#51617C
Closest named color: Slate (#516572). oklch(49% 0.048 260.8), rgb(81, 97, 124).
Aa
White text reads best on this color (6.26:1).
About this color
#51617C is a medium-dark, muted blue. In OKLCH its lightness is 49%, its chroma 0.048 and its hue 261°. Its hue sits on the cool side of the wheel. The nearest named color is Slate (#516572), ΔE 0.023 away. White text reads best on it, at 6.26:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | muted (0.048) |
| Temperature | cool |
| Nearest name | Slate (#516572) |
| Black text | 3.35:1 |
| White text | 6.26:1 |
Values
| HEX | #51617C |
| RGB | rgb(81, 97, 124) |
| HSL | hsl(218, 21%, 40%) |
| OKLCH | oklch(49% 0.048 260.8) |
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 #51617C | 6.26:1 | AA | Lc -86.3 | Fine for body text |
| Black text on #51617C | 3.35:1 | AA large text | Lc 22.8 | Dividers and decoration only |
| #51617C text on white | 6.26:1 | AA | Lc 81.2 | Fine for body text |
| #51617C text on black | 3.35:1 | AA large text | Lc -20.7 | 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
#F4F5F7
oklch(97% 0.003 264.5)
-
Step 100
100
#E7EAEE
oklch(93.6% 0.006 255.5)
-
Step 200
200
#D4D9E2
oklch(88.4% 0.013 262.4)
-
Step 300
300
#B8C1D0
oklch(80.9% 0.023 260.7)
-
Step 400
400
#94A1B8
oklch(70.6% 0.037 261.9)
-
Step 500
500
#798AA7
oklch(63% 0.048 261.1)
-
Step 600
600
#627492
oklch(55.6% 0.052 260.5)
-
Step 700
700 (this color)
#51617C
oklch(49% 0.048 260.8)
-
Step 800
800
#434F65
oklch(42.6% 0.04 262.4)
-
Step 900
900
#384252
oklch(37.7% 0.031 259.7)
-
Step 950
950
#212730
oklch(27.1% 0.019 258.4)
#51617C 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) | #58627D | 0.011 |
| Deuteranopia (no green cones) | #535E7B | 0.009 |
| Tritanopia (no blue cones) | #44676A | 0.043 |
| Achromatopsia (no color) | #606060 | 0.048 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51617C
#51617C
oklch(49% 0.048 260.8)
- #6F5E41
#6F5E41
oklch(49.1% 0.048 80.6)
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 #51617C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.023
- Dusty Grape #545775 ΔE 0.029
- YInMn Blue #415A77 ΔE 0.032
- Denim #3B638C ΔE 0.034
- Dusk #4E5481 ΔE 0.043
- Dusky Blue #475F94 ΔE 0.043
- Denim Blue #3B5B92 ΔE 0.052
- Metallic Blue #4F738E ΔE 0.053
Use #51617C 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.