#51616B
Closest named color: Slate (#516572). oklch(48.3% 0.025 235.5), rgb(81, 97, 107).
Aa
White text reads best on this color (6.41:1).
About this color
#51616B is a medium-dark close to neutral grey. In OKLCH its lightness is 48%, its chroma 0.025. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.014 away. White text reads best on it, at 6.41:1.
| Hue family | Neutrals |
| Lightness | medium-dark (48%) |
| Chroma | close to neutral grey (0.025) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.27:1 |
| White text | 6.41:1 |
Values
| HEX | #51616B |
| RGB | rgb(81, 97, 107) |
| HSL | hsl(203, 14%, 37%) |
| OKLCH | oklch(48.3% 0.025 235.5) |
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 #51616B | 6.41:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #51616B | 3.27:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #51616B text on white | 6.41:1 | AA | Lc 81.9 | Fine for body text |
| #51616B text on black | 3.27:1 | AA large text | Lc -20.0 | 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
#E8EAEC
oklch(93.6% 0.003 247.9)
-
Step 200
200
#D5DADD
oklch(88.5% 0.007 233.7)
-
Step 300
300
#B9C2C7
oklch(80.9% 0.012 231.7)
-
Step 400
400
#95A3AB
oklch(70.7% 0.02 232.6)
-
Step 500
500
#7B8C97
oklch(63% 0.026 236.2)
-
Step 600
600
#647681
oklch(55.5% 0.027 234.8)
-
Step 700
700 (this color)
#51616B
oklch(48.3% 0.025 235.5)
-
Step 800
800
#445159
oklch(42.7% 0.021 235)
-
Step 900
900
#394349
oklch(37.6% 0.017 234.2)
-
Step 950
950
#22272B
oklch(26.9% 0.01 242.1)
#51616B 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) | #5C606C | 0.016 |
| Deuteranopia (no green cones) | #595D6B | 0.016 |
| Tritanopia (no blue cones) | #4A6464 | 0.020 |
| Achromatopsia (no color) | #5F5F5F | 0.026 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51616B
#51616B
oklch(48.3% 0.025 235.5)
- #6A5B51
#6A5B51
oklch(48.3% 0.025 55.7)
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 #51616B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.014
- Dusty Grape #545775 ΔE 0.039
- YInMn Blue #415A77 ΔE 0.040
- Dim Gray #696969 ΔE 0.046
- Denim #3B638C ΔE 0.056
- Dusk #4E5481 ΔE 0.061
- Dark Aqua #05696B ΔE 0.062
- Metallic Blue #4F738E ΔE 0.066
Use #51616B 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.