UD5 Toolkit
Print Contrast Simulator - Online See How It Looks on Paper
Upload an image and see a rough simulation of how it might look when printed. Highlights areas that may lose detail.
Tag: Color Contrast & Accessibility Checker
13+ toolsLive Site Contrast Checker - Online Audit By URL
Enter a URL and fetch its text/background colors to perform a bulk contrast check. See warnings for WCAG violations.
Real‑Sample Contrast Checker - Online See Paragraph
See how a full paragraph looks with your chosen text and background colors. Not just a ratio; the real appearance.
Color Contrast Ratio Tester - Online WCAG AA/AAA Check
Enter foreground and background colors to instantly see the contrast ratio and pass/fail for AA and AAA. Simple and fast.
Color Readability Tester - Online Visual Contrast Meter
Paste body text and test different font/background combos. See an actual passage rendered, not just a ratio. True feel for legibility.
APCA Contrast Checker - Online New Accessible Perceptual Contrast
Check the Accessible Perceptual Contrast Algorithm (APCA) ratio. The next‑generation contrast method for WCAG 3.
CSS Filter Functions Playground - Online Visual Adjustments
Chain multiple CSS filter functions and see the result on an image. Copy the filter string. No upload.
Accessible Color Scale Builder - Online Generate Tints/Shades with Contrast
Pick a base color and generate a 10‑step scale where each step meets a specific contrast ratio against white or black. Export as CSS custom properties.
Bulk Color Contrast Checker - Online WCAG Validation
Paste a list of foreground/background color pairs and instantly see which pass AA/AAA. Perfect for checking entire style guides.
Image Contrast Enhancer - Online Histogram Equalization
Automatically improve the contrast of dark or washed‑out photos using histogram equalization. One‑click auto‑tune. All canvas‑based.
Accessible Color Contrast Finder - Online WCAG 2.1 Helper
Given a background color, this tool suggests foreground colors that meet AA/AAA contrast ratios. Works for all vision types.
Image Brightness & Contrast Slider - Online Photo Tune
Quickly adjust the brightness and contrast of an image with live preview sliders. Download the tuned photo. Canvas.
Accessible Color Contrast Grid - Online Test Combinations
Enter a palette of colors and see a grid showing whether each foreground/background pair passes AA or AAA contrast. Must for designers.