#555C8F
Closest named color: Dusky Blue (#475F94). oklch(49.1% 0.082 277), rgb(85, 92, 143).
Aa
White text reads best on this color (6.33:1).
About this color
#555C8F is a medium-dark, moderately saturated blue. In OKLCH its lightness is 49%, its chroma 0.082 and its hue 277°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.020 away. White text reads best on it, at 6.33:1.
| Hue family | Blues |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.082) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.31:1 |
| White text | 6.33:1 |
Values
| HEX | #555C8F |
| RGB | rgb(85, 92, 143) |
| HSL | hsl(233, 25%, 45%) |
| OKLCH | oklch(49.1% 0.082 277) |
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 #555C8F | 6.33:1 | AA | Lc -86.6 | Fine for body text |
| Black text on #555C8F | 3.31:1 | AA large text | Lc 22.6 | Dividers and decoration only |
| #555C8F text on white | 6.33:1 | AA | Lc 81.5 | Fine for body text |
| #555C8F text on black | 3.31:1 | AA large text | Lc -20.4 | 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
#E8E9F2
oklch(93.6% 0.012 281.1)
-
Step 200
200
#D5D8E8
oklch(88.5% 0.022 277.5)
-
Step 300
300
#BABFDB
oklch(81% 0.04 277.5)
-
Step 400
400
#969EC9
oklch(70.8% 0.064 276.4)
-
Step 500
500
#7D85BB
oklch(63.1% 0.082 277.3)
-
Step 600
600
#666EA7
oklch(55.6% 0.089 277)
-
Step 700
700 (this color)
#555C8F
oklch(49.1% 0.082 277)
-
Step 800
800
#454B74
oklch(42.6% 0.068 276.7)
-
Step 900
900
#3A3F5E
oklch(37.7% 0.053 276.5)
-
Step 950
950
#222537
oklch(27% 0.034 276.6)
#555C8F 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) | #4B6291 | 0.020 |
| Deuteranopia (no green cones) | #475D8E | 0.019 |
| Tritanopia (no blue cones) | #43666F | 0.072 |
| Achromatopsia (no color) | #5F5F5F | 0.082 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #555C8F
#555C8F
oklch(49.1% 0.082 277)
- #6E6123
#6E6123
oklch(49.2% 0.083 97.4)
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 #555C8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.020
- Dusk #4E5481 ΔE 0.032
- Twilight #4E518B ΔE 0.034
- Denim Blue #3B5B92 ΔE 0.035
- Denim #3B638C ΔE 0.038
- Dusty Grape #545775 ΔE 0.042
- YInMn Blue #415A77 ΔE 0.050
- Light Navy Blue #2E5A88 ΔE 0.051
Use #555C8F 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.