#555F8D
Closest named color: Dusky Blue (#475F94). oklch(49.7% 0.075 274), rgb(85, 95, 141).
Aa
White text reads best on this color (6.16:1).
About this color
#555F8D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.075 and its hue 274°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.021 away. White text reads best on it, at 6.16:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.075) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.40:1 |
| White text | 6.16:1 |
Values
| HEX | #555F8D |
| RGB | rgb(85, 95, 141) |
| HSL | hsl(229, 25%, 44%) |
| OKLCH | oklch(49.7% 0.075 274) |
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 #555F8D | 6.16:1 | AA | Lc -85.9 | Fine for body text |
| Black text on #555F8D | 3.40:1 | AA large text | Lc 23.4 | Dividers and decoration only |
| #555F8D text on white | 6.16:1 | AA | Lc 80.7 | Fine for body text |
| #555F8D text on black | 3.40:1 | AA large text | Lc -21.1 | 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
#E7E9F1
oklch(93.5% 0.011 274.9)
-
Step 200
200
#D5D8E7
oklch(88.4% 0.021 276.9)
-
Step 300
300
#B9BFD9
oklch(80.8% 0.037 275.2)
-
Step 400
400
#959FC5
oklch(70.8% 0.057 273.4)
-
Step 500
500
#7B86B7
oklch(63% 0.075 274.3)
-
Step 600
600
#6570A3
oklch(55.7% 0.08 274.2)
-
Step 700
700 (this color)
#555F8D
oklch(49.7% 0.075 274)
-
Step 800
800
#444C71
oklch(42.6% 0.062 274.1)
-
Step 900
900
#39405B
oklch(37.7% 0.047 272.8)
-
Step 950
950
#222536
oklch(27% 0.032 276.3)
#555F8D 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) | #50648F | 0.015 |
| Deuteranopia (no green cones) | #4B5F8C | 0.014 |
| Tritanopia (no blue cones) | #446870 | 0.066 |
| Achromatopsia (no color) | #616161 | 0.075 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555F8D
#555F8D
oklch(49.7% 0.075 274)
- #70622C
#70622C
oklch(49.8% 0.075 95)
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 #555F8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.021
- Denim #3B638C ΔE 0.033
- Dusk #4E5481 ΔE 0.036
- Denim Blue #3B5B92 ΔE 0.038
- Dusty Grape #545775 ΔE 0.041
- Twilight #4E518B ΔE 0.042
- YInMn Blue #415A77 ΔE 0.048
- Light Navy Blue #2E5A88 ΔE 0.052
Use #555F8D 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.