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#1d1d1d on #0d9488 contrast ratio

4.50:1

Very dark grey text (#1d1d1d) on a dark teal (Tailwind teal-600) background (#0d9488) meets WCAG 2.2 level AA for normal text. It passes 4 of 5 checks below.

Swap: #0d9488 on #1d1d1d

Large text sample

Normal body text in #1d1d1d on #0d9488. The quick brown fox jumps over the lazy dog.

WCAG 2.2 results

WCAG 2.2 contrast results for #1d1d1d on #0d9488
Normal text — WCAG 1.4.3 AA4.5:1Pass
Large text — WCAG 1.4.3 AA3:1Pass
UI components & icons — WCAG 1.4.11 AA3:1Pass
Normal text — WCAG 1.4.6 AAA7:1Fail
Large text — WCAG 1.4.6 AAA4.5:1Pass

Nearest passing colours

How it looks with colour blindness

Simulated with the Machado et al. (2009) model at full severity.

  • Aa

    Protanopia (no red cones)

    4.94:1

  • Aa

    Deuteranopia (no green cones)

    4.21:1

  • Aa

    Tritanopia (no blue cones)

    4.67:1

  • Aa

    Achromatopsia (no colour)

    4.50:1

Try a different pair

Colours

Hex, rgb() or hsl(). Alpha is composited.

Permalink

Preview

Large heading text

Normal body text at 14 px. The quick brown fox jumps over the lazy dog.

Outlined buttonA text link

Colour-blindness preview

Simulated with Machado et al. (2009), full severity.

  • AaProtanopia (no red cones)4.94:1
  • AaDeuteranopia (no green cones)4.21:1
  • AaTritanopia (no blue cones)4.67:1
  • AaAchromatopsia (no colour)4.50:1

Contrast ratio

4.50:1

WCAG 2.2 contrast verdicts
CheckCriterionNeedsResult
Normal text1.4.3 AA4.5:1Pass
Large text1.4.3 AA3:1Pass
UI components & graphics1.4.11 AA3:1Pass
Normal text1.4.6 AAA7:1Fail
Large text1.4.6 AAA4.5:1Pass

Nearest passing colours

Same hue, lightness adjusted in OKLCH.

AA — 4.5:1

Already passes.

AAA — 7:1

Change text: no colour with this hue reaches the target.

Change background

#47b9ac · 7.06:1

Large text means at least 24 CSS px, or 18.66 CSS px bold. Ratios are truncated, never rounded, so 4.49:1 is shown as failing 4.5:1.

Questions about this pair

Is #1d1d1d on #0d9488 accessible?
Yes for WCAG 2.2 level AA: the contrast ratio is 4.50:1, above the 4.5:1 needed for normal text. It does not reach the 7:1 needed for AAA.
What is the contrast ratio of #1d1d1d and #0d9488?
4.50:1, calculated with the WCAG 2.2 relative luminance formula. The ratio is truncated, not rounded, so it never shows a failing pair as passing.

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