#555B9D
Closest named color: Dusky Blue (#475F94). oklch(49.7% 0.105 277.9), rgb(85, 91, 157).
Aa
White text reads best on this color (6.23:1).
About this color
#555B9D is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.105 and its hue 278°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.027 away. White text reads best on it, at 6.23:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.105) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.36:1 |
| White text | 6.23:1 |
Values
| HEX | #555B9D |
| RGB | rgb(85, 91, 157) |
| HSL | hsl(235, 30%, 47%) |
| OKLCH | oklch(49.7% 0.105 277.9) |
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 #555B9D | 6.23:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #555B9D | 3.36:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #555B9D text on white | 6.23:1 | AA | Lc 81.0 | Fine for body text |
| #555B9D text on black | 3.36:1 | AA large text | Lc -20.9 | 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
#E7E9F4
oklch(93.6% 0.015 277.8)
-
Step 200
200
#D4D8EC
oklch(88.5% 0.028 276.8)
-
Step 300
300
#B8BEE2
oklch(80.9% 0.051 277.7)
-
Step 400
400
#949CD3
oklch(70.7% 0.081 277.7)
-
Step 500
500
#7B83C8
oklch(63.2% 0.104 277.9)
-
Step 600
600
#646BB4
oklch(55.5% 0.113 277.9)
-
Step 700
700 (this color)
#555B9D
oklch(49.7% 0.105 277.9)
-
Step 800
800
#44497E
oklch(42.7% 0.088 277.9)
-
Step 900
900
#393E65
oklch(37.8% 0.067 277.1)
-
Step 950
950
#21243B
oklch(26.9% 0.043 277.4)
#555B9D 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) | #4264A0 | 0.032 |
| Deuteranopia (no green cones) | #3D5E9B | 0.031 |
| Tritanopia (no blue cones) | #3C6974 | 0.093 |
| Achromatopsia (no color) | #616161 | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555B9D
#555B9D
oklch(49.7% 0.105 277.9)
- #726200
#726200
oklch(49.7% 0.103 98)
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 #555B9D, closest first.
No curated palette has a color within ΔE 0.04 of #555B9D.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.027
- Twilight #4E518B ΔE 0.039
- Denim Blue #3B5B92 ΔE 0.039
- Dusk #4E5481 ΔE 0.048
- French Blue #436BAD ΔE 0.048
- Denim #3B638C ΔE 0.051
- Light Navy Blue #2E5A88 ΔE 0.061
- Mid Blue #276AB3 ΔE 0.062
Use #555B9D 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.