#51687C
Closest named color: Slate (#516572). oklch(50.7% 0.042 245), rgb(81, 104, 124).
Aa
White text reads best on this color (5.79:1).
About this color
#51687C is a medium-dark, muted blue. In OKLCH its lightness is 51%, its chroma 0.042 and its hue 245°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.016 away. White text reads best on it, at 5.79:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | muted (0.042) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.62:1 |
| White text | 5.79:1 |
Values
| HEX | #51687C |
| RGB | rgb(81, 104, 124) |
| HSL | hsl(208, 21%, 40%) |
| OKLCH | oklch(50.7% 0.042 245) |
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 #51687C | 5.79:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #51687C | 3.62:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #51687C text on white | 5.79:1 | AA | Lc 79.0 | Fine for body text |
| #51687C text on black | 3.62:1 | AA large text | Lc -22.8 | 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
#F4F6F7
oklch(97.2% 0.003 228.8)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D3DAE0
oklch(88.5% 0.011 243.7)
-
Step 300
300
#B6C2CD
oklch(80.8% 0.02 245.7)
-
Step 400
400
#90A3B4
oklch(70.6% 0.033 245.3)
-
Step 500
500
#758DA2
oklch(63.2% 0.042 244.9)
-
Step 600
600
#5D778D
oklch(55.7% 0.046 244.3)
-
Step 700
700 (this color)
#51687C
oklch(50.7% 0.042 245)
-
Step 800
800
#3F5161
oklch(42.6% 0.035 245.6)
-
Step 900
900
#36434F
oklch(37.6% 0.027 246.4)
-
Step 950
950
#20272E
oklch(26.9% 0.016 248.4)
#51687C 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) | #60687D | 0.021 |
| Deuteranopia (no green cones) | #5A637C | 0.018 |
| Tritanopia (no blue cones) | #436D6E | 0.036 |
| Achromatopsia (no color) | #656565 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51687C
#51687C
oklch(50.7% 0.042 245)
- #76604C
#76604C
oklch(50.5% 0.042 63.9)
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 #51687C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.016
- Metallic Blue #4F738E ΔE 0.037
- Denim #3B638C ΔE 0.042
- Dim Gray #696969 ΔE 0.045
- Dusty Grape #545775 ΔE 0.049
- YInMn Blue #415A77 ΔE 0.049
- Dull Blue #49759C ΔE 0.054
- Dusky Blue #475F94 ΔE 0.055
Use #51687C 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.