#51686D
Closest named color: Slate (#516572). oklch(50.1% 0.028 212.4), rgb(81, 104, 109).
Aa
White text reads best on this color (5.91:1).
About this color
#51686D is a medium-dark close to neutral grey. In OKLCH its lightness is 50%, its chroma 0.028. 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 5.91:1.
| Hue family | Neutrals |
| Lightness | medium-dark (50%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.55:1 |
| White text | 5.91:1 |
Values
| HEX | #51686D |
| RGB | rgb(81, 104, 109) |
| HSL | hsl(191, 15%, 37%) |
| OKLCH | oklch(50.1% 0.028 212.4) |
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 #51686D | 5.91:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #51686D | 3.55:1 | AA large text | Lc 24.5 | Dividers and decoration only |
| #51686D text on white | 5.91:1 | AA | Lc 79.6 | Fine for body text |
| #51686D text on black | 3.55:1 | AA large text | Lc -22.2 | 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
#E7EAEB
oklch(93.5% 0.004 219.5)
-
Step 200
200
#D4DADC
oklch(88.4% 0.007 219.6)
-
Step 300
300
#B7C3C6
oklch(80.9% 0.014 214.4)
-
Step 400
400
#92A5A9
oklch(70.8% 0.022 211.8)
-
Step 500
500
#778E94
oklch(63.1% 0.028 215.3)
-
Step 600
600
#5F787E
oklch(55.5% 0.031 214)
-
Step 700
700 (this color)
#51686D
oklch(50.1% 0.028 212.4)
-
Step 800
800
#405357
oklch(42.8% 0.024 211.9)
-
Step 900
900
#374447
oklch(37.6% 0.018 213.3)
-
Step 950
950
#20282A
oklch(27% 0.012 214.5)
#51686D 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) | #64666D | 0.027 |
| Deuteranopia (no green cones) | #5F626D | 0.025 |
| Tritanopia (no blue cones) | #486A69 | 0.015 |
| Achromatopsia (no color) | #646464 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51686D
#51686D
oklch(50.1% 0.028 212.4)
- #735E59
#735E59
oklch(50.1% 0.029 33.6)
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 #51686D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.014
- Dim Gray #696969 ΔE 0.035
- Metallic Blue #4F738E ΔE 0.053
- YInMn Blue #415A77 ΔE 0.057
- Dusty Grape #545775 ΔE 0.057
- Deep Turquoise #017374 ΔE 0.059
- Dark Aqua #05696B ΔE 0.059
- Battleship Gray #6C757D ΔE 0.059
Use #51686D 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.