Color Foreground Background Swaps
Check a foreground/background pair in both normal and swapped directions.
What the Color Foreground Background Swaps does
Check a foreground/background pair in both normal and swapped directions. Blue text on white may pass while white text on the same blue can produce a different ratio Adjust the controls and the preview updates immediately, so you can dial in exactly what you want and copy the result straight into your project — no build step and no account.
One thing to keep in mind: Contrast ratios are symmetric mathematically, but UI meaning changes when roles are swapped.
Private and in your browser
Everything runs locally in your browser. Your input is never uploaded, so the tool stays fast and works offline, and the copy and download buttons always use the current result shown in the output panel.
Frequently Asked Questions
What does the Color Foreground Background Swaps do?
Check a foreground/background pair in both normal and swapped directions. Blue text on white may pass while white text on the same blue can produce a different ratio.
What should I keep in mind?
Contrast ratios are symmetric mathematically, but UI meaning changes when roles are swapped
Does it upload my input?
No. The Color Foreground Background Swaps runs entirely in your browser — your input is never uploaded, and it keeps working offline once the page has loaded.
Practical utilities for front-end design and implementation work.