#51584E
Closest named color: Dark Slate Gray (#2F4F4F). oklch(45.1% 0.018 136.2), rgb(81, 88, 78).
Aa
White text reads best on this color (7.35:1).
About this color
#51584E is a medium-dark close to neutral grey. In OKLCH its lightness is 45%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Dark Slate Gray (#2F4F4F), ΔE 0.058 away. White text reads best on it, at 7.35:1.
| Hue family | Neutrals |
| Lightness | medium-dark (45%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Dark Slate Gray (#2F4F4F) |
| Black text | 2.85:1 |
| White text | 7.35:1 |
Values
| HEX | #51584E |
| RGB | rgb(81, 88, 78) |
| HSL | hsl(102, 6%, 33%) |
| OKLCH | oklch(45.1% 0.018 136.2) |
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 #51584E | 7.35:1 | AAA | Lc -90.4 | Preferred for body text |
| Black text on #51584E | 2.85:1 | Fails | Lc 18.4 | Dividers and decoration only |
| #51584E text on white | 7.35:1 | AAA | Lc 85.6 | Fine for body text |
| #51584E text on black | 2.85:1 | Fails | Lc -16.5 | 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 800.
-
Step 50
50
#F5F6F5
oklch(97.2% 0.002 145.6)
-
Step 100
100
#E9EAE8
oklch(93.6% 0.003 128.5)
-
Step 200
200
#D7DAD6
oklch(88.5% 0.006 137.8)
-
Step 300
300
#BDC2BB
oklch(80.8% 0.011 136.6)
-
Step 400
400
#9CA399
oklch(70.7% 0.016 136.1)
-
Step 500
500
#848D80
oklch(63.2% 0.022 135.9)
-
Step 600
600
#6D7769
oklch(55.7% 0.024 136.7)
-
Step 700
700
#5B6457
oklch(49.1% 0.023 135.9)
-
Step 800
800 (this color)
#51584E
oklch(45.1% 0.018 136.2)
-
Step 900
900
#3E433C
oklch(37.6% 0.013 136.6)
-
Step 950
950
#242723
oklch(26.8% 0.008 137.8)
#51584E 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) | #59564D | 0.013 |
| Deuteranopia (no green cones) | #58564E | 0.012 |
| Tritanopia (no blue cones) | #515755 | 0.013 |
| Achromatopsia (no color) | #565656 | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51584E
#51584E
oklch(45.1% 0.018 136.2)
- #5A535D
#5A535D
oklch(45.3% 0.018 315.9)
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 #51584E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Slate Gray #2F4F4F ΔE 0.058
- Dark Green Blue #1F6357 ΔE 0.058
- Slate #516572 ΔE 0.059
- Dusty Grape #545775 ΔE 0.066
- YInMn Blue #415A77 ΔE 0.067
- Pine #2B5D34 ΔE 0.071
- Dim Gray #696969 ΔE 0.072
- Petrol #005F6A ΔE 0.073
Use #51584E 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.