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Gradient Text Contrast Checker

Standard contrast checkers compare one text color against one solid background, which is useless the moment you put text over a gradient. The contrast changes continuously across a gradient, so the only number that matters for accessibility is the lowest contrast anywhere the text sits, and that worst spot is easy to miss by eye. This tool finds it for you. Set the gradient's start and end colors and angle, pick your text color, and it samples the gradient across one hundred points, computes the WCAG contrast ratio at each, and reports the minimum ratio along with the exact position where it occurs. You get clear AA and AAA pass or fail badges for both normal and large text, a live preview of the text on the actual gradient, and an optional dark overlay control that shows how much tint it takes to make white text pass, with the matching CSS. Everything updates instantly and runs in your browser.

Readable text?

Worst contrast across gradient

0:1

at 0% of the gradient

CSS

How to Check Contrast Over a Gradient
  1. Set the gradient - Pick the start and end colors with the color pickers or hex fields, and drag the angle slider to match your design.
  2. Set the text color - Choose the color of the text that sits on the gradient, and select Normal or Large text so the right WCAG threshold is used.
  3. Read the worst-case ratio - The big number is the minimum contrast across the whole gradient, and the position label shows where it bottoms out.
  4. Check the AA and AAA badges - Green means the text passes at every point; red means it fails somewhere along the gradient.
  5. Fix it if needed - Tick Add dark overlay and raise the opacity until it passes, then copy the generated CSS (gradient plus overlay pseudo-element).
Why This Tool?
 Gradient backgrounds are everywhere in modern UI, and most of them quietly fail accessibility because designers checked the contrast at one point (usually the darkest end) and assumed the rest was fine. WCAG requires 4.5:1 for normal text and 3:1 for large text, and that has to hold everywhere the text overlaps the background, not on average. Sampling the gradient and reporting the minimum is the conservative, correct way to test it, and it is exactly what single-color checkers from the big color tools cannot do. 
 The contrast math here follows the WCAG 2 relative luminance formula: each sampled background color is linearized, weighted, and compared to the text color's luminance to produce a ratio. The dark overlay option models the common real-world fix, a semi-transparent black layer between the gradient and the text, by compositing the overlay onto each sampled color before measuring, so the pass or fail verdict reflects what users will actually see. 
 Catching a failing gradient before launch costs one slider drag here; catching it after launch means an accessibility complaint or a redesign. Pair this with a sensible text size and you can use bold gradient backgrounds confidently instead of avoiding them.