#51656E
Closest named color: Slate (#516572). oklch(49.4% 0.028 227), rgb(81, 101, 110).
Aa
White text reads best on this color (6.11:1).
About this color
#51656E is a medium-dark close to neutral grey. In OKLCH its lightness is 49%, its chroma 0.028. 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 6.11:1.
| Hue family | Neutrals |
| Lightness | medium-dark (49%) |
| Chroma | close to neutral grey (0.028) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.43:1 |
| White text | 6.11:1 |
Values
| HEX | #51656E |
| RGB | rgb(81, 101, 110) |
| HSL | hsl(199, 15%, 37%) |
| OKLCH | oklch(49.4% 0.028 227) |
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 #51656E | 6.11:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #51656E | 3.43:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #51656E text on white | 6.11:1 | AA | Lc 80.5 | Fine for body text |
| #51656E text on black | 3.43:1 | AA large text | Lc -21.3 | 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
#D4DADD
oklch(88.5% 0.008 228.9)
-
Step 300
300
#B8C3C7
oklch(81% 0.013 221.5)
-
Step 400
400
#93A4AB
oklch(70.8% 0.022 224.4)
-
Step 500
500
#788D97
oklch(63% 0.028 228.2)
-
Step 600
600
#617781
oklch(55.5% 0.03 227.2)
-
Step 700
700 (this color)
#51656E
oklch(49.4% 0.028 227)
-
Step 800
800
#425259
oklch(42.8% 0.023 226.3)
-
Step 900
900
#384449
oklch(37.8% 0.018 225)
-
Step 950
950
#21282B
oklch(27.1% 0.011 225.5)
#51656E 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) | #60646F | 0.022 |
| Deuteranopia (no green cones) | #5C606E | 0.021 |
| Tritanopia (no blue cones) | #486868 | 0.019 |
| Achromatopsia (no color) | #626262 | 0.028 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51656E
#51656E
oklch(49.4% 0.028 227)
- #705D54
#705D54
oklch(49.4% 0.029 46.8)
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 #51656E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.007
- Dim Gray #696969 ΔE 0.039
- YInMn Blue #415A77 ΔE 0.048
- Dusty Grape #545775 ΔE 0.048
- Denim #3B638C ΔE 0.056
- Metallic Blue #4F738E ΔE 0.056
- Dark Aqua #05696B ΔE 0.060
- Deep Turquoise #017374 ΔE 0.064
Use #51656E 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.