#51618A
Closest named color: Dusky Blue (#475F94). oklch(49.7% 0.069 267.5), rgb(81, 97, 138).
Aa
White text reads best on this color (6.12:1).
About this color
#51618A is a medium-dark, muted blue. In OKLCH its lightness is 50%, its chroma 0.069 and its hue 268°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.023 away. White text reads best on it, at 6.12:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.069) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.42:1 |
| White text | 6.12:1 |
Values
| HEX | #51618A |
| RGB | rgb(81, 97, 138) |
| HSL | hsl(223, 26%, 43%) |
| OKLCH | oklch(49.7% 0.069 267.5) |
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 #51618A | 6.12:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #51618A | 3.42:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #51618A text on white | 6.12:1 | AA | Lc 80.5 | Fine for body text |
| #51618A text on black | 3.42:1 | 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
#F4F5F8
oklch(97% 0.004 271.4)
-
Step 100
100
#E7EAF0
oklch(93.6% 0.009 264.5)
-
Step 200
200
#D4D9E6
oklch(88.5% 0.019 269.1)
-
Step 300
300
#B7C0D7
oklch(80.8% 0.034 268.6)
-
Step 400
400
#92A0C3
oklch(70.7% 0.054 267.9)
-
Step 500
500
#7788B3
oklch(63% 0.068 267.7)
-
Step 600
600
#60729F
oklch(55.6% 0.074 267.2)
-
Step 700
700 (this color)
#51618A
oklch(49.7% 0.069 267.5)
-
Step 800
800
#414E6F
oklch(42.7% 0.058 267.4)
-
Step 900
900
#37415A
oklch(37.7% 0.045 267.4)
-
Step 950
950
#202634
oklch(26.9% 0.028 266.5)
#51618A 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) | #53648C | 0.009 |
| Deuteranopia (no green cones) | #4D5F89 | 0.009 |
| Tritanopia (no blue cones) | #3E696F | 0.062 |
| Achromatopsia (no color) | #626262 | 0.069 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #51618A
#51618A
oklch(49.7% 0.069 267.5)
- #736032
#736032
oklch(49.7% 0.068 87.4)
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 #51618A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.023
- Denim #3B638C ΔE 0.026
- Denim Blue #3B5B92 ΔE 0.038
- Dusk #4E5481 ΔE 0.038
- Dusty Grape #545775 ΔE 0.039
- YInMn Blue #415A77 ΔE 0.042
- Slate #516572 ΔE 0.045
- Twilight #4E518B ΔE 0.048
Use #51618A 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.