#555C99
Closest named color: Dusky Blue (#475F94). oklch(49.7% 0.097 277.3), rgb(85, 92, 153).
Aa
White text reads best on this color (6.21:1).
About this color
#555C99 is a medium-dark, moderately saturated blue. In OKLCH its lightness is 50%, its chroma 0.097 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.022 away. White text reads best on it, at 6.21:1.
| Hue family | Blues |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.097) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.37:1 |
| White text | 6.21:1 |
Values
| HEX | #555C99 |
| RGB | rgb(85, 92, 153) |
| HSL | hsl(234, 29%, 47%) |
| OKLCH | oklch(49.7% 0.097 277.3) |
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 #555C99 | 6.21:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #555C99 | 3.37:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #555C99 text on white | 6.21:1 | AA | Lc 80.9 | Fine for body text |
| #555C99 text on black | 3.37:1 | 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
#E7E9F3
oklch(93.5% 0.014 277.1)
-
Step 200
200
#D4D8EB
oklch(88.5% 0.026 276.4)
-
Step 300
300
#B8BEE0
oklch(80.8% 0.048 277.4)
-
Step 400
400
#949DD0
oklch(70.8% 0.075 276.5)
-
Step 500
500
#7B84C3
oklch(63.2% 0.095 277.1)
-
Step 600
600
#646CB0
oklch(55.5% 0.106 277.3)
-
Step 700
700 (this color)
#555C99
oklch(49.7% 0.097 277.3)
-
Step 800
800
#444A7B
oklch(42.7% 0.081 277.1)
-
Step 900
900
#393E63
oklch(37.7% 0.064 277)
-
Step 950
950
#22253A
oklch(27.2% 0.039 277.2)
#555C99 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) | #46649B | 0.027 |
| Deuteranopia (no green cones) | #415E98 | 0.026 |
| Tritanopia (no blue cones) | #3E6873 | 0.085 |
| Achromatopsia (no color) | #616161 | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555C99
#555C99
oklch(49.7% 0.097 277.3)
- #72620E
#72620E
oklch(49.7% 0.097 97.2)
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 #555C99, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.022
- Denim Blue #3B5B92 ΔE 0.037
- Twilight #4E518B ΔE 0.038
- Dusk #4E5481 ΔE 0.043
- Denim #3B638C ΔE 0.045
- French Blue #436BAD ΔE 0.049
- Light Navy Blue #2E5A88 ΔE 0.057
- Dusty Grape #545775 ΔE 0.058
Use #555C99 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.