#51667A
Closest named color: Slate (#516572). oklch(50.1% 0.041 247.4), rgb(81, 102, 122).
Aa
White text reads best on this color (5.94:1).
About this color
#51667A is a medium-dark, muted blue. In OKLCH its lightness is 50%, its chroma 0.041 and its hue 247°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.013 away. White text reads best on it, at 5.94:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.041) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.53:1 |
| White text | 5.94:1 |
Values
| HEX | #51667A |
| RGB | rgb(81, 102, 122) |
| HSL | hsl(209, 20%, 40%) |
| OKLCH | oklch(50.1% 0.041 247.4) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #51667A | 5.94:1 | AA | Lc -84.9 | Fine for body text |
| Black text on #51667A | 3.53:1 | AA large text | Lc 24.3 | Dividers and decoration only |
| #51667A text on white | 5.94:1 | AA | Lc 79.7 | Fine for body text |
| #51667A text on black | 3.53:1 | AA large text | Lc -22.1 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 700.
-
Step 50
50
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAED
oklch(93.6% 0.005 247.9)
-
Step 200
200
#D4DAE0
oklch(88.6% 0.011 247.9)
-
Step 300
300
#B7C2CD
oklch(80.9% 0.02 248.1)
-
Step 400
400
#91A3B4
oklch(70.7% 0.032 246.7)
-
Step 500
500
#768CA1
oklch(63% 0.041 247.2)
-
Step 600
600
#5F768C
oklch(55.6% 0.044 247.5)
-
Step 700
700 (this color)
#51667A
oklch(50.1% 0.041 247.4)
-
Step 800
800
#405161
oklch(42.7% 0.034 247.1)
-
Step 900
900
#37434F
oklch(37.7% 0.026 248.5)
-
Step 950
950
#20272E
oklch(26.9% 0.016 248.4)
#51667A with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #5E667B | 0.018 |
| Deuteranopia (no green cones) | #59627A | 0.015 |
| Tritanopia (no blue cones) | #446B6C | 0.036 |
| Achromatopsia (no color) | #646464 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51667A
#51667A
oklch(50.1% 0.041 247.4)
- #745F4B
#745F4B
oklch(50.1% 0.041 65.3)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #51667A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.013
- Denim #3B638C ΔE 0.041
- Metallic Blue #4F738E ΔE 0.043
- Dusty Grape #545775 ΔE 0.043
- YInMn Blue #415A77 ΔE 0.044
- Dim Gray #696969 ΔE 0.045
- Dusky Blue #475F94 ΔE 0.054
- Dusk #4E5481 ΔE 0.059
Use #51667A in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.