#51636F
Closest named color: Slate (#516572). oklch(48.9% 0.029 237.4), rgb(81, 99, 111).
Aa
White text reads best on this color (6.24:1).
About this color
#51636F is a medium-dark close to neutral grey. In OKLCH its lightness is 49%, its chroma 0.029. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.007 away. White text reads best on it, at 6.24:1.
| Hue family | Neutrals |
| Lightness | medium-dark (49%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.36:1 |
| White text | 6.24:1 |
Values
| HEX | #51636F |
| RGB | rgb(81, 99, 111) |
| HSL | hsl(204, 16%, 38%) |
| OKLCH | oklch(48.9% 0.029 237.4) |
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 #51636F | 6.24:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #51636F | 3.36:1 | AA large text | Lc 22.9 | Dividers and decoration only |
| #51636F text on white | 6.24:1 | AA | Lc 81.1 | Fine for body text |
| #51636F text on black | 3.36:1 | AA large text | Lc -20.8 | 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
#F4F6F6
oklch(97.2% 0.002 197.1)
-
Step 100
100
#E7EAEC
oklch(93.5% 0.004 236.5)
-
Step 200
200
#D4DADE
oklch(88.5% 0.009 236.6)
-
Step 300
300
#B9C2C9
oklch(80.9% 0.014 241)
-
Step 400
400
#94A3AD
oklch(70.7% 0.022 236.9)
-
Step 500
500
#7A8C99
oklch(63% 0.029 239.3)
-
Step 600
600
#627684
oklch(55.5% 0.032 238.7)
-
Step 700
700 (this color)
#51636F
oklch(48.9% 0.029 237.4)
-
Step 800
800
#43515B
oklch(42.7% 0.024 239.2)
-
Step 900
900
#38434B
oklch(37.6% 0.02 239.7)
-
Step 950
950
#21272C
oklch(26.9% 0.013 243.3)
#51636F 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) | #5E6270 | 0.019 |
| Deuteranopia (no green cones) | #5A5F6F | 0.017 |
| Tritanopia (no blue cones) | #486667 | 0.022 |
| Achromatopsia (no color) | #606060 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51636F
#51636F
oklch(48.9% 0.029 237.4)
- #6D5C50
#6D5C50
oklch(48.8% 0.029 57.2)
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 #51636F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.007
- Dusty Grape #545775 ΔE 0.041
- YInMn Blue #415A77 ΔE 0.041
- Dim Gray #696969 ΔE 0.043
- Denim #3B638C ΔE 0.052
- Metallic Blue #4F738E ΔE 0.058
- Dusk #4E5481 ΔE 0.062
- Dark Aqua #05696B ΔE 0.062
Use #51636F 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.