#555D9B
Closest named color: Dusky Blue (#475F94). oklch(50% 0.099 276.6), rgb(85, 93, 155).
Aa
White text reads best on this color (6.13:1).
About this color
#555D9B is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.099 and its hue 277°. 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 6.13:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.099) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.42:1 |
| White text | 6.13:1 |
Values
| HEX | #555D9B |
| RGB | rgb(85, 93, 155) |
| HSL | hsl(233, 29%, 47%) |
| OKLCH | oklch(50% 0.099 276.6) |
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 #555D9B | 6.13:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #555D9B | 3.42:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #555D9B text on white | 6.13:1 | AA | Lc 80.5 | Fine for body text |
| #555D9B 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
#F4F5FA
oklch(97.1% 0.007 277.2)
-
Step 100
100
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B8BFE0
oklch(81% 0.047 275.9)
-
Step 400
400
#949DD1
oklch(70.8% 0.077 276.6)
-
Step 500
500
#7A84C4
oklch(63.1% 0.097 276.5)
-
Step 600
600
#636DB1
oklch(55.7% 0.106 276.1)
-
Step 700
700 (this color)
#555D9B
oklch(50% 0.099 276.6)
-
Step 800
800
#444A7B
oklch(42.7% 0.081 277.1)
-
Step 900
900
#393E63
oklch(37.7% 0.064 277)
-
Step 950
950
#21253A
oklch(27.1% 0.04 275.2)
#555D9B 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) | #46659D | 0.027 |
| Deuteranopia (no green cones) | #415F9A | 0.026 |
| Tritanopia (no blue cones) | #3D6A74 | 0.089 |
| Achromatopsia (no color) | #626262 | 0.099 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555D9B
#555D9B
oklch(50% 0.099 276.6)
- #74630C
#74630C
oklch(50.1% 0.099 96.7)
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 #555D9B, 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 Blue #3B5B92 ΔE 0.038
- Twilight #4E518B ΔE 0.041
- French Blue #436BAD ΔE 0.045
- Denim #3B638C ΔE 0.046
- Dusk #4E5481 ΔE 0.047
- Light Navy Blue #2E5A88 ΔE 0.059
- Muted Blue #3B719F ΔE 0.060
Use #555D9B 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.