuteranopia, or other color vision differences.
- Calculate and lock in the correct aspect ratio when cropping images or sizing video embeds.
Featured tools
Color Palette + WCAG Checker
Check contrast ratios, AA/AAA compliance, generate palette variants, and export CSS or Tailwind v4 color tokens locally.
Color Blindness Test
Test your color vision with Ishihara-style plates optimized for gamers.
Aspect Ratio Calculator
Calculate aspect ratios instantly. Convert dimensions, solve for missing sides, and browse 2025/2026 social media image sizes.
FAQ
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.