#55639B
Closest named color: Dusky Blue (#475F94). oklch(51.3% 0.091 272.2), rgb(85, 99, 155).
Aa
White text reads best on this color (5.76:1).
About this color
#55639B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 51%, its chroma 0.091 and its hue 272°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.025 away. White text reads best on it, at 5.76:1.
| Hue family | Blues |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.091) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.64:1 |
| White text | 5.76:1 |
Values
| HEX | #55639B |
| RGB | rgb(85, 99, 155) |
| HSL | hsl(228, 29%, 47%) |
| OKLCH | oklch(51.3% 0.091 272.2) |
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 #55639B | 5.76:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #55639B | 3.64:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #55639B text on white | 5.76:1 | AA | Lc 78.8 | Fine for body text |
| #55639B text on black | 3.64:1 | AA large text | Lc -23.0 | 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
#F4F5F9
oklch(97.1% 0.005 275)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D3D9EA
oklch(88.6% 0.024 270.3)
-
Step 300
300
#B6C0DE
oklch(81% 0.044 270.8)
-
Step 400
400
#919ECD
oklch(70.6% 0.071 272.5)
-
Step 500
500
#7786C0
oklch(63.1% 0.089 272.5)
-
Step 600
600
#606FAC
oklch(55.6% 0.097 272.4)
-
Step 700
700 (this color)
#55639B
oklch(51.3% 0.091 272.2)
-
Step 800
800
#414C78
oklch(42.7% 0.075 272.2)
-
Step 900
900
#373F61
oklch(37.6% 0.059 273.1)
-
Step 950
950
#202539
oklch(26.9% 0.038 272.9)
#55639B 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) | #4F699D | 0.017 |
| Deuteranopia (no green cones) | #49639A | 0.016 |
| Tritanopia (no blue cones) | #3C6E78 | 0.080 |
| Achromatopsia (no color) | #666666 | 0.091 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #55639B
#55639B
oklch(51.3% 0.091 272.2)
- #79651F
#79651F
oklch(51.3% 0.091 92.7)
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 #55639B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.025
- French Blue #436BAD ΔE 0.036
- Denim #3B638C ΔE 0.042
- Denim Blue #3B5B92 ΔE 0.045
- Muted Blue #3B719F ΔE 0.045
- Flat Blue #3C73A8 ΔE 0.049
- Dull Blue #49759C ΔE 0.052
- Twilight #4E518B ΔE 0.055
Use #55639B 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.